Together with the STC 3000, the STC 1000 and the STC 3028, the STC 3008 is one of the extremely popular temperature sensors with automatic relays. The hardware costs less than $ 10 and is particularly suitable for hobbyists. There are countless use-cases and projects for this device. The advantage of the STC 3008 is that there are actually 2 thermostats in one device. The device is also easy to use if you know how. But the Google search unfortunately does not provide any reasonable results for a useful user guide or operation manual. We have therefore documented here how to operate the STC 3008.
There is an up and down key for each sensor. If you want to use the sensor for cooling, press the down key for a few seconds. The currently set desired temperature appears and flashes. A new ideal temperature can now be set using the arrow keys. If you stay longer on the up key, the currently set maximum temperature appears. This can be adjusted now. The sensor is now set to activate its cooling relay as soon as it measures a temperature value that exceeds the set maximum temperature. In this case, the relay remains active until the cooling reaches the set ideal temperature.
If you want to use your sensor for heating, also press the button down and hold it until the display flashes. Then you can set the ideal temperature. But since you are now using the sensor for heating, you do not need to set a maximum temperature with the up arrow key. Instead you need to set a minimum temperature. As soon as the temperature drops below this minimum, the sensor activates its relay with the heating element and provides heat until the ideal temperature is reached again. The relay with the heating element only switches off when the ideal temperature is reached.
In addition, you can reset the device by holding down both arrow keys simultaneously.
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