I've two Arduinos (Arduini?), a Uno and a Mega, in a case which originally contained a SCSI CD drive, so it has a PSU (12V and 5V). Both have their Vins and their Grounds connected to the PSU 5V output. I want to program them (one at a time) with the same USB lead. Do I need a DPDT switch on just t…

Two Arduinos with one USB 2 lead.

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