Introduction
In this post you will use the Android app Serial Bluetooth Terminal by Kai Morich for connecting to your Arduino with Bluetooth and receive serial data from a sensor. It will be like replacing the Arduino IDE terminal window with your Android device.
Get started
Go to Google play store and search for “Serial Bluetooth Terminal”. Install the app on your Andriod device.
Pair
If you now pair your Arduino bluetooth (whether classic of BLE does not matter), your serial output will show up in the Serial Bluetooth Terminal on your phone.