Multiple Ladders?

[h-c-c]

Hi and thanks for AceButton! Does it support multiple ladders - like
multiple analog pins being read? Unfortunately, my application
doesn't lend itself to a matrix.

[bxparks]

In theory, LadderButtonConfig can handle as many analog pins as available. In practice, I have never tested this, so who knows what weird issues that you will come across.

The basic idea is to create 2 (or more) instances of LadderButtonConfig, each responsible for decoding the voltage level of one analog pin. You then have 2 sets of buttons, each of them having their own virtual pin numbers (e.g. from 0 to 7). You will probably want to create multiple event handlers (i.e. the handleEvent() function, or instances of the IHandleEvent interface), because you won't be able to distinguish 2 buttons with the same pin from 2 different LadderButtonConfig.

(Edit: Actually, if you use the id parameter of AceButton, and give each of your button a unique id, then you can get away with using just a single button handler`)

Once you set up the 2 LadderButtonConfig, the 2 sets of buttons, and 2 handleEvent() functions, you will configure the pins for analog input. So you will duplicate most of the code given in https://github.com/bxparks/AceButton/blob/develop/docs/resistor_ladder/README.md:

// create buttons for Ladder 1
uint8_t ANALOG_PIN1 = ...;
AceButton b0(nullptr, 0);
AceButton b1(nullptr, 1);
AceButton b2(nullptr, 2);
AceButton * const BUTTONS1[] = { &b0, &b1, &b2, ... };
const uint16_t LEVELS1[] = { ... }
LadderButtonConfig buttonConfig1(ANALOG_PIN1, NUM_LEVELS1, LEVELS1, NUM_BUTTONS1, BUTTONS1);

// create buttons for Ladder 2
uint8_t ANALOG_PIN2 = ...;
AceButton c0(nullptr, 0);
AceButton c1(nullptr, 1);
AceButton c2(nullptr, 2);
AceButton * const BUTTONS2[] = { &c0, &c1, &c2, .... };
const uint16_t LEVELS2[] = { ... }
LadderButtonConfig buttonConfig2(ANALOG_PIN2, NUM_LEVELS2, LEVELS2, NUM_BUTTONS2, BUTTONS2);

// Define the event handlers.
void handleEvent1(...) {....}
void handleEvent2(...) {...}

void setup() {
  ...
  pinMode(ANALOG_PIN1, INPUT);
  pinMode(ANALOG_PIN2, INPUT);

  buttonConfig1.setEventHandler(handleEvent1);
  buttonConfig2.setEventHandler(handleEvent2);
  ...

  buttonConfig1.setFeature(...);
  buttonConfig2.setFeature(...);
  ...
}

void checkButtons() {
  static unsigned long prev = millis();

  // DO NOT USE delay(5) to do this.
  unsigned long now = millis();
  if (now - prev > 5) {
    buttonConfig1.checkButtons();
    buttonConfig2.checkButtons();
    prev = now;
  }
}

void loop() {
  checkButtons();
}

[h-c-c]

Thanks, I'll give it a shot!