first time I write here, sorry but this time it took days of googling and frustration and I didn't make it anyway :)
I got myself a bunch of Pro Minis 5V/16 (R5) and a "USB2serial Light" adapter for stuffing them.
Got some problems understanding why the Tools/Board/Right-type doesn't work, however the simple "Mini with 328" gets the job done. Code uploaded, works like a charm.
BTW, the purpose is to broadcast packets via an RF12B module.
The receiving station (a UNO R3) says everything's fine, packets are coming as intended.
And here lies the rub. Once I disconnect the USB2Serial and feed the Pro Mini with an external stabilized 5V (same pin I use to feed it from the USB2Serial), BAM, goes flatline. The LED is on, but nobody's home.
Removing TX/RX wires, the 100nF cap (reset pin) didn't help.
Since I couldn't remember how the reset pin is wired, I also tried to pullup/pulldown it, to no avail. No action, just the LED staring at me (and I'm sure, laughing its anode off).
As soon as I unplug the external power and reconnect the USB2serial it starts broadcasting again, without the need to upload.
Before you ask: same behavior even with an adapted version of Blink.
I know it can't be, but it feels like the code is running on the USB2serial, not the Pro Mini, if you know what I mean.
I'm sure it's something trivial I missed, but can't find out what.
Thanks in advance,