Smart light – working with digital sensor

After writing our first C/C++ program for Raspberry Pi, we can now write a program that will take input from an LDR sensor and turn the LED on or off. For this project, you will need the following hardware components:

• 1 LDR sensor module
• 1 LED
• Raspberry Pi
• 5 female-to-female connecting wires

First, let's explore how the LDR sensor works.

The LDR sensor and the way it works

An LDR sensor is an analog input sensor that consists of a variable resistor whose resistance varies depending on the amount of light falling on its surface. When there is no light in the room, the resistance of the LDR sensor is HIGH (up to 1 M ohm) and in the presence of light, the resistance of the...