スピーカLEDの制御装置。フットスイッチでOFF、50%ON、100%ONを切り替え。マイコンはESP-WROOM-02。

speaker_led.ino

const uint8_t PIN_PWM         = 12;
const uint8_t PIN_FOOT_SWITCH = 5;

uint8_t countOfSwitchPushed = 0;
uint32_t switchCounterLastUpdatedTime = 0;

void setup() {
  Serial.begin(115200);
  Serial.println("ver2");
  pinMode(PIN_PWM,         OUTPUT);
  pinMode(PIN_FOOT_SWITCH, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(PIN_FOOT_SWITCH), updateSwitchCounter, FALLING);

  switchCounterLastUpdatedTime = millis();
}

void loop() {
  uint16_t value = 0;
  switch ( countOfSwitchPushed % 3 ) {
    case 0: value =    0; break;
    case 1: value =  511; break;
    case 2: value = 1023; break;
  }
  analogWrite(PIN_PWM, value);
  delay(50);
}

void updateSwitchCounter() {
  const uint32_t now = millis();
  if ( now - switchCounterLastUpdatedTime > 100 ) {
    countOfSwitchPushed++;
  }
  switchCounterLastUpdatedTime = now;
}