Relay

Relay, also known as electrical relay, is an electronic control device, usually used in automatic control circuits, it is actually a kind of "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays the role of automatic adjustment, safety protection, and conversion circuit in the circuit.

You will need:

Arduino Uno *1
1 relay module *1
Breadboard *1
LED *1
100 ohm resistor *1
Jumpers

Wiring:

Sample Code:

int sign= 3;
int led= 4;
void setup(){
pinMode(sign, OUTPUT);
pinMode(led, OUTPUT);
digitalWrite(led, HIGH);
}

void loop(){
digitalWrite(sign, HIGH);
delay(2000);
digitalWrite(sign, LOW);
delay(2000);
}

If you need 5V relay:

👉 5V Relay

If you need other relays: 

👉 Other Relays

More Electronic Component，welcome to HALJIA!