For the few dollars they cost, you get an awful lot of clever electronics in those little thumb USB MP3 players.. a little TOO clever for my application. I want to use one to play a sound effect when triggered..once only per triggering. However armed with only one button which, in various guises, turns it on, plays it (endlessly), pauses it or turns it off, this is proving to be a mission that even a PIC cannot resolve. The wretched thing seems to even sense if there is 1.5v going up the USB (in which case if boosts it up to 3.3v and acts like a player) or 5 volts (in which case it acts like a flash drive). Anyone ever seen a schematic for one of these Chinese widgets (full of unidentifiable chips) ? M
- posted
18 years ago