GPIO reads on RPRO


I'm running the Metawear-SampleAndroidApp connected to RPRO board streaming the GPIO_1 ADC data with thermistor probe connected to AIN1 and V3v. The only value I'm getting is 1020 regardless if I change the probe temperature. Attempts to connect to GPIO_0 yield the same result. The same setup with the same probe on the R board yields proper ADC values (around 436) that correspond nicely to temperature. Any clue what could go wrong?

Thanks for your support


  • It sounds like you need a pulldown resister on your circuit, possibly also clearing the output of the pin the thermistor is attached to.
  • Thanks Eric, well spotted, the pulldown resistor (our hardware guy put on the R board) was missing on the RPRO. 
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