/*
  MobiFlight Button Test
  Checks 8 push buttons and sends a serial output when any change state.
  "Extra" parts shown as examples of input / output devices.
  Click+CTRL causes a button to remain depressed.
  AnonEngineering 7/23/25
  Beerware
*/

const int NUM_BTNS = 8;
const int BTN_PINS[] = {23, 25, 27, 29, 47, 45, 43, 41};

int btnState[NUM_BTNS];
int oldBtnState[NUM_BTNS];
int btnValues[NUM_BTNS];
int oldBtnValues[NUM_BTNS];

void checkButtons()  {
  for (int i = 0; i < NUM_BTNS; i++) {
    // check each button
    btnState[i] = digitalRead(BTN_PINS[i]);
    if (btnState[i] != oldBtnState[i])  { // if it changed
      oldBtnState[i] = btnState[i];       // remember state for next time
      if (btnState[i] == LOW)  {          // was just pressed
        btnValues[i] = 1;
      } else {
        btnValues[i] = 0;
      }
      delay(20);  // debounce
    }
  }
}

void setup() {
  Serial.begin(115200);
  for (int i = 0; i < NUM_BTNS; i++) {
    pinMode(BTN_PINS[i], INPUT_PULLUP);
  }
  Serial.println("Button demo\n");
}

void loop() {
  checkButtons();
  for (int i = 0; i < NUM_BTNS; i++)  {
    if (btnValues[i] != oldBtnValues[i])  {
      oldBtnValues[i] = btnValues[i];
      Serial.print("PB");
      Serial.print(i);
      Serial.print("=");
      Serial.println(btnValues[i]);
    }
  }
}