Minimalist Arduino DSP
About Minimalist Arduino DSP
This is the the most basic setup for doing decent quality audio effects with an Arduino. The system is based upon both our PWM tutorial and our ATmega ADC tutorial. The basic setup is a 10 bit value read in from ADC0, and played out via a 16 bit, Dual PWM on pins 9 and 10. there are 2 buttons, on pins 2 and 3, which can be used to modify parameters. The reason for buttons and not knobs, is that the ADC is already completely consumed with the analog audio signal coming in. This is a more focused version of our basic Arduino PWM setup, targetted at effects pedals.
The follow schematic is the basic version to get started. There will eventually be a better version with a dual opamp, and gain, mix, feedback, and level knobs. But that might take a bit to finish.