Arduino Mega2560, powered by USB Relay spec: http://www.weclonline.com/downloads/pdf/07-08-0005.pdf Supply voltage above 3.75V or supply current maximum 10mA is enough to turn the relay on Situation Output pin set to HIGH, measure the output under open circuit by DMM, output voltage ~5V Output…

Output pin cannot drive a relay

system March 17, 2012, 6:05pm 4

after setting the pinMode, the circuit works fine finally
thanks 8)

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