relay on off on the basis of others relay operation condition

Projects Programming
1

i want to ON/OFF one relay on the basis of other relay operation condition.
i trued in this way.but if loop doesn't work.please help me

#define RELAY2 46
#define RELAY4 30
#define RELAY3 31
pinMode(RELAY2, OUTPUT);
pinMode(RELAY3, OUTPUT);
pinMode(RELAY4, OUTPUT);

if(RELAY3==LOW)
{
digitalWrite(RELAY4,LOW);
if(current01>0.50)
{
digitalWrite(RELAY3,HIGH);
}
}

2

Try:

#define RELAY2  46
#define RELAY4  30
#define RELAY3  31
void setup()
{
  pinMode(RELAY2, OUTPUT);
  pinMode(RELAY3, OUTPUT);
  pinMode(RELAY4, OUTPUT);
}
void loop()
{
  if (digitalRead(RELAY3) == LOW)
  {
    digitalWrite(RELAY4, LOW);
    if (current01 > 0.50)
    {
      digitalWrite(RELAY3, HIGH);
    }
  }
}
3

yes ,work well.thank you

4

Glad to help, karma point for acknowledgement.