On Arduino Uno Rev3, I just ran the speaker_pcm (here) demo that used TIMER1 and TIMER2 to generate a PWM wave. However, this means that the Pins 3, 9, 10 and 11 can not be used anymore; according to the documentation: Takes over Timer 1 (16-bit) for the 8000 Hz timer. This breaks PWM (analogWrite(…

Use SD Card while Pin 11 is being used for PWM

ieee488 April 22, 2018, 2:29pm 2

You may want to Google on whether it is possible to use software SPI for your SD card module.

11,12,13 are the hardware SPI pins

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