Hi, I was trying to build a coffee roaster, and I was using a 19v power supply and two MOSFETs. At one point, while the Arduino was disconnected from the USB power, it was still running the sketch, and the fan controlled by one of the MOSFETs was running. I quickly disconnected the MOSFET first and …

What did I do to the Uno? Please help...

olimex May 12, 2014, 5:22pm 7

Sorry, flyback diode

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