Launch Readiness Review 4/21/06 -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. DemoSat IV

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 g  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 DemoSat IV

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 No Detect Emitter Switches Pressed CarrierRover DemoSat IV

Subsystem Description Carrier  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 DemoSat IV

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.

OOPic MD22 Motordriver Camera Relay Circuit IR Detector IR Scanner (Sharp GP2D12) FlatFoto Digital Camera 3MP Tamiya 6-Gearbox Tamiya 6-Gearbox Block Diagram of Subsystem: Rover DemoSat IV

ItemCost Digital CameraFree 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$3.59 Dual motor driver$ Total$ Expenses DemoSat IV

Mass Budget DemoSat IV CarrierRover Rod28.4gOOPic42.9g Foam padding30.0gMotor controller73.3g Brackets32.1gCamera78.4g Hinges42.8gFrame80.0g HOBO50.0gMotors129.3g Micro switches62.4gWheels162.2g Micro motor62.8gBatteries165.6g Batteries100.9g Press pad136.7g Rat traps141.2g Cushion foam210.8g Misc136g Total1034.1gTotal731.7g Total: g

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. DemoSat IV

Full Function Test DemoSat IV

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. DemoSat IV