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DHT11-Rasp
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MIT License
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Copyright (c) 2016 Zoltan Szarvas
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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# DHT11 Python library
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This simple class can be used for reading temperature and humidity values from DHT11 sensor on Raspberry Pi.
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# Installation
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To install, just run following:
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```
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pip install dht11
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```
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# Usage
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1. Instantiate the `DHT11` class with the pin number as constructor parameter.
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2. Call `read()` method, which will return `DHT11Result` object with actual values and error code.
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For example:
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```python
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import RPi.GPIO as GPIO
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import dht11
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# initialize GPIO
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GPIO.setwarnings(False)
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GPIO.setmode(GPIO.BCM)
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GPIO.cleanup()
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# read data using pin 14
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instance = dht11.DHT11(pin = 14)
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result = instance.read()
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if result.is_valid():
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print("Temperature: %-3.1f C" % result.temperature)
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print("Humidity: %-3.1f %%" % result.humidity)
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else:
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print("Error: %d" % result.error_code)
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```
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For working example, see `dht11_example.py` (you probably need to adjust pin for your configuration)
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# License
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This project is licensed under the terms of the MIT license.
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import time
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import RPi
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class DHT11Result:
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'DHT11 sensor result returned by DHT11.read() method'
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ERR_NO_ERROR = 0
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ERR_MISSING_DATA = 1
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ERR_CRC = 2
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error_code = ERR_NO_ERROR
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temperature = -1
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humidity = -1
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def __init__(self, error_code, temperature, humidity):
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self.error_code = error_code
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self.temperature = temperature
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self.humidity = humidity
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def is_valid(self):
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return self.error_code == DHT11Result.ERR_NO_ERROR
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class DHT11:
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'DHT11 sensor reader class for Raspberry'
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__pin = 0
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def __init__(self, pin):
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self.__pin = pin
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def read(self):
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RPi.GPIO.setup(self.__pin, RPi.GPIO.OUT)
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# send initial high
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self.__send_and_sleep(RPi.GPIO.HIGH, 0.05)
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# pull down to low
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self.__send_and_sleep(RPi.GPIO.LOW, 0.02)
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# change to input using pull up
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RPi.GPIO.setup(self.__pin, RPi.GPIO.IN, RPi.GPIO.PUD_UP)
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# collect data into an array
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data = self.__collect_input()
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# parse lengths of all data pull up periods
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pull_up_lengths = self.__parse_data_pull_up_lengths(data)
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# if bit count mismatch, return error (4 byte data + 1 byte checksum)
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if len(pull_up_lengths) != 40:
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return DHT11Result(DHT11Result.ERR_MISSING_DATA, 0, 0)
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# calculate bits from lengths of the pull up periods
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bits = self.__calculate_bits(pull_up_lengths)
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# we have the bits, calculate bytes
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the_bytes = self.__bits_to_bytes(bits)
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# calculate checksum and check
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checksum = self.__calculate_checksum(the_bytes)
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if the_bytes[4] != checksum:
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return DHT11Result(DHT11Result.ERR_CRC, 0, 0)
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# ok, we have valid data
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# The meaning of the return sensor values
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# the_bytes[0]: humidity int
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# the_bytes[1]: humidity decimal
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# the_bytes[2]: temperature int
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# the_bytes[3]: temperature decimal
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temperature = the_bytes[2] + float(the_bytes[3]) / 10
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humidity = the_bytes[0] + float(the_bytes[1]) / 10
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return DHT11Result(DHT11Result.ERR_NO_ERROR, temperature, humidity)
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def __send_and_sleep(self, output, sleep):
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RPi.GPIO.output(self.__pin, output)
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time.sleep(sleep)
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def __collect_input(self):
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# collect the data while unchanged found
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unchanged_count = 0
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# this is used to determine where is the end of the data
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max_unchanged_count = 100
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last = -1
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data = []
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while True:
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current = RPi.GPIO.input(self.__pin)
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data.append(current)
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if last != current:
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unchanged_count = 0
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last = current
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else:
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unchanged_count += 1
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if unchanged_count > max_unchanged_count:
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break
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return data
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def __parse_data_pull_up_lengths(self, data):
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STATE_INIT_PULL_DOWN = 1
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STATE_INIT_PULL_UP = 2
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STATE_DATA_FIRST_PULL_DOWN = 3
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STATE_DATA_PULL_UP = 4
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STATE_DATA_PULL_DOWN = 5
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state = STATE_INIT_PULL_DOWN
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lengths = [] # will contain the lengths of data pull up periods
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current_length = 0 # will contain the length of the previous period
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for i in range(len(data)):
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current = data[i]
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current_length += 1
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if state == STATE_INIT_PULL_DOWN:
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if current == RPi.GPIO.LOW:
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# ok, we got the initial pull down
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state = STATE_INIT_PULL_UP
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continue
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else:
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continue
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if state == STATE_INIT_PULL_UP:
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if current == RPi.GPIO.HIGH:
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# ok, we got the initial pull up
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state = STATE_DATA_FIRST_PULL_DOWN
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continue
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else:
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continue
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if state == STATE_DATA_FIRST_PULL_DOWN:
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if current == RPi.GPIO.LOW:
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# we have the initial pull down, the next will be the data pull up
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state = STATE_DATA_PULL_UP
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continue
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else:
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continue
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if state == STATE_DATA_PULL_UP:
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if current == RPi.GPIO.HIGH:
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# data pulled up, the length of this pull up will determine whether it is 0 or 1
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current_length = 0
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state = STATE_DATA_PULL_DOWN
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continue
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else:
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continue
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if state == STATE_DATA_PULL_DOWN:
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if current == RPi.GPIO.LOW:
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# pulled down, we store the length of the previous pull up period
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lengths.append(current_length)
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state = STATE_DATA_PULL_UP
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continue
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else:
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continue
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return lengths
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def __calculate_bits(self, pull_up_lengths):
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# find shortest and longest period
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shortest_pull_up = 1000
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longest_pull_up = 0
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for i in range(0, len(pull_up_lengths)):
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length = pull_up_lengths[i]
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if length < shortest_pull_up:
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shortest_pull_up = length
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if length > longest_pull_up:
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longest_pull_up = length
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# use the halfway to determine whether the period it is long or short
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halfway = shortest_pull_up + (longest_pull_up - shortest_pull_up) / 2
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bits = []
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for i in range(0, len(pull_up_lengths)):
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bit = False
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if pull_up_lengths[i] > halfway:
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bit = True
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bits.append(bit)
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return bits
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def __bits_to_bytes(self, bits):
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the_bytes = []
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byte = 0
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for i in range(0, len(bits)):
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byte = byte << 1
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if (bits[i]):
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byte = byte | 1
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else:
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byte = byte | 0
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if ((i + 1) % 8 == 0):
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the_bytes.append(byte)
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byte = 0
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return the_bytes
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def __calculate_checksum(self, the_bytes):
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return the_bytes[0] + the_bytes[1] + the_bytes[2] + the_bytes[3] & 255
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import RPi.GPIO as GPIO
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import dht11
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import time
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import datetime
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# initialize GPIO
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GPIO.setwarnings(True)
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GPIO.setmode(GPIO.BCM)
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# read data using pin 14
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instance = dht11.DHT11(pin=14)
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try:
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while True:
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result = instance.read()
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if result.is_valid():
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print("Last valid input: " + str(datetime.datetime.now()))
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print("Temperature: %-3.1f C" % result.temperature)
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print("Humidity: %-3.1f %%" % result.humidity)
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time.sleep(6)
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except KeyboardInterrupt:
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print("Cleanup")
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GPIO.cleanup()
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from setuptools import setup, find_packages
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with open("README.md", "r") as fh:
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long_description = fh.read()
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setup(
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name="dht11",
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version="0.1.0",
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author="Zoltán Szarvas",
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author_email="",
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description="Pure Python library for reading DHT11 sensor on Raspberry Pi",
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long_description=long_description,
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long_description_content_type="text/markdown",
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url="https://github.com/szazo/DHT11_Python",
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packages=find_packages(),
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install_requires=["RPi.GPIO"],
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classifiers=[
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"Programming Language :: Python :: 3",
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"License :: OSI Approved :: MIT License",
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"Operating System :: OS Independent",
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],
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python_requires='>=3.6',
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)
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39
README.md
39
README.md
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# DHT Humidity Sensing on Raspberry Pi
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# DHT Humidity Sensing on Raspberry Pi
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This project is a uses the basic DHT11 python library (main method) and AdaFruit libraries (alternative method) for sensing temperature using DHT11 sensor and a Raspberry Pi.
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This project is a uses the AdaFruit libraries for sensing temperature using DHT11 sensor and a Raspberry Pi.
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---
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---
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@ -10,13 +10,13 @@ This project is a uses the basic DHT11 python library (main method) and AdaFruit
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## Main method
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## Main method
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> [!NOTE]
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> [!NOTE]
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> Main method uses the `DHT11` python library for reading the sensor data.
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> This is the main method, using AdaFruit library. For an easier method, checkout [## Alternative method](https://git.kska.io/notkshitij/DHT11#alternative-method)
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> This is a pure Python library for reading DHT11 sensor on Raspberry Pi.
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1. Install prerequisites:
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1. Install some prerequisite packages:
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```shell
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```shell
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sudo apt update &&\
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sudo apt update &&\
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sudo apt install -y git
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sudo apt install git -y
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```
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```
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2. Clone the project:
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2. Clone the project:
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@ -44,31 +44,28 @@ source setup.sh
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## Alternative method
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## Alternative method
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> [!NOTE]
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> [!NOTE]
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> This is the alternative method, using **AdaFruit library**. This method has been tested on Raspberry Pi 3B. For easier setup, checkout [## Main method](https://git.kska.io/notkshitij/DHT11#main-method)
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> This alternative method uses the `DHT11` python library for reading the sensor data.
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> This is a pure Python library for reading DHT11 sensor on Raspberry Pi.
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1. Install prerequisite packages:
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1. Install prerequisites:
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```shell
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```shell
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sudo apt update &&\
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sudo apt update &&\
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sudo apt install git -y
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sudo apt upgrade -y &&\
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sudo apt install python3 python3-pip -y
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```
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```
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2. Clone the project:
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2. Setup a virtual environment & install the library:
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```shell
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```shell
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git clone https://git.kska.io/notkshitij/DHT11.git
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mkdir /home/$(whoami)/temp-sensor
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cd /home/$(whoami)/temp-sensor
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python3 -m venv .
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source bin/activate
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pip install dht11 setuptools RPi.GPIO
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```
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```
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> Alternatively, you can also [download the zip file](https://git.kska.io/notkshitij/DHT11/archive/main.zip)
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3. **Download** and **run** the code [alt-temp.py](https://git.kska.io/notkshitij/DHT11/src/branch/main/alt-temp.py)
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||||||
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3. Change the current working directory to the folder in which the project was cloned:
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```shell
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cd ./DHT11
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```
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4. Run the `ada-setup.sh` script:
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```shell
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source ada-setup.sh
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||||||
```
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||||||
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||||||
> [!IMPORTANT]
|
> [!IMPORTANT]
|
||||||
> After running the code, and completing the execution, run `deactivate` in the terminal to exit the virtual environment.
|
> After running the code, and completing the execution, run `deactivate` in the terminal to exit the virtual environment.
|
||||||
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|||||||
96
ada-setup.sh
96
ada-setup.sh
@ -1,96 +0,0 @@
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#!/bin/bash
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cat << "EOF"
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||||||
__| |______________________________________________________________________| |__
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||||||
__ ______________________________________________________________________ __
|
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||||||
| | | |
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||||||
| | | |
|
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||||||
| | ____ _ _ _ | |
|
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||||||
| | | _ \ ___ ___(_) __ _ _ __ ___ __| | __ _ _ __ __| | | |
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|
||||||
| | | | | |/ _ \/ __| |/ _` | '_ \ / _ \/ _` | / _` | '_ \ / _` | | |
|
|
||||||
| | | |_| | __/\__ \ | (_| | | | | __/ (_| | | (_| | | | | (_| | | |
|
|
||||||
| | |____/ \___||___/_|\__, |_| |_|\___|\__,_| \__,_|_| |_|\__,_| | |
|
|
||||||
| | |___/ | |
|
|
||||||
| | _____ _ _ _ | |
|
|
||||||
| | | ____|_ __ __ _(_)_ __ ___ ___ _ __ ___ __| | | |__ _ _ | |
|
|
||||||
| | | _| | '_ \ / _` | | '_ \ / _ \/ _ \ '__/ _ \/ _` | | '_ \| | | | | |
|
|
||||||
| | | |___| | | | (_| | | | | | __/ __/ | | __/ (_| | | |_) | |_| | | |
|
|
||||||
| | |_____|_| |_|\__, |_|_| |_|\___|\___|_| \___|\__,_| |_.__/ \__, | | |
|
|
||||||
| | |___/ |___/ | |
|
|
||||||
| | _ __ _ _ _ _ _ | |
|
|
||||||
| | | |/ /___| |__ (_) |_(_)(_) | |
|
|
||||||
| | | ' // __| '_ \| | __| || | | |
|
|
||||||
| | | . \\__ \ | | | | |_| || | | |
|
|
||||||
| | |_|\_\___/_| |_|_|\__|_|/ | | |
|
|
||||||
| | |__/ | |
|
|
||||||
| | | |
|
|
||||||
__| |______________________________________________________________________| |__
|
|
||||||
__ ______________________________________________________________________ __
|
|
||||||
| | | |
|
|
||||||
|
|
||||||
EOF
|
|
||||||
|
|
||||||
# Declaring variables
|
|
||||||
line="=================================="
|
|
||||||
|
|
||||||
# Update and upgrade packages
|
|
||||||
echo -e "$line\nUpdating and upgrading packages.\n$line\n"
|
|
||||||
sudo apt update && sudo apt upgrade -y
|
|
||||||
echo -e "$line\nFinished updating and upgrading packages.\n$line\n"
|
|
||||||
|
|
||||||
# Check if python3-pip is installed
|
|
||||||
echo -e "$line\nChecking for python3-pip.\n$line\n"
|
|
||||||
if ! dpkg -l | grep -q python3-pip; then
|
|
||||||
echo -e "$line\npython3-pip is not installed,\nInstalling python3-pip.\n$line\n"
|
|
||||||
sudo apt install python3-pip -y
|
|
||||||
else
|
|
||||||
echo -e "$line\npython3-pip already installed, moving on...\n$line\n"
|
|
||||||
fi
|
|
||||||
|
|
||||||
# Check if libgpiod2 is installed
|
|
||||||
echo -e "$line\nChecking for libgpiod2.\n$line\n"
|
|
||||||
if ! dpkg -l | grep -q libgpiod2; then
|
|
||||||
echo -e "$line\nlibgpiod2 is not installed,\nInstalling python3-setuptools.\n$line\n"
|
|
||||||
sudo apt install libgpiod2 -y
|
|
||||||
else
|
|
||||||
echo -e "$line\nlibgpiod2 already installed, moving on...\n$line\n"
|
|
||||||
fi
|
|
||||||
|
|
||||||
# Create project folder
|
|
||||||
USER=$(whoami)
|
|
||||||
PROJECT_DIR="/home/$USER/Desktop/temp-sensor"
|
|
||||||
|
|
||||||
if [ ! -d "$PROJECT_DIR" ]; then
|
|
||||||
echo -e "$line\nCreating 'temp-sensor' in Desktop directory for current user.\n$line\n"
|
|
||||||
mkdir -p "$PROJECT_DIR"
|
|
||||||
cp "./alt-temp.py" "./blinka-test.py" "$PROJECT_DIR/"
|
|
||||||
echo -e "$line\nCreated '$PROJECT_DIR' directory.\n$line\n"
|
|
||||||
else
|
|
||||||
echo -e "$line\n$PROJECT_DIR already exists.\n$line\n"
|
|
||||||
fi
|
|
||||||
|
|
||||||
# Create and activate Python virtual environment
|
|
||||||
cd "$PROJECT_DIR/"
|
|
||||||
chmod 775 ./alt-temp.py ./blinka-test.py
|
|
||||||
python3 -m venv . --system-site-packages
|
|
||||||
echo -e "$line\nVirtual environment created.\n$line\n"
|
|
||||||
echo -e "$line\nActivating virtual environment...\n$line\n"
|
|
||||||
source $PROJECT_DIR/bin/activate
|
|
||||||
|
|
||||||
echo -e "$line\nInstalling dependencies...\n$line\n"
|
|
||||||
pip3 install --upgrade setuptools click adafruit-python-shell adafruit-circuitpython-dht RPi.GPIO adafruit-blinka board
|
|
||||||
|
|
||||||
echo -e "$line\nSetting up raspiberry pi...\n$line\n"
|
|
||||||
sudo raspi-config nonint do_i2c 0
|
|
||||||
sudo raspi-config nonint do_spi 0
|
|
||||||
sudo raspi-config nonint do_serial_hw 0
|
|
||||||
sudo raspi-config nonint do_ssh 0
|
|
||||||
sudo raspi-config nonint do_camera 0
|
|
||||||
sudo raspi-config nonint disable_raspi_config_at_boot 0
|
|
||||||
sudo apt install -y i2c-tools libgpiod-dev python3-libgpiod
|
|
||||||
|
|
||||||
python3 blinka-test.py
|
|
||||||
echo -e "$line\nBlinka works!\n$line\n"
|
|
||||||
|
|
||||||
echo -e "\n\n\n$line$line$line\nSetup completed.\nExecute the command 'python3 alt-temp.py' to calculate the temperature.\n# DESIGNED AND ENGINEERED BY KSHITIJ.\n# END OF SCRIPT\n$line$line$line\n\n\n"
|
|
||||||
46
alt-temp.py
46
alt-temp.py
@ -1,35 +1,21 @@
|
|||||||
import time
|
# NOTE: GPIO PIN 16 used
|
||||||
import board
|
|
||||||
import adafruit_dht
|
|
||||||
|
|
||||||
# Initial the dht device, with data pin connected to:
|
import RPi.GPIO as GPIO
|
||||||
dhtDevice = adafruit_dht.DHT11(board.D16) # by default I'm using GPIO PIN 16 for data/signal transmission of DHT11
|
import dht11
|
||||||
|
|
||||||
# you can pass DHT22 use_pulseio=False if you wouldn't like to use pulseio.
|
# initialize GPIO
|
||||||
# This may be necessary on a Linux single board computer like the Raspberry Pi,
|
GPIO.setwarnings(False)
|
||||||
# but it will not work in CircuitPython.
|
GPIO.setmode(GPIO.BCM)
|
||||||
# dhtDevice = adafruit_dht.DHT22(board.D18, use_pulseio=False)
|
GPIO.cleanup()
|
||||||
|
|
||||||
while True:
|
# read data using pin 16
|
||||||
try:
|
instance = dht11.DHT11(pin = 16)
|
||||||
# Print the values to the serial port
|
result = instance.read()
|
||||||
temperature_c = dhtDevice.temperature # Celsius
|
|
||||||
temperature_f = temperature_c * (9 / 5) + 32 # Fahrenheit
|
|
||||||
humidity = dhtDevice.humidity
|
|
||||||
print(
|
|
||||||
"Temp: {:.1f} F / {:.1f} C Humidity: {}% ".format(
|
|
||||||
temperature_f, temperature_c, humidity
|
|
||||||
)
|
|
||||||
)
|
|
||||||
|
|
||||||
except RuntimeError as error:
|
if result.is_valid():
|
||||||
# Errors happen fairly often, DHT's are hard to read, just keep going
|
print("Temperature: %-3.1f C" % result.temperature)
|
||||||
print(error.args[0])
|
print("Humidity: %-3.1f %%" % result.humidity)
|
||||||
time.sleep(2.0)
|
else:
|
||||||
continue
|
print("Error: %d" % result.error_code)
|
||||||
except Exception as error:
|
|
||||||
dhtDevice.exit()
|
|
||||||
raise error
|
|
||||||
|
|
||||||
time.sleep(2.0)
|
|
||||||
|
|
||||||
|
GPIO.cleanup()
|
||||||
|
|||||||
43
setup.sh
43
setup.sh
@ -48,35 +48,50 @@ else
|
|||||||
echo -e "$line\npython3-pip already installed, moving on...\n$line\n"
|
echo -e "$line\npython3-pip already installed, moving on...\n$line\n"
|
||||||
fi
|
fi
|
||||||
|
|
||||||
|
# Check if libgpiod2 is installed
|
||||||
|
echo -e "$line\nChecking for libgpiod2.\n$line\n"
|
||||||
|
if ! dpkg -l | grep -q libgpiod2; then
|
||||||
|
echo -e "$line\nlibgpiod2 is not installed,\nInstalling python3-setuptools.\n$line\n"
|
||||||
|
sudo apt install libgpiod2 -y
|
||||||
|
else
|
||||||
|
echo -e "$line\nlibgpiod2 already installed, moving on...\n$line\n"
|
||||||
|
fi
|
||||||
|
|
||||||
# Create project folder
|
# Create project folder
|
||||||
USER=$(whoami)
|
USER=$(whoami)
|
||||||
PROJECT_DIR="/home/$USER/Desktop/dht11-sensor"
|
PROJECT_DIR="/home/$USER/Desktop/temp-sensor"
|
||||||
|
|
||||||
if [ ! -d "$PROJECT_DIR" ]; then
|
if [ ! -d "$PROJECT_DIR" ]; then
|
||||||
echo -e "$line\nCreating 'dht11-sensor' in Desktop directory for current user.\n$line\n"
|
echo -e "$line\nCreating 'temp-sensor' in Desktop directory for current user.\n$line\n"
|
||||||
mkdir -p "$PROJECT_DIR"
|
mkdir -p "$PROJECT_DIR"
|
||||||
cp "./temp-calc.py" "$PROJECT_DIR/"
|
cp "./temp-calc.py" "./blinka-test.py" "$PROJECT_DIR/"
|
||||||
cp -r "./DHT11_Python/" "$PROJECT_DIR/DHT11_Python"
|
|
||||||
echo -e "$line\nCreated '$PROJECT_DIR' directory.\n$line\n"
|
echo -e "$line\nCreated '$PROJECT_DIR' directory.\n$line\n"
|
||||||
else
|
else
|
||||||
echo -e "$line\n$PROJECT_DIR already exists.\n$line\n"
|
echo -e "$line\n$PROJECT_DIR already exists. Please delete the folder before running this script.\n$line\n\nExiting..."
|
||||||
|
exit 1
|
||||||
fi
|
fi
|
||||||
|
|
||||||
# Create and activate Python virtual environment
|
# Create and activate Python virtual environment
|
||||||
cd "$PROJECT_DIR/"
|
cd "$PROJECT_DIR/"
|
||||||
chmod 775 ./temp-calc.py
|
chmod 775 ./temp-calc.py ./blinka-test.py
|
||||||
python3 -m venv .
|
python3 -m venv . --system-site-packages
|
||||||
echo -e "$line\nVirtual environment created.\n$line\n"
|
echo -e "$line\nVirtual environment created.\n$line\n"
|
||||||
echo -e "$line\nActivating virtual environment...\n$line\n"
|
echo -e "$line\nActivating virtual environment...\n$line\n"
|
||||||
source $PROJECT_DIR/bin/activate
|
source $PROJECT_DIR/bin/activate
|
||||||
|
|
||||||
echo -e "$line\nInstalling dependencies...\n$line\n"
|
echo -e "$line\nInstalling dependencies...\n$line\n"
|
||||||
pip install --upgrade RPi.GPIO setuptools
|
pip3 install --upgrade setuptools click adafruit-python-shell adafruit-circuitpython-dht RPi.GPIO adafruit-blinka board
|
||||||
# Alternatively, instead of executing the next four lines, you can also run "pip install dht11"
|
|
||||||
# but I've decided to keep the files for "dht11" package locally available for installation in the script.
|
echo -e "$line\nSetting up raspiberry pi...\n$line\n"
|
||||||
cd "$PROJECT_DIR/DHT11_Python"
|
sudo raspi-config nonint do_i2c 0
|
||||||
pip install .
|
sudo raspi-config nonint do_spi 0
|
||||||
pip show dht11
|
sudo raspi-config nonint do_serial_hw 0
|
||||||
cd "$PROJECT_DIR/"
|
sudo raspi-config nonint do_ssh 0
|
||||||
|
sudo raspi-config nonint do_camera 0
|
||||||
|
sudo raspi-config nonint disable_raspi_config_at_boot 0
|
||||||
|
sudo apt install -y i2c-tools libgpiod-dev python3-libgpiod
|
||||||
|
|
||||||
|
python3 blinka-test.py
|
||||||
|
echo -e "$line\nBlinka works!\n$line\n"
|
||||||
|
|
||||||
echo -e "\n\n\n$line$line$line\nSetup completed.\nExecute the command 'python3 temp-calc.py' to calculate the temperature.\n# DESIGNED AND ENGINEERED BY KSHITIJ.\n# END OF SCRIPT\n$line$line$line\n\n\n"
|
echo -e "\n\n\n$line$line$line\nSetup completed.\nExecute the command 'python3 temp-calc.py' to calculate the temperature.\n# DESIGNED AND ENGINEERED BY KSHITIJ.\n# END OF SCRIPT\n$line$line$line\n\n\n"
|
||||||
|
|||||||
51
temp-calc.py
51
temp-calc.py
@ -1,26 +1,35 @@
|
|||||||
# NOTE: GPIO PIN 16 used
|
|
||||||
|
|
||||||
import RPi.GPIO as GPIO
|
|
||||||
import dht11
|
|
||||||
import time
|
import time
|
||||||
|
import board
|
||||||
|
import adafruit_dht
|
||||||
|
|
||||||
# initialize GPIO
|
# Initial the dht device, with data pin connected to:
|
||||||
GPIO.setwarnings(False)
|
dhtDevice = adafruit_dht.DHT11(board.D16) # by default I'm using GPIO PIN 16 for data/signal transmission of DHT11
|
||||||
GPIO.setmode(GPIO.BCM)
|
|
||||||
GPIO.cleanup()
|
# you can pass DHT22 use_pulseio=False if you wouldn't like to use pulseio.
|
||||||
|
# This may be necessary on a Linux single board computer like the Raspberry Pi,
|
||||||
|
# but it will not work in CircuitPython.
|
||||||
|
# dhtDevice = adafruit_dht.DHT22(board.D18, use_pulseio=False)
|
||||||
|
|
||||||
try:
|
|
||||||
while True:
|
while True:
|
||||||
# read data using pin 16
|
try:
|
||||||
instance = dht11.DHT11(pin = 16)
|
# Print the values to the serial port
|
||||||
result = instance.read()
|
temperature_c = dhtDevice.temperature # Celsius
|
||||||
|
temperature_f = temperature_c * (9 / 5) + 32 # Fahrenheit
|
||||||
|
humidity = dhtDevice.humidity
|
||||||
|
print(
|
||||||
|
"Temp: {:.1f} F / {:.1f} C Humidity: {}% ".format(
|
||||||
|
temperature_f, temperature_c, humidity
|
||||||
|
)
|
||||||
|
)
|
||||||
|
|
||||||
|
except RuntimeError as error:
|
||||||
|
# Errors happen fairly often, DHT's are hard to read, just keep going
|
||||||
|
print(error.args[0])
|
||||||
|
time.sleep(2.0)
|
||||||
|
continue
|
||||||
|
except Exception as error:
|
||||||
|
dhtDevice.exit()
|
||||||
|
raise error
|
||||||
|
|
||||||
|
time.sleep(2.0)
|
||||||
|
|
||||||
if result.is_valid():
|
|
||||||
print("Temperature: %-3.1f C" % result.temperature)
|
|
||||||
print("Humidity: %-3.1f %%" % result.humidity)
|
|
||||||
else:
|
|
||||||
print("Error: %d" % result.error_code)
|
|
||||||
time.sleep(3)
|
|
||||||
except KeyboardInterrupt:
|
|
||||||
print("Program stopped by user.")
|
|
||||||
GPIO.cleanup()
|
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user