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diycrap.blogspot.com has build a SWR and power meter based on Arduino Nano and LCD display:
First of all, this SWR meter in this article is not exactly homebrew, as I based the circuit on the schematic in the excellent book Arduino Projects of Amateur Radio. Although I bought the book and respect the copyright of the authors I will share my own schematic here. Why? First, the design in the book is not completely original and is based on similar designs from others. One example here. Second, I changed a few things, removed some stuff, and added some other things, to my own liking, so the design is not identical anymore.
DIY SWR and Power Meter – [Link]
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interest
canyou share with me for schematic and firmware?
thanks
Have you checked on the author’s website: https://diycrap.blogspot.com/2015/12/homebrew-swr-and-power-meter.html
not found for firmware sir