Arduino MQ2 Gas Sensor & DHT11

Linh kiện: Arduino Uno, Dht11, Lm016L, LogicState, Mq-2 gas sensor, res.

Proteus:

Arduino IDE:

Cài Lib: LiquidCrystal

#include <DHT.h>

#include <LiquidCrystal.h>

DHT dht(8, DHT11);

LiquidCrystal lcd(7, 6 , 5, 4, 3, 2);

float gas_sensor = A0;

void setup() {

// put your setup code here, to run once:

lcd.begin(16, 2);

lcd.print("Hello");

lcd.setCursor(0, 1);

lcd.print("DHT11 + MQ2");

delay(2000);

Serial.begin(9600);

dht.begin();

}

void loop() {

// put your main code here, to run repeatedly:

float nhietdo = dht.readTemperature();

float doam = dht.readHumidity();

float gas = map(analogRead(gas_sensor), 0, 1023, 200, 10000);

Serial.println();

Serial.print("Do am:");

Serial.print(doam);

Serial.print("% ");

Serial.print("Nhiet do: ");

Serial.print(nhietdo);

Serial.print("*C");

lcd.clear();

lcd.print("T: ");

lcd.print(nhietdo);

lcd.print(" *C H:");

lcd.print(doam);

lcd.print("%");

lcd.setCursor(0, 1);

lcd.print("Nong do gas: ");

lcd.print(gas);

lcd.print("ppm");

delay(1000);

}