const int Relay = 13; const int sen1 = 2; const int sen2 = 3; const int sen3 = 4; void setup() { Serial.begin(115200); pinMode(Relay, OUTPUT); digitalWrite(Relay,HIGH); delayMicroseconds(2500); digitalWrite(Relay,LOW); } void loop() { int val1 = digitalRead(sen1); int val2 = digitalRead(sen2); int val3 = digitalRead(sen3); Serial.println("SEN1"); Serial.println(val1); Serial.println("SEN2"); Serial.println(val2); Serial.println("SEN3"); Serial.println(val3); if(val1==HIGH && val2==HIGH && val3==HIGH) { digitalWrite(Relay,HIGH); delay(250); digitalWrite(Relay,LOW); } else if(val1==HIGH && val2==LOW && val3==HIGH) { digitalWrite(Relay,HIGH); delay(250); digitalWrite(Relay,LOW); } else if(val1==LOW && val2==HIGH && val3==HIGH) { digitalWrite(Relay,HIGH); delay(250); digitalWrite(Relay,LOW); } else if(val1==LOW && val2==LOW && val3==LOW) { digitalWrite(Relay,HIGH); delay(250); digitalWrite(Relay,LOW); } }