Added content.

- Notes
- Practical
- Question Papers
- DISCLAIMER and motto file
Lastly, updated README file.

Practical/Assignment-4/IoT - Code-4.py

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+"""
+THIS CODE HAS BEEN TESTED ON RASPBERRY PI 3B, 4B AND IS FULLY OPERATIONAL.
+
+Problem Statement: Temperature and humidity sensing using DHT11.
+
+Code from InternetOfThingsAndEmbeddedSystems (SPPU - Third Year - Computer Engineering - Content) repository on KSKA Git: https://git.kska.io/sppu-te-comp-content/InternetOfThingsAndEmbeddedSystems
+"""
+
+# NOTE: PLEASE REFER DHT11 repo by notkshitij for initialization: https://git.kska.io/notkshitij/DHT11/
+
+# This code will only work in the virtual environment
+# To enable the virtual environment, change current working directory using 'cd <DIR>'
+# Activate the virtual environment using 'source bin/activate'
+# Run this code 'python3 IoT\ -\ Code-4.py'
+
+# BEGINNING OF CODE
+# NOTE: GPIO PIN 16 used
+
+import RPi.GPIO as GPIO
+import dht11
+import time
+
+# initialize GPIO
+GPIO.setmode(GPIO.BCM)
+GPIO.setwarnings(False) # Set True if you are having trouble connecting the DHT11 sensor to Raspberry Pi. Doing so will show warnings on screen.
+
+try:
+  while True:
+    # read data using pin 16
+    instance = dht11.DHT11(pin = 16)
+    result = instance.read()
+
+    if result.is_valid():
+      print("Temperature: %-3.1f C" % result.temperature)
+      print("Humidity: %-3.1f %%" % result.humidity)
+    else:
+      print("Error: %d" % result.error_code)
+      # Error 1 implies sensor not detected, thus no data 
+      # Error 2 implies checksum error, data corrupted, i.e. GPIO connection might be lose
+    time.sleep(3)
+except KeyboardInterrupt:
+  print("Program stopped by user.")
+  GPIO.cleanup()
+# END OF CODE