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The amount of current that can be drawn from a COM port is not part of its specification. You would need to look up your individual COM port's drivers and find out how much current they can provide. Practically speaking, you can pull 10-20mA without trouble, as serial mice used power from these signal lines to power the mouse, and they operated in this ...


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Well, after around 6 or 7 hours of dealing with this I finally solved it when I started playing around with a high voltage programmer. I hope this can help someone in the future. The problem was that the Attiny13 came with the fuse bits set wrong. They were F6 F8, which meant that ISP programming was disabled (SPIEN bit unprogrammed). To make matters worse ...


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Use a voltage divider from Arduino Tx to Pi Rx like this. You can connect the Pi Tx to Arduino Rx directly. Important Update: Connect a similar voltage divider on the Pi Tx - Arduino Rx line also. This is necessary to protect Pi in case of accidental 5 V on the Arduino Rx pin (due to bug in code etc.). I have updated the circuit. simulate this circuit &...


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