I am looking into the use of an MP3 player to proide the source of audio clips under control of a PIC (peripheral interface controller - think of it as a computer if you aren’t familiar). I need to know whether a Clip+ would do what I want, so perhaps an owner could advise, based on the following information.
I narrowed my selection of MP3 player down by looking for those that can be powered (main-USB power pack) at the same time as playing (some ultra-cheap players share the headphone socket for power). Battery life is not important as it would be powered by adaptor continuously. I know that it can’t play whilst connected to a USB port of a computer (unless you block the two centre USB pins that are for data). Cost was also a consideration, i.e. cheap as possible without compromising sound quality too much (the audio would go through a 30W amplifier for a public area).
Here’s what I plan:
Take the Clip+ apart to gain access to the switches under all controls. Q: Anyone taken a Clip+ apart? If so, is it difficult or just a bit of teasing apart the plastic clips on the case?
Attach wires to the relevant switch contacts. Cut away the case for wire exit and reassemble the player if possible (it probably wouldn’t matter if I had to leave the case off but would just be neater if all together again).
Connect the wires (via suitable electronic interface) to the PIC (I can do the electronics).
Now, I should be able to simulate pressing any of the controls by programming the microcontroller suitably. I’ll be able to programme the duration, in case there’s any “press and hold for x seconds” requirement.
I need to know which buttons/switches on the Clip+ that I’ll have to control, based on what I want it to do, which is:
Select a single track from several MP3 files, play just that track then stop/pause. The single track might be say the fourth one of twenty, so I need to be able to get to it (maybe that’s press forward three times for instance?). A while later (determined by the PIC), I might need to play the seventh track, again, just play the one track then stop. If it needs repeated “press forward”, that would get a bit long-winded if I wanted say the 34th track, so any shortcuts to selecting track need to be considered.
I’ll probably have to elaborate but that’s your “starter for ten!”