What is the "on_board_temperature" exactly?

There is an additional temperature sensor on the PCB (printed circuit board), which sits on the top of the sensor (think top part), above the soil. Therefore, this temperature sensor gives an indication of the air temperature.

Note: The onboard temperature sensor will show similar movements as the soil temperature sensor. The deeper the soil sensor is dug into the ground, the more the correlation will get lost, as the temperature in the soil usually fluctuates much less.  

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