Project 13: Automated Telescope Mirror Cover
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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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