Hi, I have an arduino uno r3 running a servo based on the inputs from a sharp ir range sensor. Things work fine when the Arduino is powered through USB port. The servo and sensor is running off the Vin on the board. The sketch works fine this way. But when I disconnect the USB and power the Arduino…

External power supply problem

patduino November 24, 2012, 6:57pm 5

Are the grounds connected? This is a very common error / oversight.

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