Arduino DH22 I2C LCD
// Example testing sketch for various DHT humidity/temperature sensors
// Written by ladyada, public domain
#include "DHT.h"
#include
#include
LiquidCrystal_I2C lcd(0x27,16,2);
#define DHTPIN 2
// what pin we're connected to
// Uncomment whatever type you're using!
//#define DHTTYPE DHT11 // DHT 11
#define DHTTYPE DHT22 // DHT 22 (AM2302)
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
// Connect pin 1 (on the left) of the sensor to +5V
// Connect pin 2 of the sensor to whatever your DHTPIN is
// Connect pin 4 (on the right) of the sensor to GROUND
// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
DHT dht(DHTPIN, DHTTYPE);
void setup()
{
lcd.init();
lcd.backlight();
Serial.begin(9600);
//Serial.println("DHTxx test!");
dht.begin();
}
void loop()
{
// Reading temperature or humidity takes about 250 milliseconds!
// Sensor readings may also be up to A0 seconds 'old' (its a very slow sensor)
float h = dht.readHumidity();
// float h_ver=h+10;
float t = dht.readTemperature();
// check if returns are valid, if they are NaN (not a number) then something went wrong!
if (isnan(t) || isnan(h))
{
lcd.setCursor(0, 0);
lcd.print("Read data failed");
}
else
{
lcd.setCursor(0, 0);
lcd.print("Temp: ");
lcd.print(t);
lcd.print(" *C");
lcd.setCursor(0, 1);
lcd.print("R.H.: ");
lcd.print(h);
//lcd.print(h_ver);
lcd.print(" %");
delay(500);
}
}
