Home › Forums › Sparkfun MP3 Shield Library Support Forum › Available PWM Pins for use with sensors? › Reply To: Available PWM Pins for use with sensors?
Yes, you could you cut SJ2 or remove D13 from the SFE MP3 shield, freeing D3, from the VDSP’s UART’s RX pin. Where this signal is safely pulled up, as to make it idle. Note that in the code D3 is not actually implemented. So again it is available, for you to use. I believe I have done this before for PWM to drive IR LED’s.
You want to cut the VDSP’s UART RX pin is principally for MIDI commands but it also can be used for other items. Hence it is wise to severe the PWM’s output to this, as not to cause superfluous UART data to the VDSP.
Similiarly D4 can be recovered, by cutting SJ1 or removing R14, to get another Digital IO
