![]() Press the '+' button till the 'C' becomes an 'H' ( for Heater). ![]() Most likely the display will show a 'C' (for Cooler). You need to change that Press the SET for 5 secs button until P0 appears in the display. In factory setting, the device is most likely set as a cooler rather than a heater. The measured temperature will start flashing and you can set that to the desired switching temperature with the '+' and '-' keys. This is the way to set it:įirst set the temperature: Press the SET button for 2 sec. The W1209 thermostat can be used to cool as well as to heat. I mounted the thermostat on a piece of cardboard that I attached to the box at an angle for easy reading. The Thermostat needs 12 Volt, mainly for the relay and has a 5 Volt regulator for the rest of the circuit. For who is interested, there is also an ATMEGA-8 version on a Russian alcoholdistiller site. This thermostat is basically an NTC with an 8 bit STM8S003F3P6 microprocessor, a display and a relay. The Hygrometer will not control the humidity but at least give info about it and the 1/240 RPM motor can be left on continuously as it will slowly turn the eggs so they make a full turn every 4 hours The Thermostat will control the temperature.
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