This command sets the Notecard's ProductUID and serial number. Make sure to replace "com.your-company:your-product-name" with your ProductUID from Notehub Setup. Also, replace "a-serial-number" with a relevant identifier for the object that the Notecard will be attached to (e.g. "mile marker 100", if this were a real world scenario).
This command configures the Notecard's accelerometer's sensitivity (an integer, ranging from -1 to 5). The lower the sensitivity value, the less sensitive the accelerometer will be. We only want to detect drastic movements due to a collision, so we are setting the value low. Setting sensitivity to -1 is probably a better choice for the real-world application, but a sensitivity of 1 is better for local testing.
This command configures the Notecard to send a note to Notehub every time it detects motion. The "start": true parameter tells the Notecard to begin motion tracking.
With those commands entered, unplug the Notecarrier's USB connection so that the Notecard's running on LiPo power. With the Notecarrier resting face up on your work surface, quickly push the Notecarrier several inches to simulate a collision. Go to your project on Notehub, open the Events tab, and soon enough you should see an event like this in _motion.qo for the push:
Tip: If you don't see the Notecard's green LED blinking shortly after pushing the Notecarrier, you likely didn't accelerate fast enough to exceed the sensitivity threshold we set earlier. Try accelerating faster.
Let's break down the fields in the response:
alert: This will always be true when we get a _motion.qo note after issuing card.motion.sync.
motion: The number of motion detections since the last note.
movements: A string of base-36 characters, where each character represents the number of movements in each bucket during the sample duration. Each character will be a digit 0-9, A-Z to indicate a count of 10-35, or * to indicate a count greater than 35.
orientation: The orientation of the Notecard in space.
temperature: Temperature reading from the Notecard.
tilt: The number of orientation changes since the last motion note.