8 Channel Relay Board FOR ESP32 30 pin DEVKIT V1 5V ET6267

• ESP32 DEVKIT V1 NOT INCLUDED
• Support ESP32 DEVKIT V1  30 PIN Development Board
• RELAY PINS 23 ,22,21,19.32,33,25,26
• SUPPLY VOLTAGE 5V
• INBUILT RESETTABLE PPTC FUSE & TVS DIODE
• Reverse Polarity protection
• Opto isolated signal pins
• MADE IN INDIA
  

Sample code 

// SELECT ESP32 Dev Module
//// relay pins
#define relay1 23
#define relay2 22
#define relay3 21
#define relay4 19
#define relay5 32
#define relay6 33
#define relay7 25
#define relay8 26
void setup()
{
  // initialize RELAY pins as an output.
  pinMode(relay1, OUTPUT);
  pinMode(relay2, OUTPUT);
  pinMode(relay3, OUTPUT);
  pinMode(relay4, OUTPUT);
  pinMode(relay5, OUTPUT);
  pinMode(relay6, OUTPUT);
  pinMode(relay7, OUTPUT);
  pinMode(relay8, OUTPUT);
  digitalWrite(relay1, HIGH);
  digitalWrite(relay2, HIGH);
  digitalWrite(relay3, HIGH);
  digitalWrite(relay4, HIGH);
  digitalWrite(relay5, HIGH);
  digitalWrite(relay6, HIGH);
  digitalWrite(relay7, HIGH);
  digitalWrite(relay8, HIGH);
  timer();
  digitalWrite(relay1, LOW);
  digitalWrite(relay2, LOW);
  digitalWrite(relay3, LOW);
  digitalWrite(relay4, LOW);
  digitalWrite(relay5, LOW);
  digitalWrite(relay6, LOW);
  digitalWrite(relay7, LOW);
  digitalWrite(relay8, LOW);
  timer();

}

// the loop function runs over and over again forever
void loop()
{
  digitalWrite(relay1, HIGH);
  timer();
  digitalWrite(relay1, LOW);
  digitalWrite(relay2, HIGH);
  timer();
  digitalWrite(relay2, LOW);
  digitalWrite(relay3, HIGH);
  timer();
  digitalWrite(relay3, LOW);
  digitalWrite(relay4, HIGH);
  timer();
  digitalWrite(relay4, LOW);
  digitalWrite(relay5, HIGH);
  timer();
  digitalWrite(relay5, LOW);
  digitalWrite(relay6, HIGH);
  timer();
  digitalWrite(relay6, LOW);
  digitalWrite(relay7, HIGH);
  timer();
  digitalWrite(relay7, LOW);
  digitalWrite(relay8, HIGH);
  timer();
  digitalWrite(relay8, LOW);
}

void timer(void)
{
  delay(500);
}