Hi @XmayankX,

As far as I remember DHT11's communication protocol is too fast to transmit raw data directly from an arduino board to a java application and analyze the data there. So the only way you can get the readings from DHT11 in a java application using Firmata is to extend the firmware in order to support DHT11 so that the board communicates with a DHT11 unit, gets the readings and send it as some kind of Firmata message to the application.

Please, check this library in order to see if you can integrate it to your Firmata sketch.

Also check this article to draw some inspiration on how you can approach modification of the arduino sketch in order to support DHT11 readings.

If you describe the issue you have encountered in details, probability that someone can help you increases.

With best regards,
Oleg