Arduino pins provide a low voltage which is only 5v to the relay module to control it.
Arduino 5v relay circuit.
Carries the trigger signal from the arduino that activates the relay.
Circuit diagram and explanation.
In this example we will connect the relay module with arduino in the normally open state.
1 channel 5v relay module for arduino with optocoupler 62 00 dupont wire male to female jumper wires ribbon cable pack of 40 79 00 141 00 for 2 item s.
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.
The connections for connecting the relay module with arduino are very simple.
Connects the arduino s 5v pin.
5v or 6v relay.
The only link is by the magnetic field.
So connect the 5v and the ground of the arduino with the 5v and the ground of the relay module.
The relay module has three low voltage terminals i e vcc gnd and signal.
This circuit is for a 5v relay to be attached to an arduino nano.
The arduino can be programmed to turn on the relay when a certain event occurs for example when the temperature of a thermistor gets higher than 30 c.
This makes it easy as arduino can power up the relay directly.
Coming to the design of the circuit it is very simple as we used a 5v relay module and not the individual components.
The second version is an actual relay board that i have at home and analyzed the circuit.
So in this arduino relay control tutorial we will simply learn how to interface a relay with arduino.
Inside the relay is a 120 240v switch that s connected to an electromagnet.
The switching contacts of a relay are completely isolated from the coil and hence from the arduino.
Here we are not using any relay driver ic like uln2003 and will only use an npn transistor to control relay.
The detail instruction code wiring diagram video tutorial line by line code explanation are provided to help you quickly get started with arduino.
When the relay receives a high signal at the signal pin the electromagnet becomes charged and moves the contacts of the switch open or closed.
A relay accomplishes this by using the 5v outputted from an arduino pin to energize the electromagnet which in turn closes an internal physical switch to turn on or off a higher power circuit.
The first version is a recommendation that i found on the internet.
If you used a 12v relay like we used in this project arduino relay control you need to use a separate power supply for relay.
Whenever we need to connect any ac appliance in our embedded circuits we use a relay.
