Fried two devices today by simply connecting them to a power source.

Changed nothing in the circuitry, no shorts due to solder residues (a simple modification was made), no changes in the input parameters. Check.

The afromentioned devices should have only minor HW changes compared to a previous version I'm working with and as far as I can see absolutely nothing which should cause the damn microcontroller to release smoke like a steam train. (All right, a very miniature steam train.)

So the only significant difference might be the firmware which I didn't check yet but will tomorrow. Not my code and the corresponding IDE just basically sucks. Yay.

On the other hand, the Software part finally feels like I'm getting somewhere. It seems just ... to work. Very suspicious.

Feeling ambivalently frustrated and relieved at the same time. Sigh.