4 Channel Relay and 4 Channel opto ISOLATED INPUT BOARD FOR ESP32 38 PIN 5V ET10964

Description

• HIGH QUALITTY FR4 DOUBLE SIDE PCB

SAMPLE PROGRAM

#define relay1 23

#define relay2 22

#define relay3 21

#define relay4 19

void setup() {

// initialize digital pin LED_BUILTIN as an output.

pinMode(relay1, OUTPUT);

pinMode(relay2, OUTPUT);

pinMode(relay3, OUTPUT);

pinMode(relay4, OUTPUT);

digitalWrite(relay1, HIGH);

digitalWrite(relay2, HIGH);

digitalWrite(relay3, HIGH);

digitalWrite(relay4, HIGH);

delay(1000);

digitalWrite(relay1, LOW);

digitalWrite(relay2, LOW);

digitalWrite(relay3, LOW);

digitalWrite(relay4, LOW);

delay(1000);

}

// the loop function runs over and over again forever

void loop()

{

digitalWrite(relay1, HIGH);

delay(1000);

digitalWrite(relay1, LOW);

digitalWrite(relay2, HIGH);

delay(1000);

digitalWrite(relay2, LOW);

digitalWrite(relay3, HIGH);

delay(1000);

digitalWrite(relay3, LOW);

digitalWrite(relay4, HIGH);

delay(1000);

digitalWrite(relay4, LOW);

}