@brewnut The RTS pin is not used by the firmware, but driven by the UAB/UART bridge. But you can also use another pin, like P6.

@gmaitre The 3.3 V output can supply up to 1 A current, so supplying a DHT22 and GPS module should not be a problem. The PyTrack board has an additional connector on the bottom, with some GPIO pins exposed, for instance P10 (G17) and P11 (G22). These could be used to connect the DHT22.

@Jurassic-Pork thanks! Will give it a try. Best regards.

@robert-hh Ok thank you (I use the good pin and all of your code).