Ok, thanks, I'll do it later today, I don't have the boards with me at the moment. My main concern is that I'm checking it's stability and have always problems like that (for example exception 28 running sming examples). I've already made a change in the power supply, now I'm using a 5v 1a adapter with a 3.3v 1A regulator, and capacitors near the esp-01 pins, with very short connections, but it is still not stable. Could be a problem with the esp-01 modules? I have also some esp-12 in my desk, I could try them to see if the behavior is simila, just have to build some adapter. I've already ordered some modules from olimex including the development board to be sure that there is no hardware issue