Sending Live Sensor Data to iOS with BLE

The iOS app is split into separate Javascript modules for charting, audio, bluetooth, and sensor readings. Some of these might not be useful for your specific needs, but they are a good starting point for hardware interaction over BLE.

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├── README.md
├── arduino_ble
│   └── arduino_ble.ino
├── config.xml
├── hooks
│   └── README.md
├── install.sh
└── www
    ├── css
    │   └── index.css
    ├── index.html
    └── js
        ├── audio.js
        ├── chart.js
        ├── d3.js
        ├── index.js
        └── reading.js

5 directories, 12 files

├── README.md
├── arduino_ble
│   └── arduino_ble.ino
├── config.xml
├── hooks
│   └── README.md
├── install.sh
└── www
    ├── css
    │   └── index.css
    ├── index.html
    └── js
        ├── audio.js
        ├── chart.js
        ├── d3.js
        ├── index.js
        └── reading.js

5 directories, 12 files

If you need to modify any of the files in the www folder, you will need to run cordova build after every change, and re-upload the app to your device with XCode.

The main BLE connection and data parsing portion of the code can be found in www/js/index.js.

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  proto.processData = function(data) {

    past_low = this.low_battery;

    data = data.split(',');

    this.yaw.update(data[0]);
    this.roll.update(parseFloat(data[2]) + 180);
    this.low_battery = parseInt(data[3]) < 3300 ? true : false;

    if(this.low_battery && !past_low)
      navigator.notification.alert('The Bluefruit\'s battery is low', null, 'Warning');

    this.update();

  };

  proto.processData = function(data) {

    past_low = this.low_battery;

    data = data.split(',');

    this.yaw.update(data[0]);
    this.roll.update(parseFloat(data[2]) + 180);
    this.low_battery = parseInt(data[3]) < 3300 ? true : false;

    if(this.low_battery && !past_low)
      navigator.notification.alert('The Bluefruit\'s battery is low', null, 'Warning');

    this.update();

  };

You can see that the data parsed out here is sent in the CSV format from the main loop in the arduino_ble.ino sketch.

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  ble.print("AT+BLEUARTTX=");
  ble.print(event.orientation.x, 1);
  ble.print(",");
  ble.print(event.orientation.y, 1);
  ble.print(",");
  ble.print(event.orientation.z, 1);
  ble.print(",");
  ble.print(battery, DEC);
  ble.println("|");

  ble.print("AT+BLEUARTTX=");
  ble.print(event.orientation.x, 1);
  ble.print(",");
  ble.print(event.orientation.y, 1);
  ble.print(",");
  ble.print(event.orientation.z, 1);
  ble.print(",");
  ble.print(battery, DEC);
  ble.println("|");

You can modify this portion of the sketch to send data from any sensor to iOS.