1-Channel Relay Module

📋Technical Specifications

Arduino library: Built-in digitalWrite

• Control voltage: 3.3 V or 5 V
• Switch rating: up to 10 A at 250 V AC
• Opto-isolated input
• Active LOW on most modules

📍Pinout

• VCC → 5 V
• GND → GND
• IN → GPIO26

🔗Wiring

Connect each pin as shown in the pinout section above.

⌨️Code Example

Copy into Arduino IDE. Install the library listed above first.

#define RELAY 26
void setup() { pinMode(RELAY, OUTPUT); digitalWrite(RELAY, HIGH); }
void loop() {
  digitalWrite(RELAY, LOW);
  delay(2000);
  digitalWrite(RELAY, HIGH);
  delay(2000);
}