CI-V External Meter Project from VE2 Land
Here is a really nice simple (very!) project from a VE2 Friend of mine.
it is using a Yaesu made external meter adapted using and arduino nano to snif the CI-V protocol to display the S-Meter.
here is a hint I modified the code on mine just a little and added a couple of buttons to ALSO display SWR or Power :-P
Hope this helps :-P
Only the Best ICOM, ERC and HRD
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Richard VE2DX, Jesus Island, PQ-014