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@robert-hh, the method function very well, thank you

@lollisoft M3 matches the expansion board. Looking at the pitctures in the docs, PySense and PyTrack seem to have 2mm mounting holes.

I had simmilar issue using VIN. I can't believe Pycom doesn't provide any schematic for these expansion boards, or atleast proper descriptions on how they can be used. I was also under the impression that VIN can be used as an input, instead of using the USB. There are NO WARNINGS anywhere that you should not be using VIN as an input, while using a battery as a backup. Luckily my house didn't burn down as I soon enough figured out that VIN and the Battery + seem to be linked together... I'm new to Pycom's hardware - and thus far really disappointed in the lack of usefull (and up to date) documentation

@RobTuDelft ok fair enough. so Following code should work right? import time from machine import Pin import machine import pycom pycom.heartbeat(False) def toggle_rgbled_blue(arg): pycom.rgbled(0xff) time.sleep(2) pycom.rgbled(0) def toggle_rbgled_red(arg): pycom.rgbled(0x7f0000) time.sleep(2) pycom.rgbled(0) button_blue = Pin('P10', mode=Pin.IN, pull=Pin.PULL_UP) button_blue.callback(Pin.IRQ_RISING, toggle_rgbled_blue) buton_red = Pin('P0', mode=Pin.IN, pull=Pin.PULL_UP) button_red.callback(Pin.IRQ_RISING, toggle_rgbled_red) Cheers Colombian

@cfaessler Did you eventually tried the 18650? Can you share some experience? Thanks!

Just tried to power my sensor as you said and it is indeed working, are there any risks of doing so ?

For anybody else that might have this problem, before trying to erase the flash you need to have a wire connected between G23 and GND and reset the board.

@blsmith Using the OEM module + baseboard reference design is practically the same as buying the WiPy, LoPy, etc kits. If you don't want to design a custom board buying the development kit is probably the best option.