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