Salman Faris
Published © GPL3+

Air Quality Monitoring Station with Wio Terminal

The Air Quality Terminal can be used as an indoor air quality meter to monitor VOCs, CO, NO2, C2H5CH, Temp and Humidity.

IntermediateFull instructions provided4 hours749
Air Quality Monitoring Station with Wio Terminal

Things used in this project

Hardware components

Seeed Wio Terminal
×1
Seeed Grove - Multichannel Gas Sensor v2
×1

Software apps and online services

Arduino IDE
Arduino IDE

Hand tools and fabrication machines

3D Printer (generic)
3D Printer (generic)

Story

Read more

Custom parts and enclosures

Wio Terminal Stand

Schematics

Air Quality Terminal Architecture

Code

AirQuality-Terminal.ino

C/C++
/*
   Air Quality Terminal 
   Author: Salman Faris
   Date: 01/09/2020
   Last Updates: 06/09/2020
*/


#include <TFT_eSPI.h>
#include <Multichannel_Gas_GMXXX.h>
#include <Wire.h>
#include "DHT.h"

GAS_GMXXX<TwoWire> gas;

TFT_eSPI tft;
TFT_eSprite spr = TFT_eSprite(&tft);  //sprite

unsigned int no2, c2h5ch, voc, co;


#define DHTPIN 0
#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);




void setup() {
  Serial.begin(115200);
  tft.begin();
  tft.setRotation(3);

  gas.begin(Wire, 0x08);

  dht.begin();


  //Head
  tft.fillScreen(TFT_BLACK);
  tft.setFreeFont(&FreeSansBoldOblique18pt7b);
  tft.setTextColor(TFT_WHITE);
  tft.drawString("Air Quality", 70, 10 , 1);

  //Line
  for (int8_t line_index = 0; line_index < 5 ; line_index++)
  {
    tft.drawLine(0, 50 + line_index, tft.width(), 50 + line_index, TFT_GREEN);
  }


  //VCO & CO Rect
  tft.drawRoundRect(5, 60, (tft.width() / 2) - 20 , tft.height() - 65 , 10, TFT_WHITE); // L1

  //VCO Text
  tft.setFreeFont(&FreeSansBoldOblique12pt7b);
  tft.setTextColor(TFT_RED);
  tft.drawString("VOC", 7 , 65 , 1);
  tft.setTextColor(TFT_GREEN);
  tft.drawString("ppm", 55, 108, 1);

  //CO Text
  tft.setFreeFont(&FreeSansBoldOblique12pt7b);
  tft.setTextColor(TFT_RED);
  tft.drawString("CO", 7 , 150 , 1);
  tft.setTextColor(TFT_GREEN);
  tft.drawString("ppm", 55, 193, 1);


  // Temp rect
  tft.drawRoundRect((tft.width() / 2) - 10  , 60, (tft.width() / 2) / 2 , (tft.height() - 65) / 2 , 10, TFT_BLUE); // s1

  tft.setFreeFont(&FreeSansBoldOblique9pt7b);
  tft.setTextColor(TFT_RED) ;
  tft.drawString("Temp", (tft.width() / 2) - 1  , 70 , 1); // Print the test text in the custom font
  tft.setTextColor(TFT_GREEN);
  tft.drawString("o", (tft.width() / 2) + 30, 95, 1);
  tft.drawString("C", (tft.width() / 2) + 40, 100, 1);


  //No2 rect
  tft.drawRoundRect(((tft.width() / 2) + (tft.width() / 2) / 2) - 5  , 60, (tft.width() / 2) / 2 , (tft.height() - 65) / 2 , 10, TFT_BLUE); // s2

  tft.setFreeFont(&FreeSansBoldOblique9pt7b);
  tft.setTextColor(TFT_RED);
  tft.drawString("NO2", ((tft.width() / 2) + (tft.width() / 2) / 2)   , 70 , 1); // Print the test text in the custom font
  tft.setTextColor(TFT_GREEN);
  tft.drawString("ppm", ((tft.width() / 2) + (tft.width() / 2) / 2) + 30 , 120, 1);

  //Humi Rect
  tft.drawRoundRect((tft.width() / 2) - 10 , (tft.height() / 2) + 30, (tft.width() / 2) / 2 , (tft.height() - 65) / 2 , 10, TFT_BLUE); // s3

  tft.setFreeFont(&FreeSansBoldOblique9pt7b);
  tft.setTextColor(TFT_RED) ;
  tft.drawString("Humi", (tft.width() / 2) - 1 , (tft.height() / 2) + 40 , 1); // Print the test text in the custom font
  tft.setTextColor(TFT_GREEN);
  tft.drawString("%", (tft.width() / 2) + 30, (tft.height() / 2) + 70, 1);



  //c2h5ch Rect
  tft.drawRoundRect(((tft.width() / 2) + (tft.width() / 2) / 2) - 5  , (tft.height() / 2) + 30, (tft.width() / 2) / 2 , (tft.height() - 65) / 2 , 10, TFT_BLUE); // s4


  tft.setFreeFont(&FreeSansBoldOblique9pt7b);
  tft.setTextColor(TFT_RED) ;
  tft.drawString("Ethyl", ((tft.width() / 2) + (tft.width() / 2) / 2)   , (tft.height() / 2) + 40 , 1); // Print the test text in the custom font
  tft.setTextColor(TFT_GREEN);
  tft.drawString("ppm", ((tft.width() / 2) + (tft.width() / 2) / 2) + 30 , (tft.height() / 2) + 90, 1);


}

void loop() {

  // VOC

  voc = gas.getGM502B();
  if (voc > 999) voc = 999;
  Serial.print("VOC: ");
  Serial.print(voc);
  Serial.println(" ppm");

  spr.createSprite(40, 30);
  spr.fillSprite(TFT_BLACK);
  spr.setFreeFont(&FreeSansBoldOblique12pt7b);
  spr.setTextColor(TFT_WHITE);
  spr.drawNumber(voc, 0, 0, 1);
  spr.pushSprite(15, 100);
  spr.deleteSprite();

  //CO

  co = gas.getGM702B();
  if (co > 999) co = 999;
  Serial.print("CO: ");
  Serial.print(co);
  Serial.println(" ppm");

  spr.createSprite(40, 30);
  spr.setFreeFont(&FreeSansBoldOblique12pt7b);
  spr.setTextColor(TFT_WHITE);
  spr.drawNumber(co, 0, 0, 1);
  spr.setTextColor(TFT_GREEN);
  spr.pushSprite(15, 185);
  spr.deleteSprite();

  //Temp

  float t = dht.readTemperature();
  //int tem = round(t);
  int tem = t;
  Serial.print("Temperature: ");
  Serial.print(tem);
  Serial.println( "*C");

  spr.createSprite(30, 30);
  spr.setFreeFont(&FreeSansBoldOblique12pt7b);
  spr.setTextColor(TFT_WHITE);
  spr.drawNumber(t, 0, 0, 1);
  spr.setTextColor(TFT_GREEN);
  spr.pushSprite((tft.width() / 2) - 1, 100);
  spr.deleteSprite();

  //NO2
  no2 = gas.getGM102B();
  if (no2 > 999) no2 = 999;
  Serial.print("NO2: ");
  Serial.print(no2);
  Serial.println(" ppm");

  spr.createSprite(45, 30);
  spr.setFreeFont(&FreeSansBoldOblique12pt7b);
  spr.setTextColor(TFT_WHITE);
  spr.drawNumber(no2, 0, 0, 1);
  spr.pushSprite(((tft.width() / 2) + (tft.width() / 2) / 2), 97);
  spr.deleteSprite();


  //Humidity
  float h = dht.readHumidity();
  if (h > 99) h = 99;
  Serial.print("Humidity: ");
  Serial.print(h);
  Serial.println( "%");

  spr.createSprite(30, 30);
  spr.setFreeFont(&FreeSansBoldOblique12pt7b);
  spr.setTextColor(TFT_WHITE);
  spr.drawNumber(h, 0, 0, 1);
  spr.pushSprite((tft.width() / 2) - 1, (tft.height() / 2) + 67);
  spr.deleteSprite();

  //C2H5CH
  c2h5ch = gas.getGM302B();
  if (c2h5ch > 999) c2h5ch = 999;
  Serial.print("C2H5CH: ");
  Serial.print(c2h5ch);
  Serial.println(" ppm");

  spr.createSprite(45, 30);
  spr.setFreeFont(&FreeSansBoldOblique12pt7b);
  spr.setTextColor(TFT_WHITE);
  spr.drawNumber(c2h5ch, 0 , 0, 1);
  spr.pushSprite(((tft.width() / 2) + (tft.width() / 2) / 2), (tft.height() / 2) + 67);
  spr.deleteSprite();


  delay(2000);
}

Credits

Salman Faris

Salman Faris

16 projects • 322 followers
Maker | Hardware Hacker | Electronics Enthusiast

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