Whenever we need to connect any ac appliance in our embedded circuits we use a relay.
Arduino 5v relay circuit.
Coming to the design of the circuit it is very simple as we used a 5v relay module and not the individual components.
5v or 6v relay.
The connections for connecting the relay module with arduino are very simple.
The switching contacts of a relay are completely isolated from the coil and hence from the arduino.
The second version is an actual relay board that i have at home and analyzed the circuit.
It can be turned on or off allowing the current through the circuit.
Circuit diagram and explanation.
Since the arduino operates at 5v it can t control these higher voltage devices directly but you can use a 5v relay to switch the 120 240v current and use the arduino to control the relay.
This circuit is for a 5v relay to be attached to an arduino nano.
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.
Inside the relay is a 120 240v switch that s connected to an electromagnet.
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.
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.
A relay is basically an electrical switch that is operated by an electromagnetic switch.
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 relay module has three low voltage terminals i e vcc gnd and signal.
The first version is a recommendation that i found on the internet.
Arduino pins provide a low voltage which is only 5v to the relay module to control it.
So connect the 5v and the ground of the arduino with the 5v and the ground of the relay module.
Here we are not using any relay driver ic like uln2003 and will only use an npn transistor to control relay.
Carries the trigger signal from the arduino that activates the relay.
So in this arduino relay control tutorial we will simply learn how to interface a relay 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.
In this example we will connect the relay module with arduino in the normally open state.
This makes it easy as arduino can power up the relay directly.
The detail instruction code wiring diagram video tutorial line by line code explanation are provided to help you quickly get started with arduino.
