The “Automatic Stair Light System using Ultrasonic Sensor” project is a simple yet innovative solution to the problem of having to manually switch on the lights when using a staircase. This project ...

For this, we need a light sensor ... use LDR to automate the lights according to requirement. As per the circuit diagram, we have made a voltage divider circuit using LDR and 100k resistor. The ...

1. Fig 1: Author’s prototype for Automatic Washroom Light Using IR Sensors The circuit diagram of the automated washroom light is shown in Fig. 2. It is built around Arduino Uno (Borad1), BC547 ...