Air Quality SCD40センサー関連データ取得

#include <M5Unified.h>
#include <Wire.h>
#include <SensirionI2CScd4x.h>

SensirionI2CScd4x scd4x;

void setup() {
  Serial.begin(115200);

  // Initialize the screen
  M5.begin();
  M5.Display.clear(TFT_BLACK);
  M5.Display.setTextSize(1);
  M5.Display.setTextColor(TFT_WHITE, TFT_BLACK);

  // Initialize I2C bus (SDA=11, SCL=12)
  Wire.begin(11, 12);
  scd4x.begin(Wire);

  uint16_t err;
  char errMsg[128];
  err = scd4x.stopPeriodicMeasurement();
  if (err) {
    Serial.print("stopPeriodicMeasurement error: ");
    errorToString(err, errMsg, sizeof(errMsg));
    Serial.println(errMsg);
  }

  // Start periodic measurement (default interval 2 s)
  err = scd4x.startPeriodicMeasurement();
  if (err) {
    Serial.print("startPeriodicMeasurement error: ");
    errorToString(err, errMsg, sizeof(errMsg));
    Serial.println(errMsg);
  }

  // Wait for the first data to stabilize
  delay(5000);
}

void loop() {
  // Refresh every two seconds
  delay(2000);

  uint16_t err;
  bool ready = false;
  char errMsg[128];

  // Check if data is ready
  err = scd4x.getDataReadyFlag(ready);
  if (err) {
    Serial.print("getDataReadyFlag error: ");
    errorToString(err, errMsg, sizeof(errMsg));
    Serial.println(errMsg);
    return;
  }
  if (!ready) {
    // Skip if not ready
    return;
  }

  // Read CO₂ / temperature / humidity
  uint16_t co2;
  float temp, hum;
  err = scd4x.readMeasurement(co2, temp, hum);
  if (err) {
    Serial.print("readMeasurement error: ");
    errorToString(err, errMsg, sizeof(errMsg));
    Serial.println(errMsg);
  }

  // Print results to Serial
  if (!err && co2) {
    Serial.printf("CO2=%uppm  Temp=%.1f°C  Hum=%.1f%%\n", co2, temp, hum);
  }

  // Display results on AirQ screen
  M5.Display.fillScreen(TFT_BLACK);
  M5.Display.setCursor(10,  10);
  if (err || co2 == 0) {
    M5.Display.setTextColor(TFT_RED, TFT_BLACK);
    M5.Display.println("Read failed");
  } else {
    M5.Display.setTextColor(TFT_WHITE, TFT_BLACK);
    M5.Display.printf("CO2   : %4uppm\n", co2);
    M5.Display.printf("Temp  : %5.1f°C\n", temp);
    M5.Display.printf("Hum   : %5.1f%%\n", hum);
  }

  M5.update();
}