The control pin for the relay is connected to the pin 8 of arduino.
Arduino power control relay.
Project tutorial by christian.
Circuit diagram and working.
That configuration physically isolates the relays from the arduino with the module s built in optocoupler.
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.
Finally the power outlet box.
Control up to 65 280 relays with your arduino.
We need to open the box and make connections.
In this arduino relay control circuit we have used arduino to control the relay via a bc547 transistor.
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.
When the button is pressed the fan will turn on and will remain in this state until the button is pressed again.
Without the jumper cap you need to provide an independent power source to power up the relay s electromagnet through the jd vcc pin.
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.
Below given is relay driver circuit to build your own relay module.
The connections between the relay module and the arduino are really simple.
Use the io expander and relay expander with the arduino to control up to 65 280 relays.