Launch Readiness Review4/21/06

-David Gooding -Erik Andersen -Anna Vigil -Matt Elsner

-Augustine Trujillo

DemoSat IV

Mission Description

Successfully launch and land a payload that deploys a rover capable of taking pictures while traveling around the landing site autonomously.

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Mission Goals and NASA Benefits

1) Box land on one of three designated sides.

2) Be the first team to have box open and rover travel out of box independently.

3) Rover maneuver around objects correctly.

4) Rover travel around for at least 10min taking at least 15 pictures.

1) Encourage learning and team building for students.2) A simplistic design is utilized to perform a complicated

experiment.3) Design techniques allow the payload to land and

traverse in nearly all terrains.

System Requirements

Weight Specification - 1800g Sense landing autonomously - micro switches Carrier must open autonomously and upright

- rat traps Rover must drive out of carrier autonomously

- program Rover must take pictures of landing site -

program

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PIC Running During Flight

Initialize Pins

10 Min Elapsed?

Send Signal to Emitter

Signal to motor to open box

Turn Camera On

Run motor program: Forward

Object Sensed?

Send Signal to Motors to

Stop

Take Picture

Turn

No:reset

Yes

Yes

No

Detect Emitter

Switches Pressed

Carrier Rover

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Subsystem DescriptionCarrier

Micro switches PIC 16F819 Emitter Transistor switch Box switches Micro motor Batteries

Rover Oopic/

microcontroller board Two gear boxed

motors Motor driver IR Sensor Camera IR Detector Batteries

Subsystem Description: Carrier

Micro switches – Sense landing. Must be pressed for a continuous 5 minutes.

PIC – Once 5 min has elapsed a signal is sent to turn on emitter.

Emitter – Emit IR signal to detector on Rover to turn it on.

Transistor switch – The base is being saturated allowing voltage to flow through it to the motor.

Box switches – Manual opening and closing. Micro motor – Opening/closing mechanism for

carrier. Batteries – 1-9v for PIC, 2-AA for motor.

Schematic of Subsystem: Carrier

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Emitter

LINE VREG

COMMON

VOLTAGE 9v

Micro Sw itches

MotorM

Manual Sw itch

+

_

3V

_

+

+

_

TransistorSwitch

Subsystem Description: Rover

IR Detector – Sense emitter to turn Rover on. OOPic/ microcontroller board – Object oriented

with built in functionality to perform extensive electronic commands.

Gear boxed motors – 6 gear box motor. Motor driver – Takes a PWM signal and converts it

into speed and direction of 2 independent motors. IR sensor – Sense objects: avoid obstacle / picture. Camera – Take pictures of landing site. Batteries – 1-9v for OOPic, 4-AA for motor drivers.

OO

Pic

MD22Motordriver

Camera Relay Circuit

IR Detector

IR Scanner (Sharp GP2D12)

FlatFoto Digital Camera

3MP

Tamiya 6-Gearbox

Tamiya 6-Gearbox

Block Diagram of Subsystem: Rover

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Item Cost

Digital Camera Free

IR Sensor $12.95

Twin motor gear box $16.50

Emitter + Detector $5.00

Foam Board $25.00

Lithium Batteries $35.00

Micro switches $19.00

OOPic $84.00

PIC 16F819 $3.59

Dual motor driver $102.00

Total $303.04

Expenses

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Mass Budget

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Carrier Rover

Rod 28.4g OOPic 42.9g

Foam padding 30.0g Motor controller 73.3g

Brackets 32.1g Camera 78.4g

Hinges 42.8g Frame 80.0g

HOBO 50.0g Motors 129.3g

Micro switches 62.4g Wheels 162.2g

Micro motor 62.8g Batteries 165.6g

Batteries 100.9g

Press pad 136.7g

Rat traps 141.2g

Cushion foam 210.8g

Misc 136g

Total 1034.1g Total 731.7g

Total: 1765.8g

Testing

• Carrier opening Micro motor with latch

• Rover traction Wheels with tracks and spikes

• Drag test Trash bag stayed in tact

• Drop test Rover stayed in place

• Cold test In Freezer for 1 ½ hours. No

Voltage loss.

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Full Function Test

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Project Organization

David – Rover circuitry and programming Erik – Mechanical design and implementation Anna – Carrier electronics and programming Matt – Carrier electronics + rover mechanics Augustine – Carrier opening design and

implementation.

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