Pitch Changer
Version 1.2 For Arduino IDE 1.8.13 ESP-32 / i2s protocol / DMA background transfer Read audio from i2s ADC (DIGILENT Pmod I2S2) into buffer Highpass filter 300Hz /remove rumble Pitch shift Write audio using i2s to DAC (DIGILENT Pmod I2S2)
Version 2.2 Rotary encoder to change the pitch live. Hardware Interrupt and run at 2nd Core.
Version 3.1 Add a small OLED display. 128x32 pixel. I2C interface. Shows Pitch and peak level with memory