MrDEB
Well-Known Member
Designing a simple 3 sensor thermostat for a one week a year beer cooler.
OBJECTIVE is to have 3 DS18B20 sensors that collect 3 temps from around the cooler. Add the three temps, divide by three then control the cooling compressor with a relay.
When the cooler obtains 35 degrees (DESIRED TEMPERATURE pot then compressor turns off for a minimum of 10 minutes to allow the evaporator to defrost if needed and allow the refrigerant to equalize (easier on the compressor).
Pretty basic setup but any helpful suggestions are welcomed.
Going to use Swordfish for code.
Basically two ADC inputs (DESIRED TEMP and DEFROST TIME). If 10 minutes is not enough to defrost the evaporator then adjust defrost time.
Poll the three sensors (could have each sensor on its own port pin)might be easier?
Then turn the relay on and off as needed.
Display shows Desired temp and Actual temp.
LEDs indicate when in defrost and cooling.
OBJECTIVE is to have 3 DS18B20 sensors that collect 3 temps from around the cooler. Add the three temps, divide by three then control the cooling compressor with a relay.
When the cooler obtains 35 degrees (DESIRED TEMPERATURE pot then compressor turns off for a minimum of 10 minutes to allow the evaporator to defrost if needed and allow the refrigerant to equalize (easier on the compressor).
Pretty basic setup but any helpful suggestions are welcomed.
Going to use Swordfish for code.
Basically two ADC inputs (DESIRED TEMP and DEFROST TIME). If 10 minutes is not enough to defrost the evaporator then adjust defrost time.
Poll the three sensors (could have each sensor on its own port pin)might be easier?
Then turn the relay on and off as needed.
Display shows Desired temp and Actual temp.
LEDs indicate when in defrost and cooling.