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: http://apod.nasa.gov/apod/image/1302/ngc1763_lake_1600.jpg

Block Diagram

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 )

Overall Schematic

Sensor Breakout Module

FMECA Chart Failure No. Failure Mode Possible Causes Failure Effects Method of Detection Criticality Remarks A1 Motor Output @ 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/