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Okay, thanks that clears that up. re: 'E.getTemperature( )'
https://www.espruino.com/datasheets/STM32F411xE.pdf
p.116 50C seems to be on the low end of their test cal rangesp.11 'The STM32F411xC/xE operate in the –40 to +105 °C temperature range'
p.32 3.30 Temperature sensor - Variation in internal temperature
Also note:http://www.espruino.com/Reference#l_E_getTemperature
'Note: This is not entirely accurate and varies by a few degrees from chip to chip. It measures the die temperature, so when connected to USB it could be reading 10 over degrees C above ambient temperature.'
Temperature sending code