Bankable-Smart-Control-Change-Potentiometer.ino

Bankable-Smart-Control-Change-Potentiometer

This example introduces smart bankable potentiometers to prevent values jumping around when changing banks.

Boards: 🛈

AVR, AVR USB, Nano Every, Due, Nano 33 IoT, Nano 33 BLE, UNO R4, Pi Pico, Teensy 3.x, ESP32, ESP8266

Connections

• A0: wiper of a potentiometer
• 2: momentary push button (other pin to ground)
• 3: momentary push button (other pin to ground)

Connect the left terminal of the potentiometer to ground, and the right one to V_CC.
The internal pull-up resistors for the push buttons will be enabled.

Behavior

If you move the potentiometer to, say, 60%, then switch to bank #2, move the potentiometer to 20%, and then switch back to bank #1, the potentiometer will be disabled, until you move it up to 60% again.

This prevents values jumping around in your DAW when cycling through the different banks.

Changing banks is done using the two push buttons. The push button on pin 2 increments the bank number, the push button on pin 3 decrements the bank number.

Mapping

Select the Arduino as a custom MIDI controller in your DAW, and use the MIDI learn option to assign the potentiometer to a function, change the
bank using the buttons, and map the potentiometer again. It will send the MIDI Control Change Channel Volume parameter for channels 1, 2, 3 and 4 (for banks #1, #2, #3 and #4 respectively).

Written by PieterP, 2020-04-09
https://github.com/tttapa/Control-Surface

 
#include <Control_Surface.h> // Include the Control Surface library
 
// Instantiate a MIDI over USB interface.
USBDebugMIDI_Interface midi;
 
// Four banks to change the channel of the potentiometer
Bank<4> bank;
 
// Selector to change banks
IncrementDecrementSelector<4> selector {bank, {2, 3}};
 
// Handy type alias
using CCSmartPot = Bankable::CCSmartPotentiometer<4>;
 
// Instantiate a CCPotentiometer object
CCSmartPot potentiometer {
  {bank, BankType::ChangeChannel},      // Bank configuration
  A0,                                   // Analog pin connected to potentiometer
  {MIDI_CC::Channel_Volume, Channel_1}, // Channel volume of channel 1
};
 
/*
 * You can do the same for PBSmartPotentiometers (Pitch Bend)
 * 
 * // Handy type alias
 * using  PBSmartPot = Bankable::PBSmartPotentiometer<4>;
 *
 * // Instantiate a CCPotentiometer object
 * PBSmartPot potentiometer {
 *   {bank, BankType::ChangeChannel},     // Bank configuration
 *   A0,                                   // Analog pin connected to potentiometer
 *   Channel_1,                            // Channel 1
 * };
 */
 
void setup() {
  Control_Surface.begin(); // Initialize Control Surface
}
 
void loop() {
  Control_Surface.loop(); // Update the Control Surface
 
  // You can request the state of the smart potentiometer:
  if (potentiometer.getState() == CCSmartPot::Lower) {
    // Turn on an LED to indicate that the potentiometer
    // value is too low to be active
  } else if (potentiometer.getState() == CCSmartPot::Higher) {
    // Turn on an LED to indicate that the potentiometer
    // value is too high to be active
  }
}