Reply To: Pin 10 mystery

[Anonymous]

My motive here is to make use of one of the ATMega328’s hardware timers, either Timer1 (disabling pins 9 & 10) or Timer2 (disabling pins 3 & 11). Based on what you have said above, it sounds like pin 11 (MOSI) is hardwired and can’t be moved. If this is the case, then I should be able to re-assign the SD-Chip Select from pin 9 to something else using the same method in your demo video, so I can make use of an interrupt service routine that uses Timer1.

I guess my next question would be, do you expect the MP3 playback to be impacted by running a quick and simple ISR on the Arduino every 2 miliseconds?