QTR-8RC with Adafruit Feather 3.3v

Hi there,

I am trying to make a simple line following robot but currently struggling to get the sensor to talk to a 3.3v processor board (Adafruit Feather nRF52 Bluefruit). I have posted on their forum and they suggested asking you if you had any previous experience on this: https://forums.adafruit.com/viewtopic.php?f=57&t=159569&p=785679#p785679

The readings from the sensor are fine when testing on Arduino Uno, but become very low resolution on the Feather. Any idea why that could be happening and how it can be fixed?

Thanks, G


Your time to charge up the capacitors in series with the QTR sensors might not be sufficient for your lower voltage board, so you might start out by increasing that interval to see if that improves your results. If you are using our library, the default value for that is 2500 μs, so you could increase it from there with the setTimeout command.

If that does not work, can you post some pictures showing your connections and how you are testing your reflectance sensor? Could you post some sample readings?

- Patrick