The remote can just turn up or down the flame, and i want to make a more intelligent thermostat using Arduino. The problem is that i dont know what kind of sensor the remote uses to send the wireless signal to the fireplace. It looks like an ultrasonic sensor, am i correct? If so, can i use the HC-SR04 sensor to simulate the remote? From what i've read, the HC-SR04 can only be used for distance measurement? What kind of sensor should i use on the arduino?