Hello everyone I have encountered this problem with: Arduino uno and eth Shield. case 1) if the power is supplied by USB, the arduino and eth shield work currectly case 2) if the power is supplied by External Power (12V) the green led on arduino is ligth on, but eth shield doesnt work: the PWR l…

Power issues with arduino uno and eth Shield

SurferTim September 26, 2016, 1:15pm 4

Try a 9v wall wart.

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