Engineering Requirements

1. The system shall detect movements of the Combiner at within 1 arcminute of accuracy.
2. The magnet’s axis of rotation shall be within 2 inches.
3. The system shall cause a magnetic deflection of no more than 1 degree at any location of 30cm away from the system.
   1. Verification, Testing: Using a magnetometer, check points around the structure at a distance of 30cm, check that the value recorded is less than 1 degree.
4. The magnet and sensor must be installed onto the rotating mechanical structure of the HUD.
   1. Verification, Analysis: Inspect the final structure, make sure that the magnet and sensor are mounted securely to the rotating part of the structure such that when the structure is rotated the magnet and sensor stay in place.
5. The System must not effect Mechanical performance of the HUD.
   1. Verification: After installing the sensor, the rotation of the device won’t be impacted
6. The GUI shall display the angle measurement in degrees and arcminutes.
   1. Verification: We are going read measurement from micro controller and compare
7. A linear apparatus shall be used to verify the sensor’s measurements, 10 micrometers of displacement shall produce about 1 arcminute of displacement in our system.
8. The magnet and the sensor shall be within 5mm apart.
9. User calibrated values shall remain stored in the system in non-volatile memory through power cycling.
   1. Verification, Testing: set a calibrated value into the system memory, power off the device, then repower the device and read the value back, compare the inputted value and the one read in to see if they match.
10. The GUI will report back if the system has moved past the calibrated trip point.
11. The GUI can calibrate the zero point and trip limits of the sensor.
12. 9/10 users can interpret the information from the sensor and calibrate the sensor using the GUI.

Customer Requirements

1. The system shall detect movements of the Combiner at <1 arcminute of accuracy
   1. Note: 60 arcminutes = 1 degree
   2. Standard “MISALIGNED” trip limit is ~10 arcminutes
2. The magnet’s axis of rotation shall be <2 inches
3. The system shall cause a magnetic deflection of <1° at a distance of 30cm
   1. Note: Distance measured from the nearest point to the system’s magnet
4. The entire electrical system shall be designed to fit in a mechanical structure that resembles the Combiner mechanical design
   1. Magnet and sensor will be on facing knuckles – Sensor on rotating knuckle
   2. PCB will be separate from the knuckles, but connected to the sensor somehow
5. The GUI shall output the angle measurement in degrees and arcminutes
6. The electronic measurement shall be validated to accurately represent the physical displacement
   1. Note: Must come up with a way to accurately measure the physical displacement in order to show that the electronic measurement displayed on the GUI correlates accurately
7. The user shall be able to calibrate “zero” position
8. The user shall be able to calibrate the “misaligned” trip limits
9. User calibrated values shall remain stored in the system through power cycling
   1. Must be stored in non-volatile memory
10. The GUI shall display misaligned message if magnet has moved past the calibrated trip point