In that case you probably have a cheap clone board. If you have something totally different this will not work. Important! Only attempt this process if you can see that you have an ATmega8U2 or ATmega16U2 chip on your board (see below). Wire the Uno to the chip being tested as follows: Arduino Uno Target chipĬheck your wiring! If you wire things around the wrong way you can turn a good chip into a bad one. On the board pin 1, has a small white dot.īelow are the ICSP pin names, seen from above (component side). I have circled the correct header pins, and pointed to pin 1. a Uno) to detect the signature on that chip, as per my sketch on Sketch to detect Atmega chip types.Īll you need is 6 hookup wires to connect your testing board (the known good one with the sketch on it) to the ICSP header on the Mega. If your Mega has an ICSP header for the USB chip (circled below) then you can test that chip.
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