You can put in a temperature set point into the Sharp AC that will cycle the condensor on and off, but the fan blows all the time even with the condensor off. It is probably not a bad idea to let the fan circulate air even when the condensor is off. I plan to do take some temperature measurements with and without the fan on to see the difference and to also measure the power draw to see how much electricity I am using in the fan-only mode.
If I do decide to turn the entire unit off when the temperature setpoint is reached and turn it back on again after the temperature rises a certain number of degrees above the setpoint, which of these two ways (or others if there is a better way to do this) would you recommend to determine if the AC unit is powered on or off. I don't have an ELK or any other automation hardware other than my MLServer PC.
- 1. Measure the temperature in the closet every x minutes.
- a. If the temperature is above my "turn the AC on" temperature and the past several temperature readings indicate that the temperature is rising, send the power toggle command because it must mean that the AC was off. Set an MLServer variable to indicate that the AC is on. Otherwise do nothing.
- b. Once the temperature falls below the "turn the AC off" temperature and the past several temperature readings are declining, it must mean that the AC was on, so send the power toggle command to turn off the AC. Set an MLServer variable to indicate that the AC is off. Otherwise do nothing.
I figure that this way, even if the IR is not received or I turn the AC off when I really wanted it to be turned on, it would eventually be corrected the next time the temperature of the closet was evaluated.
- 2. Get a power sensing device and hook it up to the AC. I would defintely know the state of the AC and would know for sure that I was turning it on or off when I send the power toggle command. Is there a 1-Wire device that would allow me to sense the power without having to buy additional hardware?