Hi Pearllpy,
I just started using the Arduino Uno and have done a couple easy and small projects with the HC-05 Bluetooth module (ZS-040).
The basic functionality for getting information from the HC-05 BT Module to your smartphone comes from different smartphone apps that essentially turn your smartphone into a Bluetooth Terminal. Then, your Arduino code directs the information to the "Serial" connection, which is really just the Bluetooth terminal.
In the attached example (which I documented pretty well), I have a Temperature and Humidity sensor sending information to my smartphone via the HC-05 BT module.
Hope it helps.
-noegoeo
BT_TEMP_SENSOR.ino (4.96 KB)
