grandpa, i think this type of cheap sensor wont give you accurate reading. as it fluctuate with temperature and humidity. and as it reacts to multiple gasses, you wont be able to differentiate it from the rest. good day

Thanks for your support.

The same - like on rpi3

I didn't get what you mean?

I have 2 types of scripts I used in this video. Script A - Using AO and Analog to Digital Converter (ADC) Script B - Using DO directly from the MQ sensor which is risky due to 5v coming back to Pi Script A - I used example published on github below for ADC version: github.com/adafruit/Adafruit_Python_ADS1x15/blob/master/examples/simpletest.py Script B - I have simple script below (use this at your own risk): import time, sys import RPi.GPIO as GPIO GPIO.setmode(GPIO.BOARD) GPIO.setup(35, GPIO.IN, pull_up_down=GPIO.PUD_DOWN) def action(pin): print('Sensor detected') GPIO.add_event_detect(35, GPIO.RISING) GPIO.add_event_callback(35, action) try: while True: print('alive') time.sleep(0.5) except KeyboardInterrupt: GPIO.cleanup() sys.exit()

@@funincomplete977 good day sir, do you have the schematic for the Script A?