#define DHT_NODE_ADDRESS 1 // I2C address of the DHT22 slave module
#include <Wire.h> 
#include <DHTStable.h>

#define DHTPIN 4  // DHT connected to ATtiny412 pin 4 (PA3)
#define DHTTYPE DHT22   // DHT 22  (AM2302)

DHTStable DHT; // initialize the DHT library

// Initialize the humidity and temperature variables
int humidity = 0;
int temperature = 0;

void setup()
{
  Wire.begin(DHT_NODE_ADDRESS); // join i2c bus with defined address
  Wire.onRequest(requestEvent); // register event
}
   
void loop()
{
  DHT.read22(DHTPIN); // Read DHT22 data. 
  
  temperature  = DHT.getTemperature();
  humidity = DHT.getHumidity();

  delay(2000); /* Add 2 second delay in the loop */
}

void requestEvent() {
  Wire.write(temperature); // respond with message of 4 bytes
  Wire.write(humidity);    // respond with message of 4 bytes
}