Interfacing any resistive sensor on GPIO

Resistive sensors are devices whose resistance changes when the sensor's input is altered. A photoresistor will change based on the amount of light, and a thermistor's resistance changes with temperature. With a simple circuit, you can configure your GPIO to read changes in a resistive sensor's values.

Getting ready

For this recipe, I used a photoresistor as they are the easiest ones to change values on. Any two-lead resistive sensor will work for this recipe. You'll also need a 1uF electrolytic capacitor.

How to do it...

1. Configure the following circuit and wire it to the Raspberry Pi:
   

2. Using RPi.GPIO again, we can put together a simple program that tracks our sensor. Create photoresitor.py in the ch9 directory with the following code:

       #!/usr/bin/env python 
       # Raspberry Pi Zero Cookbook 
       # Chapter 9 - Analog Sensors 
       import RPi.GPIO as...