/*
Flip the polarity (- => + )& (+ => -)at same time)
with A4988 Driver Relay Module Example
*/
#define relay 8
void setup() {
pinMode(relay, OUTPUT);
digitalWrite(relay, LOW);
}
void loop() {
//red led
digitalWrite(relay, HIGH);
delay(500);
//green led
digitalWrite(relay, LOW);
delay(500);
}