 int B=3975; //B value of the thermistor
 
 int incomingByte = 0; // for incoming serial data
+int relay_delay = 0;
+bool relay_delay_counting = false;
 
 float battery_value = 0.0f;
 float temperature = 0.0f;

        digitalWrite(led_pin,LOW);
    } else {
        // delay the loop if there was no input
        delay(250); 
    }
}
        } else if (incomingByte == 51) { // turn relay on if input was ASCII "3"
            digitalWrite(relay_pin,HIGH);
            Serial.println("{ \"relay_state\": 1 }");
            relay_delay = 30 *4; //30s
            relay_delay_counting = true;
        } else { // otherwise, reply with sensor data
            
            // print data in json format
