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