Project Overview This project automates street light operation based on ambient light levels using an LDR (Light Dependent Resistor) and a microcontroller (Arduino). At night, the resistance of the ...

Connect one end of the LDR to 3.3V and the other to the junction of the resistor and GPIO 35 (Analog Input). Relay Module: Connect the IN pin to GPIO 27, VCC to 5V, and GND to GND. Connect the pump ...

LDRs or Light Dependent Resistors are very useful especially in light/dark sensor circuits. Normally the resistance of an LDR is very high, sometimes as high as 1000 000 ohms, but when they are ...