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#DonLucElectronics #DonLuc #MQ135 #AHT20 #Environment #FireBeetle2ESP32E #ESP32 #Display #IoT #Project #Fritzing #Programming #Electronics #Microcontrollers #Consultant
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MQ-135 Gas Sensor
They are used in air quality control equipments for buildings. offices, home, etc, are suitable for detecting of NH3, NOx, Alcohol, Benzene, Smoke, CO2, Etc…
The sensor itself is enclosed in two layers of stainless steel mesh which ensures that the internal heating element does not cause an explosion since there may be flammable gases present in its working environment, and it also filters suspended particles so that only gases enter the chamber.
DL2605Mk03
1 x DFRobot FireBeetle 2 ESP32-E
1 x Fermion: 3.5” 480×320 TFT LCD Capacitive
1 x GDL Line 10 CM
1 x MQ-135 Gas Sensor
1 x Gravity: AHT20 Temperature and Humidity Sensor
1 x Gravity: IO Shield for FireBeetle 2
1 x Terminal Block Board for FireBeetle 2 ESP32-E IoT
1 x Lithium Ion Battery – 1000mAh
1 x USB 3.0 to Type-C Cable
DL2605Mk03p
DL2605Mk03p.ino
/****** Don Luc Electronics © ******
Software Version Information
Project #15: Environment - MQ-135 Gas Sensor - Mk40
15-40
DL2605Mk03p.ino
DL2605Mk03
1 x DFRobot FireBeetle 2 ESP32-E
1 x Fermion: 3.5” 480x320 TFT LCD Capacitive
1 x GDL Line 10 CM
1 x MQ-135 Gas Sensor
1 x Gravity: AHT20 Temperature and Humidity Sensor
1 x Gravity: IO Shield for FireBeetle 2
1 x Terminal Block Board for FireBeetle 2 ESP32-E IoT
1 x Lithium Ion Battery - 1000mAh
1 x USB 3.0 to Type-C Cable
*/
// Include the Library Code
// EEPROM Library to Read and Write EEPROM with Unique ID for Unit
#include "EEPROM.h"
// DFRobot Display GDL API
#include <DFRobot_GDL.h>
// AHT20 Humidity and Temperature Sensor
#include <DFRobot_AHT20.h>
// MQ-135 Gas Sensor
#include <MQ135.h>
// MQ-135 Gas Sensor
int iMQ135 = A0;
int iValMQ135 = 0;
// AHT20 Humidity and Temperature Sensor
DFRobot_AHT20 aht20;
// AHT20 Humidity and Temperature Sensor
float h = 0;
float t = 0;
// Defined ESP32
#define TFT_DC D2
#define TFT_CS D6
#define TFT_RST D3
/*dc=*/ /*cs=*/ /*rst=*/
// DFRobot Display 320x480
DFRobot_ILI9488_320x480_HW_SPI screen(TFT_DC, TFT_CS, TFT_RST);
// Software Version Information
// EEPROM Unique ID Information
#define EEPROM_SIZE 64
String uid = "";
// Software Version Information
String sver = "15-40";
void loop() {
// isMQ135
isMQ135();
// AHT20 Humidity and Temperature Sensor
isHT();
// isDisplay MQ-135
isDisplayMQ135();
// Delay 2 Second
delay( 2000 );
}
getDisplay.ino
// DFRobot Display 320x480
// DFRobot Display 320x480 - UID
void isDisplayUID(){
// DFRobot Display 320x480
// Text Display
// Text Wrap
screen.setTextWrap(false);
// Rotation
screen.setRotation(3);
// Fill Screen => black
screen.fillScreen(0x0000);
// Text Color => white
screen.setTextColor(0xffff);
// Font => Free Sans Bold 12pt
screen.setFont(&FreeSansBold12pt7b);
// TextSize => 1.5
screen.setTextSize(1.5);
// Don Luc Electronics
screen.setCursor(0, 30);
screen.println("Don Luc Electronics");
// Tilt Switch
screen.setCursor(0, 60);
screen.println("MQ-135 Gas Sensor");
// Version
screen.setCursor(0, 90);
screen.println("Version");
screen.setCursor(0, 120);
screen.println( sver );
// EEPROM
screen.setCursor(0, 150);
screen.println("EEPROM");
screen.setCursor(0, 180);
screen.println( uid );
}
// isDisplay MQ135
void isDisplayMQ135(){
// DFRobot Display 320x480
// Text Display
// Text Wrap
screen.setTextWrap(false);
// Rotation
screen.setRotation(3);
// Fill Screen => white
screen.fillScreen(0xffff);
// Text Color => blue
screen.setTextColor(0x001F);
// Font => Free Sans Bold 12pt
screen.setFont(&FreeSansBold12pt7b);
// TextSize => 1.5
screen.setTextSize(1.5);
// Vibration Senso
screen.setCursor(0, 30);
screen.println("MQ-135 Gas Sensor");
// Humidity
screen.setCursor(0, 70);
screen.println("Humidity");
screen.setCursor(0, 100);
screen.print( h );
screen.setCursor(65, 100);
screen.println( "%RH" );
// Temperature
screen.setCursor(0, 140);
screen.println("Temperature");
screen.setCursor(0, 170);
screen.print( t );
screen.setCursor(65, 170);
screen.println( "C" );
// MQ7 Carbon Monoxide
screen.setCursor(0, 210);
screen.println("MQ-135 Gas Sensor");
screen.setCursor(0, 240);
screen.print( iValMQ135 );
screen.setCursor(65, 240);
screen.println( "ppm" );
}
getEEPROM.ino
// isUID EEPROM Unique ID
void isUID()
{
// Is Unit ID
uid = "";
for (int x = 0; x < 7; x++)
{
uid = uid + char(EEPROM.read(x));
}
}
getgetHT.ino
// AHT20 Humidity and Temperature Sensor
void isHT(){
if(aht20.startMeasurementReady(true)){
// Humidity
h = aht20.getHumidity_RH();
// Temperature
t = aht20.getTemperature_C();
}
}
ggetMQ135.ino
// MQ135
// isMQ135
void isMQ135(){
iValMQ135 = analogRead( iMQ135 );
}
setup.ino
// Setup
void setup()
{
// Delay
delay( 100 );
// EEPROM Size
EEPROM.begin(EEPROM_SIZE);
// EEPROM Unique ID
isUID();
// Delay
delay(100);
// DFRobot Display 320x480
screen.begin();
// Delay
delay( 100 );
// AHT20 Humidity and Temperature Sensor
aht20.begin();
// Delay
delay( 100 );
// DFRobot Display 320x480 - UID
// Don Luc Electronics
// Version
// EEPROM
isDisplayUID();
// Wait for the sensor to heat up for 20 seconds
delay( 20000 );
}
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