Software detail

[Yerffog]

Thanks. Managed to get past that and have an interrupt driven timer generating all time intervals.
The program is working as expected.
I wonder what the chance of doing some dsp filtering is?
I have all the equations just need to write the code.
I will try the code posting at some stage.

 

[PaulStoffregen]

I wonder what the chance of doing some dsp filtering is?

The audio library can run many concurrent filters processing 44100 Hz sample rate. Processing in data in blocks (as the audio library does) rather than 1 sample at a time makes a huge difference.