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Timothy Sloan John Edgar Charlie Carbiener Rene Sanchez

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Project 13: Automated Telescope Mirror Cover Sponsor: Dr. Guenter Maresch Faculty Adviser: Dr. Kamal Amin. Timothy Sloan John Edgar Charlie Carbiener Rene Sanchez

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Project 13: Automated Telescope Mirror CoverSponsor: Dr. GuenterMareschFaculty Adviser: Dr. Kamal Amin

Timothy Sloan John Edgar Charlie Carbiener Rene Sanchez

Team Leader Webmaster Communication Liaison Financial Advisor

[email protected]   [email protected] [email protected] [email protected]

problem statement
Problem Statement
  • Remote and inconvenient to operate
  • Mirrors compromised by bugs, dust and other environmental factors
  • Current controller has only four outputs for stepper motors
  • Tedious control of each individual function

Rene Sanchez

objectives
Objectives
  • Design and implement mechanical covers for both the primary mirror and the aperture of the telescope
  • Use only the four stepper motor outputs on the controller
  • Integrate the control for all of the telescopes functions into one system
  • Create a graphic user interface for the main control system that is accessible online

Rene Sanchez

mirror and aperture covers
Mirror and Aperture Covers
  • An array of ABS flaps rotate in and out of the closed position using stepper motors
  • The flaps will be paired using a replicator we will make
  • This will allows for all eight flaps to be controlled using just the four outputs on the existing controller

Charles Carbiener

replicator
Replicator
  • Duplicates the signal coming from the controller, allowing motors to be paired
  • External power source used to ensure enough current can be drawn
  • This will allows for all eight flaps to be controlled using just the four outputs on the existing controller
  • High power MOSFET’s used to control the motor with signals from the existing controller
  • Baby Orangutan used to read when flaps are closed and make sure that each flap operates in phase

Charles Carbiener

error checking
Error Checking
  • Flaps need to operate in phase
  • Momentary switches can sense when the flaps are opened and closed
  • Baby Orangutan can use this to sense when flaps are out of phase and control an individual motor to correct the issue
  • Reduction in maintenance

Charles Carbiener

motor selection
Motor Selection
  • Each ABS flap will weigh roughly 0.5 lb or 0.23 kg
  • Highest required torque of 0.166 ftlb(32 oz in or 0.023 kg m)
  • Motor must fit within a 2” by 2” (50 mm by 50mm) square in order to fit on the mount
  • Pololu stepper motor chosen

Charles Carbiener

materials and electronics
Materials and Electronics
  • ABS chosen for both the mount and the flaps
    • Light
    • Easy to cut with laser cutter
  • Baby Orangutan used to allow the replicator to sense if flaps are out of phase and realign
    • The Baby Orangutan is cheap and small
  • High power MOSFET’s to control the motors
  • 12V 15A power supply on sight

Rene Sanchez

future work
Future Work
  • Parts and materials being ordered early this week
    • Ordering through Dr. Maresch and NFCC
  • Rough prototype to be made in the mean time
    • Two paired cardboard flaps
    • Replicator used for pairing
  • Once parts are in, refined prototype to be constructed and implemented onto the telescope

Rene Sanchez

conclusion
Conclusion
  • Eight ABS flaps used to cover the primary mirror and the aperture
    • Flaps all operated in pairs
  • Replicator used to pair flaps together and allow for use of only four outputs
    • High power MOSFET’s used to control the motors
  • Prototyping
    • Rough prototype beginning now
    • Once parts are in and fabricated, refined prototype implemented onto the telescope

Rene Sanchez

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