v2 of hxsMidiSwitcher - This time with touchscreen and expression pedal input
Still in the very early stages of how to go about this, so doubtless lots will change. That said, it's complete enough that my prototype unit is functional enough for me to use. Now I know I can make it work, I need to go back over it all and restructure the code so that it's less of a shambles.
At the moment the touchscreen is primarily to cycle between preset pages, but you can also tap the button labels to trigger a single press action.
The physical footswitches are working and sending midi messages over to the stomp. Expression pedal and toeswitch is working fairly well... I'm currently using a slightly modified crybaby wah with the circuit board removed, and a TRS jack connected to the potentiometer/toeswitch harness... Not ideal as it's a log pot rather than a linear one but with some software compensation it seems good enough for now.
- Switch layout: [0 1 2 3] [4 5 6 7]
- Combo press (all pages) -- 0+4 - Preset Down -- 3+7 - Preset Up -- 6+7 - Tuner -- 0+1 - switcher Page Down -- 2+3 - switcher Page Up
- Long Press (all pages) -- 3 - Tuner
- Touchscreen -- << and >> buttons cycle between preset pages -- Footswitch labels update as preset page changes -- Touching the footswitch label triggers a FS short click action for that switch
- Midi -- PC / CC messages -- macro of several messages sent in a chain (needed for preset up/down functionality without relying on FS4/FS5 being dedicated to it in the Stomp global settings)
- Expression pedal -- Converts resistance from 100kOhm log pot to MIDI byte -- Sends to Stomp as either EXP1, EXP2 or both -- Checks for changes in latching toeswitch & sends FS5 to Stomp
- switch preset page from footswitches
- toggle mode (FS function & label changes to next in list after press) - see looper Fwd/Rev and Full/Half speed for an example
- Refactor the code so it plays nicely in VSCode - it doesn't seem to like multiple .ino files
- Move current_millis declaration from global to local in whichever functions need it. (exp_pedal.ino)
- Move other exp pedal variables to static within functions where possible
- Rename MidiMessage/MidiMessageToggler/MidiNullMessage to FootswitchAction*
- Programming screen on nextion & associated code on arduino
- Ability to save/load custom programs to/from eeprom
- Document the calculations for the expression pedal log pot compensation
- Document the wiring adapter for the wah pedal to expression pedal conversion.
- configurable for log/lin EXP pedal pots
- configurable for TRS pedal pot type input or TS + voltage divider style
- configurable for latching/momentary toeswitch
- configurable for +5v toeswitch with external pulldown, or GND toeswitch with internal pullup
- All the other stuff I can't remember at the moment or haven't thought of yet
- power capacitor needed for nextion screen? seems OK without.. will see if it holds up
- activate long press/double FS actions from touchscreen
- USB host midi capability - to be able to control Zoom B3/G3n/MS60B type pedals etc
- extra MIDI in/out ports
- bluetooth
- self-hovering