I am working on detecting fingers being placed on guitar frets. My idea is to run a small voltage through each of the strings, a different voltage for each string. The player touches the string and makes the string touch the fret. On the end of the fret I detect the voltage with a micro-controller. Since each string has a different voltage, I know which string is touching the fret. So far, so good. But when two strings touch the same fret, I don't get the addition of the two voltages. The voltage goes down.
I am using a 5V input and then using resistors as voltage dividers to get the different voltages for each string. See pictures attached.
I am using a 5V input and then using resistors as voltage dividers to get the different voltages for each string. See pictures attached.
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