#define M_RLY_A 23
#define M_RLY_B 15 
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(M_RLY_A, OUTPUT);
  pinMode(M_RLY_B, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(M_RLY_A, LOW);
  digitalWrite(M_RLY_B, HIGH);
  
  delay(100); // this speeds up the simulation
}