PI backend Atmega328P and firmware

[Teleno]

Updated schematic, DipTrace file and firmware for the digital volume version.

The median filter had to be scaled back to 5 samples due to the extra overhead by the PWM interrupts.




[ATTACH]n426240[/ATTACH]

Diptrace file [ATTACH]n426239[/ATTACH]


Firmware [ATTACH]n426241[/ATTACH]

[Gunghouk]

Please excuse the dumb question but I assumed the audio to be a PWM frequency within the selected range in software ie 400-1000Hz. How does the timer convert this high freq PWM to audio?

[Teleno]

Please excuse the dumb question but I assumed the audio to be a PWM frequency within the selected range in software ie 400-1000Hz. How does the timer convert this high freq PWM to audio?

It's explained here in detail.

https://www.geotech1.com/forums/foru...n-arduino-nano

[Gunghouk]

Ok thanks. Digesting