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h4 / lywsd02

MIT License
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Support for negative values? #38

Open danergo opened 1 month ago

danergo commented 1 month ago

Is it possible to display negative (-2 °C) values on this hygrometer?

53RT commented 1 month ago

It does display negative temperatures. But I don't know how it will display double digit negative values as there is no third 7-segment digit for the temperature. In the spec sheet it says the device is not suited for under 0 °C. I also remember when testing low temperatures that the display gets dark and unresponsive at some point.

danergo commented 1 month ago

Thx. According to some disassembled pictures, it sports Sensirion's SHTC3 sensor which is capable for measuring between -40 - 125 ˚C.

My plan is to get rid of the firmware and rebuild it, and use the large displays (where now the clock is) to display the outside temperature (which is sometimes negative).