I recently build 2 Arduino Single-Sided boards and am experiencing a very odd behaviour on both boards.
Without the ATmega chip installed and power applied to the board i have measured the voltage between pin 7 (vcc) of the ic socket and pin 19 of the ic socket and am reading approx. 3.6 V.
It must have something to do with the led because between pin 8 (GND at ic socket) and in between R3 and the led(LED 13) are 0V but between pin 8 and in between pin 19 (ic socket) and the led are approx 1.1V
I already checked like 5 times for unwanted solder bridges across the board and so on but couldn’t find any.
I’m completely at a loss here. Could anyone plz explain this to me?
just to be clear: led gnd o---------------------o---[1kOhm]---o---|<|---o nothing connected | <-> 0V | | <-> 0V | | <-> about 1.1V |