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.javaBluetoothActivity.javaactivity_bluetooth.xmlbluetooth_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)