chungyenlai / android-arduino-bluetooth

Demo of a clear and simple way to interface Android and Arduino over a Bluetooth connection

android-arduino-bluetooth

Demo of a clean and robust way to interface Android and Arduino devices over a Bluetooth connection.

Features:

• Bluetooth using SoftwareSerial on Arduino
• Separate thread for Bluetooth RX/TX in Android
• Basic UI for connecting, disconnecting, reading, and writing
• Exception handling for failed connections
• Parsing of complete messages using a delimiter character
• Forwarding of messages from USB serial to bluetooth on Arduino
• Lots of comments

Requirements:

• Android device with Bluetooth enabled.
• Arduino with a Bluetooth module (BlueSMiRF Silver tested), wired to digital input pins.
• Android Studio and an Arduino IDE.

Usage:

• For Android, set the MAC address of your Bluetooth module in BluetoothActivity.java.
• For Arduino, set the RX and TX pin numbers you wired up.
• Load the Android app, the Arduino sketch, and hit Connect.
• Open the Arduino Serial Monitor, set the baudrate to 19200, and use Newlines.
• Enter a message into the serial monitor, hit enter, and it will show up next to "Read:" in the app.
• Enter a message and hit Write in the app and it will show up in the Serial monitor.

Files to look at:

• BluetoothThread.java
• BluetoothActivity.java
• activity_bluetooth.xml
• bluetooth_demo.ino

Issues:

• Bluetooth socket still fails to connect once in a while (my hardware?)
• Can't seem to get higher than 19200 bps with SoftwareSerial
• Connected/disconnected events in Android should have their own message types
• Handle arbitrary data (delimiter) by implementing escaping (possibly overkill)