Coming to the relay the 5v and gnd pins for the relay module are given from the arduino uno.
Arduino power control relay.
Control up to 65 280 relays with your arduino.
Circuit diagram and working.
In this arduino relay control circuit we have used arduino to control the relay via a bc547 transistor.
When the button is pressed the fan will turn on and will remain in this state until the button is pressed again.
Here to turn on the relay with arduino we just need to make that arduino pin high a0 in our case where relay module is connected.
Finally the power outlet box.
That configuration physically isolates the relays from the arduino with the module s built in optocoupler.
Learn how to use relay with arduino how relay works how to connect relay to arduino how to code for relay how to program arduino step by step.
In this quick arduino tutorial i will explain how you can control a relay using the arduino board one 1k and one 10k resistors 1 bc547 transistor one 6v or 12v relay one 1n4007 diode and a 12v fan.
The control pin for the relay is connected to the pin 8 of arduino.
First connect neutral wire from the supply to neutral connector on the socket.
Project tutorial by christian.
Use the io expander and relay expander with the arduino to control up to 65 280 relays.
The detail instruction code wiring diagram video tutorial line by line code explanation are provided to help you quickly get started with arduino.
Below given is relay driver circuit to build your own relay module.