arduino使用DHT11监测温湿度MQ135监测co2甲醛通过LCD1602显示

可以使用以下代码实现：

#include <LiquidCrystal.h>
#include <dht.h>

dht DHT;
#define DHT11_PIN 7
#define MQ135_PIN A0

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
lcd.begin(16, 2);
lcd.print("Temp: ");
lcd.setCursor(0, 1);
lcd.print("Humidity: ");
}

void loop() {
int chk = DHT.read11(DHT11_PIN);
float temp = DHT.temperature;
float hum = DHT.humidity;

int sensorValue = analogRead(MQ135_PIN);
float voltage = sensorValue * (5.0 / 1023.0);
float co2 = voltage * 50.0;

lcd.setCursor(6, 0);
lcd.print(temp);
lcd.setCursor(10, 0);
lcd.print("C");

lcd.setCursor(10, 1);
lcd.print(hum);
lcd.setCursor(14, 1);
lcd.print("%");

delay(2000);
}