The amount of light reaching the LDR from the LED decreases as the pipe is bent, and with a simple divider circuit a voltage can be read by an Arduino.

He wanted to include a light sensor but the problem is, the Pi doesn’t have a built-in ADC to read the voltage off the light-dependent resistor that he (presumably) had in his junk box.

Input: an LDR detects when it gets dark. Process: a microcontroller processes the signal from the LDR. Output: the system turns on the street light LEDs.

K. Anvar Sadath, Chief Executive Officer of KITE said each Robotic Kit deployed to school comprises of Arduino Uno Rev3, LEDs, SG90 Mini Servo Motor, LDR Light Sensor Module, IR Sensor Module ...