CO2Ampel.ino

#include "esp_timer.h"
#include <Wire.h>
#include <FastLED.h>

// Go to TTGO T-Display's Github Repository
// Download the code as zip, extract it and copy the Folder TFT_eSPI
//  => https://github.com/Xinyuan-LilyGO/TTGO-T-Display/archive/master.zip
// to your Arduino library path
#include <TFT_eSPI.h>
#include <SPI.h>

// Download the SeeedStudio SCD30 Arduino driver here:
//  => https://github.com/Seeed-Studio/Seeed_SCD30/releases/latest
#include "SCD30.h"

#include "Sensirion_GadgetBle_Lib.h"

#define SDA_pin 26  // Define the SDA pin used for the SCD30
#define SCL_pin 27  // Define the SCL pin used for the SCD30
#define DATA_PIN 21
#define CLOCK_PIN 22
#define NUM_LEDS 4
CRGB leds[NUM_LEDS];

static int64_t lastMmntTime = 0;
static int startCheckingAfterUs = 1900000;

GadgetBle gadgetBle = GadgetBle(GadgetBle::DataType::T_RH_CO2_ALT);

// Display related
#define SENSIRION_GREEN 0x6E66
#define sw_version "v1.0"

#define GFXFF 1
#define FF99  &SensirionSimple25pt7b
#define FF90  &ArchivoNarrow_Regular10pt7b
#define FF95  &ArchivoNarrow_Regular50pt7b

TFT_eSPI tft = TFT_eSPI(135, 240); // Invoke library, pins defined in User_Setup.h

void displayInit() {
  tft.init();
  tft.setRotation(1);
}

void displaySplashScreen() {
  tft.fillScreen(TFT_WHITE);
  tft.setTextColor(SENSIRION_GREEN, TFT_WHITE);

  uint8_t defaultDatum = tft.getTextDatum();
  tft.setTextDatum(1); // Top centre

  tft.setTextSize(1);
  tft.setFreeFont(FF99);
  tft.drawString("B", 120, 40);

  tft.setTextSize(1);
  tft.drawString(sw_version, 120, 90, 2);

  // Revert datum setting
  tft.setTextDatum(defaultDatum);
}

void displayCo2(uint16_t co2) {
  if (co2 > 9999) {
    co2 = 9999;
  }

  tft.fillScreen(TFT_BLACK);

  uint8_t defaultDatum = tft.getTextDatum();

  tft.setTextSize(1);
  tft.setFreeFont(FF90);
  tft.setTextColor(TFT_WHITE, TFT_BLACK);

  tft.setTextDatum(6); // bottom left
  tft.drawString("CO2", 10, 125);

  tft.setTextDatum(8); // bottom right
  tft.drawString(gadgetBle.getDeviceIdString(), 230, 125);

  // Draw CO2 number
  if (co2 < 9999){
   if (co2 >= 2000 ) {
    tft.setTextColor(TFT_RED, TFT_BLACK);
    for (int i=0; i< NUM_LEDS; i++){
     leds[i] = CRGB::Red;  
    }
    FastLED.show();
    delay(500);
    for (int i=0; i< NUM_LEDS; i++){
     leds[i] = CRGB::Black;  
    }
    FastLED.show();
   }
   else if (co2 >= 1600 ) {
    tft.setTextColor(TFT_RED, TFT_BLACK);
    for (int i=0; i< NUM_LEDS; i++){
     leds[i] = CRGB::Red;  
    }
    FastLED.show();
  } else if (co2 >= 1000 ) {
    tft.setTextColor(TFT_ORANGE, TFT_BLACK);
    for (int i=0; i< NUM_LEDS; i++){
     leds[i] = CRGB::Orange;  
    }
    FastLED.show();
  } else {
    tft.setTextColor(TFT_GREEN, TFT_BLACK);
    for (int i=0; i< NUM_LEDS; i++){
     leds[i] = CRGB::Green;  
    }
    FastLED.show();
  }
  }
  tft.setTextDatum(8); // bottom right
  tft.setTextSize(1);
  tft.setFreeFont(FF95);
  tft.drawString(String(co2), 195, 105);

  // Draw CO2 unit
  tft.setTextSize(1);
  tft.setFreeFont(FF90);
  tft.drawString("ppm", 230, 90);

  // Revert datum setting
  tft.setTextDatum(defaultDatum);
}

void setup() {
  Serial.begin(115200);
  delay(100);

  // Initialize the GadgetBle Library
  gadgetBle.begin();
  Serial.print("Sensirion GadgetBle Lib initialized with deviceId = ");
  Serial.println(gadgetBle.getDeviceIdString());

  // Initialize the SCD30 driver
  Wire.begin(SDA_pin, SCL_pin);
  scd30.initialize();
  scd30.setAutoSelfCalibration(1);

  FastLED.addLeds<APA102, DATA_PIN, CLOCK_PIN, BGR>(leds, NUM_LEDS);

  // Display init and splash screen
  displayInit();
  displaySplashScreen();
  // Enjoy the splash screen for 2 seconds
  delay(2000);
}

void loop() {
  float result[3] = {0};

  if (esp_timer_get_time() - lastMmntTime >= startCheckingAfterUs) {

    if (scd30.isAvailable()) {
      scd30.getCarbonDioxideConcentration(result);

      gadgetBle.writeCO2(result[0]);
      gadgetBle.writeTemperature(result[1]);
      gadgetBle.writeHumidity(result[2]);

      gadgetBle.commit();
      lastMmntTime = esp_timer_get_time();

      // Provide the sensor values for Tools -> Serial Monitor or Serial Plotter
      Serial.print("CO2[ppm]:");
      Serial.print(result[0]);
      Serial.print("\t");
      Serial.print("Temperature[℃]:");
      Serial.print(result[1]);
      Serial.print("\t");
      Serial.print("Humidity[%]:");
      Serial.println(result[2]);

      // display CO2 value
      displayCo2((uint16_t) std::round(result[0]));
    }
  }

  gadgetBle.handleEvents();
  delay(3);
}