Automatic Room Lights using PIR Sensor and Relay: Circuit Aug 08, 2015This automatic staircase light circuit switch on the staircase lights automatically when someone enters on the stairs and gets off after some time. There are two important components in this circuit, first is PIR Sensor (Passive Infrared Sensor) and second is Relay. Automatic Staircase Lighting Project using PIR Sensor and Jun 10, 2015This ATmega32 AVR Microcontroller based project covers an automatic staircase light circuit using PIR sensor and LDR. It check two conditions to start Automatic Switch-Off Staircase Light circuit diagram This is the circuit diagram of staircase light with automatic switch off. It based on timer which is can be adjusted with the needs of the time of walking (climbing up and going down) on the staircase. We have been all acquainted with all t Staircase Wiring Circuit Diagram – How to Control a Lamp Working & Operation of Staircase Wiring – 2-Way Light Switching. Consider the above 2-way switch wiring diagram which has been used to control a bulb in staircase. The schematic shows that circuit is completed and bulb is ON.