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The weather sensors sketch is located in pypilot/arduino/weathersensors of the pypilot git repository.
To upgrade the sensors, the recommended system is openplotter, or another linux system with arduino support installed.
To install the software needed to compile and load the sketch:
$ sudo apt install arduino $ git clone --depth=1 https://github.com/pypilot/pypilot $ cd pypilot/arduino/weathersensors $ make upload
If there is a failure, repeat the “make upload” command several times. It may be necessary to modify the Makefile and adjust the DEVICE or BAUDRATE. Some boards use a BAUDRATE of 115200, others will use 57600.