Hey folks, I got a few recordable greeting card modules like these: http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&_trksid=p4340.l2557&item=221063227103&nma=true&rt=nc&si=OBchbxdESDmSuRd%252BBbh2CAt3ego%253D&orig_cvip=true&rt=nc#ht_2686wt_1397
I'd like to trigger them to play their recorded clips using an Arduino sketch. I know that one needs to be careful about how much current passes through a microprocessor pin, but I don't know how to tell if that will be a problem in this case. Ideally I want to do something super-simple like:
1. Share vIn (5v) with the module, eliminating the need for its batteries
2. Connect the 2 leads from the "play" switch to two pins on the Arduino. Set one high and one low to mimic the "off" state of the switch.
Then setting both pins low for a hundred ms or so should complete the circuit in place of the current momentary-contact play switch and make the module play its sound.
What should I watch out for here? If I do need to provide some isolation, what would be the simplest way to do it? Thanks.