DemoSat V:

The MousetrapThe Mousetrap

August 03, 2007August 03, 2007

Matt Hoffman –Team captain, LandSAT construction

Devlin Thyne – FieldSAT/GPS SAT construction, testing

David Fifield – FieldSAT captain, all programming and code

Evan Spitler – Aid in LandSAT construction, FieldSAT testing

Jason Igo – Support and testing

Matt Hanley- Support and advising

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Mission Statement & Goals:Mission Statement & Goals:

To compete the LandSAT, FieldSAT, and GPSSAT missions in a creative and efficient manner and to create an intuitive post-flight visualization

LandSATTo land, deploy upright and photograph its location

FieldSATTo record orientation data during flight

GPSSATTo record 4-D positional data during flight

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Benefits to NASA:Benefits to NASA:

LandSATProvides a reliable, low cost upright delivery method for research vehiclesProvides a stable platform for instrumentation

FieldSATProvides an accurate log of craft orientation data

GPSSATProvides a log of global positioning data

Integrated Field and GPS data:Allows correlation of short-term inertial data and long-term position data

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Initial Design:Initial Design:

GeometryTetrahedron consisting of four triangular panels Self-corrects position upon opening

Construction Foam core composite with carbon fiber tube reinforcement.

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Payload size was increased by 50%

External framework of pre-cast tube was discarded

Carbon fiber reinforcement formed in place during panel construction

Pneumatic actuators were usedHigh power-to-weight ratioLow cost

Final Design:Final Design:

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Electronic package incorporates all components on one board

Controls the camera

Actuates the pneumatic deployment

Records GPS location data

Records 3-axis acceleration data

Records 3-axis angular velocity data

Final Design:Final Design:

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The AVR microcontroller firmware is written in C using AVR-Libc

actuator control sensor readings records measurements designed for small embedded systems

(8 MHz, less than 2 KB RAM)

The on-ground analysis programs (3D visualization and others) arewritten in Python with an emphasis on rapid development and portability

All source code is freely available

Final Design:Final Design:

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Expected Results:Expected Results:

The GPS unit receives latitude\longitude\altitude\time data This data can later be imported into map\satellite software that shows the exact position with respect to the Earth

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Expected Results:Expected Results:

Acceleration and angular velocity data is logged

This data is later incorporated into a computer simulation demonstrating

the object’s orientation at any given time during the mission

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Expected Results:Expected Results:

Upon landing the unit will unlatch and open

The geometry of the payload allows it to open right side up regardless of initial landing orientation

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Expected Results:Expected Results:

After opening, the package will take pictures of the landing site

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Level of Readiness:Level of Readiness:

Finished package was thoroughly abuse tested along with lengthy hardware functionality tests and multiple full cycle operation tests

We are ready to launch

DemoSat V:

Questions?Questions?

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Construction:Construction:1. High density foam core.

2. Foam is cut to shape, air tank is installed.

3. Core is wrapped in epoxy glass. 4. Panel is vacuum bagged.

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5. Finished panel is drilled to accept hinges.

6. Hinges are coated with Teflon tape to control epoxy adhesion.

7. Hinges are installed.

8. Panels are connected with hinges.