1. Humble Hubble Team 18 – Derek Pesyna Abstract
The proposed project is a self-aiming telescope. This telescope will obtain its global position and the local time via GPS. It will then automatically orient itself to point at a user selected target (star) using a variety of onboard sensors.
Background:

2. Block Diagram

3. Definition of Criticality Levels
λ - the predicted number of failures per 106
hours of operation
High: Injury to user and critical system failure (  10-9 )
Medium: Whole system needs replaced/repaired (  10-6 )
Low: PCB/single component can be easily repaired
(  10-5 )

4. Overall Schematic

5. Sensor Breakout Module

6. FMECA Chart Failure No. Failure Mode Possible Causes Failure Effects
Method of Detection
Criticality
Remarks A1
Motor 100% (full on)
-H-Bridge Failure
-Micro motor output stuck high
Telescope moves unexpectedly & continues moving
Observation
Medium
Worse case: telescope mount breaks B1
Telescope does NOT point north and is NOT level during calibration
-Compass failure
-Accel. Failure
-Gyro Failure
-Encoder Failure
Compass cannot be calibrated and thus will not function
Low
Component replaced on breakout module and/or sensor breakout PCB replaced B2
Telescope does not point to correct celestial body
Compass is not functional (manual control may be necessary) C1
Telescope does not move
-269 Vex Motor Failure
-Power supply not functional
-Micro fried
Compass not functional
Low/