In this project, I've interfaced DHT11 with Arduino and then sending data of DHT11 which is humidity and temperature to phpmyadmin database.

The number of unread emails and the hour on a 16x2 LCD display.

This project makes a thermometer using a thermistor.

Do you know the MQTT protocol? Use this with Cayenne. Build your project and use a free cloud platform with Dashboard and many Widgets.