Conflicting pins between the PCM library and speaker and the NRF24L01

Question

The PCM library uses pin 11 and the NRF24L01 also uses pin 11. I am using an Arduino nano, and don't know if there is any way to change the pins of either the speaker or the transceiver. https://github.com/damellis/PCM

Answer 1

No, you can't just change pins. Both systems use hardware that is specific to pin 11.

The best you could achieve would be to use a software SPI implementation on other pins to drive the nRF24L01, but that would mean changes to the library you are using to remove the SPI library usage and replace it with your own software SPI implementation.

• Epicmania: So does that mean it's basically impossible?
• Majenko: Not impossible, just a lot of work, and the results won't be as fast as with hardware SPI.
• Epicmania: Oh :(. Is there no way to edit the PCM library to use another pin? What makes pin 11 so special?
• Majenko: It's hard-wired to a specific timer to generate the PWM signal. You could re-write the PCM library to use different timers and their associated pins, but that would be more work and much harder to understand.
• Epicmania: I might be wrong, but didn't pin 11 in the PCM library have also been pin 3? So could it be changed to that?