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Humble Hubble

Humble Hubble. Team 18 : Evan Foote, Doug Wile, Tim Brown, Derek Pesyna. Background: http://apod.nasa.gov/apod/image/1302/ngc1763_lake_1600.jpg. Abstract.

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Humble Hubble

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  1. Humble Hubble Team 18: Evan Foote, Doug Wile, Tim Brown, Derek Pesyna Background: http://apod.nasa.gov/apod/image/1302/ngc1763_lake_1600.jpg

  2. 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

  3. PSSCs An ability to establish a coordinate system based on the telescope's absolute global position via a GPS chipset, and relative orientation based on an accelerometer and electronic compass. An ability to compensate for combined variations in the Earth's gravitational and magnetic field, and variations in telescope geometry and mounting configurations via electronic user calibration. Background: http://apod.nasa.gov/apod/image/1302/ngc1763_lake_1600.jpg

  4. PSSCs An ability to retrieve celestial coordinates and targets via Bluetooth from an external host. An ability to automatically move and point the telescope at the designated target using feedback loops from integrated motor encoders. An ability to allow the user to manually override the telescope's target coordinate using an onboard electronic control interface, and to display information regarding headings on an onboard LCD. Background: http://apod.nasa.gov/apod/image/1302/ngc1763_lake_1600.jpg

  5. Block Diagram

  6. Component Selection Rationale • All on-board sensors are surface mount and 3-axis. • GPS switched to on-board antenna, but not Bluetooth • CPU selection rationale:

  7. Packaging Design

  8. Packaging Design

  9. Schematic: Main Board

  10. Schematic: Aux Board

  11. Focus on Motor Control PWM Signal Brake / Coast Enable (High Z)

  12. Focus on 3.3V regulator ON / OFF interrupt Hold Circuit on DPDT Latching Switch

  13. Need to add headers Schematic: Sensor Breakout Board

  14. PCB Layout Main Board Rotary encoders Auxiliary boardheaders Sensor boardheaders RS232 line driver/receiver PIC micro LCD header,shift register VEX encoders

  15. PCB Layout Auxiliary Board 5V, 3.3V, GND Bluetooth + GPSheaders Bluetooth module, 50 ohm antenna 5V, 3.3V voltageconverters GPS receiver H-bridge + power headers H-bridges,associated logic

  16. PCB Layout Sensor Board Gyroscope Accelerometer Compass I2C + powerheaders

  17. Errata • VDD/VSS for I2C and VEX on main board • Replace temporary headers with real headers • Change 100uF capacitor from SMD to through-hole on aux board • Unconnected pins on microcontroller, sensors • Make rotary encoder pads/hole larger

  18. Software Design (Initialization) Start Init. Move to point North Select calb. target Turn on Bluetooth, Connect Telescope points to calb. target Turn on GPS. Get reading Send GPS/time data to Android Accel, compass reading User centers telescope on target Android calcs calibration targets Move to level position Init. Done

  19. Software Design (Main Loop) Start Main Get target from Android Move to target Wait for new target

  20. Project Completion Timeline

  21. Questions?

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