Alternate method is now the main method since it's much easier to setup and it's been tested in our college IoT lab.
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README.md
71
README.md
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# DHT Humidity Sensing on 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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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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---
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@ -10,9 +10,43 @@ This project is a uses the AdaFruit libraries for sensing temperature using DHT1
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## Main method
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> [!NOTE]
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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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> Main 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 some prerequisite packages:
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1. Install prerequisites:
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```shell
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sudo apt update &&\
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sudo apt install -y git
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```
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2. Clone the project:
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```shell
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git clone https://git.kska.io/notkshitij/DHT11.git
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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. 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 `setup.sh` script:
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```shell
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source setup.sh
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```
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> [!IMPORTANT]
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> After running the code, and completing the execution, run `deactivate` in the terminal to exit the virtual environment.
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---
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## Alternative method
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> [!NOTE]
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> This is the alternative method, using **AdaFruit library**. This method doesnt' seem to work on our college Raspberry Pi 3's. For easiler setup, checkout [## Main method](https://git.kska.io/notkshitij/DHT11#main-method)
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1. Install prerequisite packages:
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```shell
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sudo apt update &&\
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sudo apt install git -y
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@ -41,37 +75,6 @@ source ada-setup.sh
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---
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## Alternative method
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> [!NOTE]
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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 prerequisites:
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```shell
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sudo apt update &&\
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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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2. Setup a virtual environment & install the library:
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```shell
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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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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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> [!IMPORTANT]
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> After running the code, and completing the execution, run `deactivate` in the terminal to exit the virtual environment.
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---
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### License
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This project is licensed under the terms of the MIT license. Read the license [here](https://git.kska.io/notkshitij/DHT11/src/branch/main/LICENSE.txt).
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76
setup.sh
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setup.sh
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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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| | | | | |/ _ \/ __| |/ _` | '_ \ / _ \/ _` | / _` | '_ \ / _` | | |
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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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| | | |___| | | | (_| | | | | | __/ __/ | | __/ (_| | | |_) | |_| | | |
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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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| | |_|\_\___/_| |_|_|\__|_|/ | | |
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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
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# Declaring variables
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line="=================================="
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# Update and upgrade packages
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echo -e "$line\nUpdating and upgrading packages.\n$line\n"
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sudo apt update && sudo apt upgrade -y
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echo -e "$line\nFinished updating and upgrading packages.\n$line\n"
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# Check if python3-pip is installed
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echo -e "$line\nChecking for python3-pip.\n$line\n"
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if ! dpkg -l | grep -q python3-pip; then
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echo -e "$line\npython3-pip is not installed,\nInstalling python3-pip.\n$line\n"
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sudo apt install python3-pip -y
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else
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echo -e "$line\npython3-pip already installed, moving on...\n$line\n"
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fi
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# Create project folder
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USER=$(whoami)
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PROJECT_DIR="/home/$USER/Desktop/dht11-sensor"
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if [ ! -d "$PROJECT_DIR" ]; then
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echo -e "$line\nCreating 'dht11-sensor' in Desktop directory for current user.\n$line\n"
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mkdir -p "$PROJECT_DIR"
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cp "./temp-calc.py" "$PROJECT_DIR/"
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echo -e "$line\nCreated '$PROJECT_DIR' directory.\n$line\n"
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else
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echo -e "$line\n$PROJECT_DIR already exists. Please delete the folder before running this script.\n$line\n\nExiting..."
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exit 1
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fi
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# Create and activate Python virtual environment
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cd "$PROJECT_DIR/"
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chmod 775 ./temp-calc.py
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python3 -m venv .
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echo -e "$line\nVirtual environment created.\n$line\n"
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echo -e "$line\nActivating virtual environment...\n$line\n"
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source $PROJECT_DIR/bin/activate
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echo -e "$line\nInstalling dependencies...\n$line\n"
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pip3 install --upgrade RPi.GPIO setuptools dht11
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echo -e "\n\n\n$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"
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21
temp-calc.py
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21
temp-calc.py
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# NOTE: GPIO PIN 16 used
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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 16
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instance = dht11.DHT11(pin = 16)
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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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GPIO.cleanup()
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