IR Relay Control

This project shows a simple way to detect a near object (like a model train passing) and activate a relay.

Supplies

5 volt relay module

IR detector module

Step 1:

Make sure the little yellow jumper is placed close to the "L" end (the IR sensor goes low when it detects an object).

Step 2:

Connect according to this schematic. The power supply used is 5 volts dc. The small blue potentiometer can be turned to adjust sensitivity.

Step 3:

When the object is close, the relay will close (note the small red light on the relay module). When the object is not close, the relay will open.