ripred / cputemp

Arduino Library to calculate the processors internal temperature using nothing more than the ATmega processor itself! Absolutely no additional components or connections are needed!

Hi there I'm Trent. 👋 Welcome to my repositories!

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cputemp's Issues

ADC value to °C equation

For the ATmega328P:

return (wADC - 292.31 ) / 1.22;

In the datasheet chapter 24.8 is a "typical case" for 3 Temperatures in mV. AREF ist typically 1.1V .

This "typical case" approximates to temperature = wADC/1023 * AREF * 942.485 -272.389

Perhaps a AREF & offset parameterization should be possible.

Alongside... my two 328p's have AREF= 1.059V & 1.056V bandgap voltage and +65°C offset finally. AREF could be measured.

MEGA 2560

Tried your Library on an Arduino MEGA 2560 but the results i got are wrong it mesures about 500°C which is obviously wrong (tried with example code) but the same code worked flawless on an Arduino UNO
Any Help appreciated