mz_co2ampel.ino

/***************************************************************************
  This is a library for the sensirion SCD30 CO2, humidity, temperature

  These sensors use I2C or SPI to communicate, 2 or 4 pins are required
  to interface.

  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing products
  from Adafruit!

  Written by Limor Fried & Kevin Townsend for Adafruit Industries.
  BSD license, all text above must be included in any redistribution
  
  this one uses the TTGO V1 LoRawan ESP32
 ***************************************************************************/

#include <Wire.h>

#include "SparkFun_SCD30_Arduino_Library.h" //Click here to get the library: http://librarymanager/All#SparkFun_SCD30
SCD30 airSensor;

#include <Adafruit_NeoPixel.h>
#define PIN 23 //connect neopixel here

// Parameter 1 = number of pixels in strip
// Parameter 2 = Arduino pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
//   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
//   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
//   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
//   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
//   NEO_RGBW    Pixels are wired for RGBW bitstream (NeoPixel RGBW products)
Adafruit_NeoPixel strip = Adafruit_NeoPixel(11, PIN, NEO_GRB + NEO_KHZ800);

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

  Wire.begin();

  airSensor.begin();

  delay(5000);

  strip.begin();
  strip.setBrightness(64);
  strip.show(); // Initialize all pixels to 'off'
  
}

void loop() {

  if (airSensor.dataAvailable())
  {
    Serial.print("co2(ppm):");
    Serial.print(airSensor.getCO2());

    Serial.print(" temp(C):");
    Serial.print(airSensor.getTemperature(), 1);

    Serial.print(" humidity(%):");
    Serial.print(airSensor.getHumidity(), 1);

    Serial.println();

    int ppm=airSensor.getCO2();
    int c;
    
    if (ppm>2000) { c=strip.Color(255,0,0); }
    if (ppm>1000 && ppm<2000) { c=strip.Color(200,150,0); }
    if (ppm<1000) { c=strip.Color(0,255,0); }    

    int ct=map(ppm, 0, 2000, 1, 11);

    for(uint16_t i=0; i<strip.numPixels(); i++) {
      if (i<=ct) {
        strip.setPixelColor(i, c);
      } else {
        strip.setPixelColor(i, strip.Color(0,0,0));
      }
    }
    strip.show();    
    
  } else {
    Serial.println("Waiting for new data");
    delay(500);
  }
  
  delay(2000);
}