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I need to calibrate the Raduino.? I've reviewed the instructions and it seems fairly simple.?? My only question is where do most people attach the red wire to ground.?? It appears that one of?the 4 mounting holes on the Raduino board may be the most convenient as I did a continuity check and I found that they seem to have continuity with each other and the negative side of the DC connector.??

Thanks,??? Jim??? W6yxy