![]() (Any one got the reference, huh ?)īut really, consider using this instead which claims to be fully isolated: Because of that some solutions are not accepted. I wish to make a kind of do it all, and use a display to show the information, frequency, wave form, peak voltage, rms voltage. What are you measuring ? peak voltage or RMS voltage and/or frequency and how are you going to display it ? In that case, if i connect the arduino gnd to live wire, some thing for sure will blow. Yup, I don't intend to use it on computer, at least while Im measuring high voltage, because of gnd in arduino is connect to a real gnd of the computer. If you do choose to isolate your Arduino, for example in a plastic box, you can't use the USB cable to connect to the serial monitor or expose any metal parts. Assuming that the gnd of arduino is the battery negative, and that the entire board is isolated from any path to real ground (earth) ( special trough the human body lol), connect the live wire to arduino gnd, will do harm to the board in this particular circuit ? If you use a 2 pin mains plug for your voltage divider side, the "Ground" on the Arduino side could be at mains potential, depending on the orientation of the plug ! The "ground" marked on the mains supply is AC neutral not AC Earth. For sure it is.As general rule, I do things first and think about later. ![]()
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