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SensorTile temperature readings

Question asked by David Heise on Jul 7, 2018

I am attempting to use a SensorTile for continuous audio recording and environmental monitoring, recording data to the SD card hosted in the cradle.  I am finding that temperature readings are unreliable/unusable, which I hypothesize is due to local heat being generated by the SensorTile.  I believe the temperature sensor on the cradle is the HTS221.


During recording, temperature readings start at ambient temperature (as recorded by an external reference) and begin to rise, typically to 31-33 C.


Does this hypothesis seem reasonable?  Has anyone else encountered this issue?  Is the heat likely generated by the STM32L476 MCU?  Is there a recommended heat sink to mitigate this issue?  Other known/recommended solution?


Thanks in advance.