Ah, the fresh beginning. New, dewy frog fodder for the road. Shining bright entrails spatter so Zen-like on the oily blacktop. Bravo, Toad...well done!
I recently bought a "Digital Protractor", as I was curious about how it works. On Amazon, the price was about 16 USD.
So here is a visual teardown, in 4 easy photos. :-)
I was hoping there would be a hidden data port, similar to what is found on Digital Calipers, but no such luck. The basic mechanism its similar: as circular track instead of a linear track.
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| TrackR to SWD Adapter Connection Overview |
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| The TrackR Locator Fob |
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| Major Parts of the TrackR |
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| Close-Up of TrackR Internals |
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| Annotated TrackR PCB Board (Front Side) |
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| Annotated TrackR PCB Board (Back Side with Pogo Pin Pads) |
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| TrackR Aluminum Shell Case (Note Non-Anodized Area for Antenna Contact) |
private static final String DFU_PACKAGE = "no.nordicsemi.android.nrftoolbox/no.nordicsemi.android.nrftoolbox.dfu.DfuActivity";
private void triggerDFU() {
Thread thread = new Thread() {
@Override
public void run() {
try {
Log.d(TAG, String.format("enable Indicates for ServiceChanged"));
mBleWrapper.setIndicationForCharacteristic(mServiceChangedCharacteristic, true);
sleep(1000);
Log.d(TAG, String.format("enable Notifys for DfuControlPoint"));
mBleWrapper.setNotificationForCharacteristic(mDfuControlPointCharacteristic, true);
sleep(1000);
Log.d(TAG, String.format("write DFU-Start to DfuControlPoint"));
byte[] dfuStart_bytes = new byte[12];
dfuStart_bytes[0] = 0x01; // Start DFU
dfuStart_bytes[1] = 0x04; // Application
mBleWrapper.writeDataToCharacteristic(mDfuControlPointCharacteristic, dfuStart_bytes);
dfuDelayHandler.postDelayed(new Runnable() {
@Override
public void run() {
try {
Intent intent = new Intent(Intent.ACTION_MAIN);
intent.setComponent(ComponentName.unflattenFromString(DFU_PACKAGE));
intent.addCategory(Intent.CATEGORY_LAUNCHER);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
PeripheralActivity.this.startActivity(intent);
} catch (Exception e)
Toast.makeText(PeripheralActivity.this,
"The \"nRF Toolbox\" app was not found. Please install it.",
Toast.LENGTH_LONG).show();
}
finish();
}
}, DFU_DELAY);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
};
thread.start();
}
This photo was taken when I was working on the touchscreen for Rumble-Touch. I wrote the Linux touchscreen input driver which controls the Analog Devices AD7147 capacitive-senor device.
When all these splayed-out parts are stuffed in the case, the LCD panel folds under the touchscreen glass and the battery is next to the main PCB. It all fits together into quite a small package.
