MIDI Footswitch with ESP32

Features

• Uses ESP32 as the brains
• Built with PlatformIO, Arduino framework
• 3 digit 7-segment LED display for bank-program & BPM display
• 0.96" OLED screen for bank-program name & additional functions
• 2 duplicated MIDI outputs
• 4 fixed footswitches
• 4 fixed LEDs
• 2 external input jacks for 2-4 additional switches
• 2 expression pedal inputs
• Send any MIDI command via footswitches or expression
• Presets are saved up to 9 banks in 4 (36 in total)
• Send MIDI clock (Tap tempo on switch 7)

Todo List

• Onboard preset editing
• Add a rotary encoder for additional functions (may need pcb change)
• Move presets into NVS with Preferences Library
• Set repeat press events for bank change buttons
• OTA update
• Web based config
• OLED improvements, show more information on screen
• Dual core optimizations (Currently MIDI Clock handling runs on separate core, but hacky)
• Move LEDS / Switches to a shift register (not a priority, ESP32 has enough GPIO)

3rd Party Libraries

• Arduino MIDI Library: General MIDI functionality
• AceButton: Switch handling
• ShiftRegister 74HC595 Arduino Library: For driving the 7-segment LED display
• Arduino Single EMA Filter: Filtering voltage noise from analog inputs (for expression pedals)
• U8G2: Driving the OLED display