M5StickC + PIR Hatによる手洗い30秒のための非接触タイマー

wash-timer.ino

#include <M5StickC.h>

#define PIR_PIN 36
#define PIR_DETECTION_DELAY_MSEC 2000

#define FILL_MSEC  500
#define TIMER_MSEC 30000

bool startTimer(unsigned long ms) {
  for (int y = M5.Lcd.height() - 1; y >= 0; --y) {
    M5.Lcd.drawLine(0, y, M5.Lcd.width() - 1, y, TFT_BLUE);
    delay(FILL_MSEC / M5.Lcd.height());
  }

  for (int y = 0; y < M5.Lcd.height(); ++y) {
    M5.Lcd.drawLine(0, y, M5.Lcd.width() - 1, y, TFT_BLACK);
    delay(TIMER_MSEC / M5.Lcd.height());
    M5.update();
    if (M5.BtnA.wasPressed()) { // Cancel Timer
      return false;
    }
  }
  return true;
}

void setup() {
  M5.begin();
  M5.Lcd.setRotation(2);
  M5.Lcd.fillScreen(TFT_BLACK);

  pinMode(M5_LED, OUTPUT);
  digitalWrite(M5_LED, HIGH);
  pinMode(PIR_PIN, INPUT_PULLUP);
}

void loop() {
  if (digitalRead(PIR_PIN) == HIGH) {
    if (startTimer(TIMER_MSEC)) {
      digitalWrite(M5_LED, LOW);
      delay(1000);
      digitalWrite(M5_LED, HIGH);
    } else {
      M5.Lcd.fillScreen(TFT_BLACK);
      delay(PIR_DETECTION_DELAY_MSEC);
    }
  }
}