GPIO reads on RPRO

udi_o

Hi,

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

Udi

Eric

It sounds like you need a pulldown resister on your circuit, possibly also clearing the output of the pin the thermistor is attached to.

udi_o

Thanks Eric, well spotted, the pulldown resistor (our hardware guy put on the R board) was missing on the RPRO.