1 Channel 5V Relay Module

A 1-Channel 5V Relay Module is an electronic switching device that allows a low-power microcontroller (like an Arduino, Raspberry Pi, ESP32, etc.) to safely control high-voltage or high-current appliances, such as lights, fans, motors, and pumps. It acts as an electrically operated switch, using a 5V signal to open or close the circuit connected to a higher voltage source (like 220V AC or 12V DC).

Technical Specifications:

• Operating Voltage: 5V DC
  
• Trigger Voltage: 0–2V LOW (active low) to activate the relay
  
• Control Signal Voltage: 0–5V (compatible with 3.3V and 5V logic)
  
• Relay Type: Electromechanical relay (typically SRD-05VDC-SR-C)
  
• Number of channels: 1

Pinouts:

Connection with Arduino:

Relay Output terminal(Screw terminals)

Sample code:

const int relayPin = 7;

void setup() {
  // Set the relay pin as OUTPUT
  pinMode(relayPin, OUTPUT);
}

void loop() {
  // Turn the relay ON (active LOW)
  digitalWrite(relayPin, LOW);
  delay(1000); // wait 1 second

  // Turn the relay OFF
  digitalWrite(relayPin, HIGH);
  delay(1000); // wait 1 second
}