💬 STM32 Sensor Node
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@gohan: I'm not sure. The antenna trace is surrounded by the ground plane up to the ANT hole so I assumed antenna length would need to be measured from there but that might not be correct. I'm not 100% sure though and don't know how much of an impact it might have. I will test both lengths once the boards arrive. Any insight would be appreciated.
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Assembled and performed a few simple tests: upload using SWD, upload using serial (using buttons to select boot mode), running securitypersonalizer and basic mysensors sketch with RFM69 initialization. Everything seems to be working. More extensive tests will be performed later.
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@freyender - nice project, perfect for my needs. So I got a couple of boards from OSHpark, ordered some parts online then I went to populate one of the boards and realized there's no silkscreen for parts! Do you have an overlay or something that tells me which part goes where? Or am I being thick and missing something that is right under my eyes? Thanks!
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@ian1scott: sorry for the late reply. The part references can be found in the Fab layer in the kicad file.
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Power consumption should be comparable to the blue pill with leds and regulator removed. Never got around measuring it myself but here are some results for the bluepill: https://www.stm32duino.com/viewtopic.php?f=3&t=658&start=40 , stating 13µA in STOP mode.
Also note that last time I checked, low power was not supported in MySensors for these MCU's so you would need to add it in yourself. -
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