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bitty_data_logger_device_code

Example microcontroller code and templates for use with Bitty Data Logger.

Capture Modes

Note that Bitty Data Logger supports two data capture mode.

In Auto mode, data is sampled and communicated over Bluetooth automatically by the microbit software framework known as the DAL. You need to write very little microbit code if you take this approach.

In User Code mode, you are responsible for acquiring data from within your own code and for sending it over Bluetooth in the correct format to a connected device using the Bluetooth UART service. Message formats for the different types of data which Bitty Data Logger supports are defined below.

UART Message Formats

General:

    message.setNumber(NumberFormat.Int8LE, 0, message_type);
    message.setNumber(NumberFormat.Int32BE, 1, timestamp);
    message.setNumber(NumberFormat.Int16BE, 5, value1);
    message.setNumber(NumberFormat.Int16BE, 7, value2);
    message.setNumber(NumberFormat.Int16BE, 9, value3);

Message Types:

    1,2,3,4 : general data items 1, 2, 3 and 4 : value1 = an arbitrary 16-bit value in BE format (only the value1 field is used with these message types)

    10    : accelerometer: value1 = X, value2 = Y, value3 = Z

    11    : magnetometer: value1 = X, value2 = Y, value3 = Z

    12    : compass: value1 = compass bearing

    13    : temperature: value1 = temperature