【超簡単電子工作】M5StackとCO2センサで自室のCO2濃度を測定してみた！

/*----------------------------------------------------------
    MH-Z19 CO2 sensor  SAMPLE
  ----------------------------------------------------------*/
#include <M5Stack.h>
#include <MHZ19_uart.h>

#define ARDUINO_ARCH_ESP32
#define PERIOD 60
#define THPPM 1000

const int rx_pin = 16;	//Serial rx pin no
const int tx_pin = 17;	//Serial tx pin no

MHZ19_uart mhz19;

/*----------------------------------------------------------
    MH-Z19 CO2 sensor  setup
  ----------------------------------------------------------*/
void setup() {
  M5.begin();
  delay(100);
  Serial.println("Hello");
  mhz19.begin(rx_pin, tx_pin, 2);
  mhz19.setAutoCalibration(false);

  M5.Lcd.setTextSize(3);
  M5.Lcd.setCursor(20,120);
  M5.Lcd.clear();
  M5.Lcd.setBrightness(50);
}

/*----------------------------------------------------------
    MH-Z19 CO2 sensor  loop
  ----------------------------------------------------------*/
void loop() {
  unsigned long startt = millis(); // loopの開始時刻を記録
  int co2ppm = mhz19.getPPM();
  int temp = mhz19.getTemperature();
  Serial.print("co2: "); Serial.println(co2ppm);
  Serial.print("temp: "); Serial.println(temp);
  M5.Lcd.clear();
  M5.Lcd.setTextSize(10);
  M5.Lcd.setCursor(20,120);
  M5.Lcd.printf("%dppm\n", (int)co2ppm);
  M5.Lcd.setTextSize(2);
  M5.Lcd.setCursor(20,0);
  delay(PERIOD*1000);
}