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Critical Design Review and Report
- 1. CRITICAL DESIGN REVIEW - SensorBall Sponsors: Anthony Vaughan, Evan Sawyer, Matt Poole, Peggy Liska Members: Maryam Abdul-Wahid, Tamara Alani, Angel Lopez, Brian Ngo, Ryan Stelzer December 3, 2015
- 2. AGENDA • Introduction - Overview of the project and requirements • Changes since PDR • Overview of Design - System Block Diagram • Subsystem Designs and Analysis – Structure – Electronics – Software • Test procedures • Risk Analysis • EVMS Summary • Cost Analysis/BoM • Summary and Next Steps
- 3. INTRODUCTION •Showcase TI products at a tradeshow •Highlight 4 product lines –SAR ADC –Delta-Sigma ADC –DAC –Operational Amplifiers •Sensors –Accelerometer –Temperature –Light –Heart Rate
- 4. CHANGES SINCE PDR Non-Functional Requirement The ball shall have 20 RGB LEDs, each string emitting at least 3 lumens, driven by TI DACs and Amplifiers. Verification Method Verify by inspection of datasheet
- 6. SUBSYSTEM DESIGN & ANALYSIS
- 10. STRUCTURE - BALL • PETG plastic hemispheres, 12” D – Purchase sphere • HDPE plastic ring, ¼“ thick, ~.5 lb – Custom order
- 12. STRUCTURE - NUCLEUS • Acrylic, 3” x 3.5” x 3.5”, ~1 lb • Insets for carbon fiber legs • 10-32 ¾” screws • AME Machine shop
- 17. STRUCTURE - LOCATION OF ELECTRONICS • Battery attached underneath nucleus • Temperature and heart rate sensors at end of legs • LED strips on face of legs • LED/sensor wiring runs through legs
- 19. ELECTRONICS Tamara Alani & Maryam Abdul-Wahid
- 22. MCU SCHEMATIC 1
- 37. ELECTRONIC STACK - BOTTOM Power MCU BLE HM-11
- 38. ELECTRONIC STACK - TOP Accelerometer placed here Light Sensor Op Amp for Heart Rate ADC for Temperature Sensor Vibration motor placed here
- 39. EXTERNAL PCBs Heart Rate Monitor PCB Temperature Sensor PCB RTD Placed Here
- 41. SYSTEM BLOCK DIAGRAM - MCU ● BLE’s Baud Rate is 9600. ● Sensor Reading is limited by BLE transfer speed. ● Read one sensor ata time with SPI
- 43. GRAPHICAL USER INTERFACE - LabView
- 45. BOUNCE N’ BEAT ACCELEROMETER & HEART RATE MONITOR 1.Measure user’s resting heart rate (in BPM) 2.Add 20 BPM to resting heart rate for target heart rate 3.Challenge user to reach target heart rate (or higher) by only moving in the X-direction (Y- and Z- direction will have thresholds) • Visual feedback: – YELLOW: game is in progress, no violations – RED: user has crossed the Y- and Z- thresholds (activate vibration motor) – GREEN: user WINS!
- 46. ACCELEROMETER & HR DEMO • Top shows Target Heart Rate • Graph shows Z-axis acceleration data • The two sliders show whether a person is under the desired threshold X Z
- 47. CAN I GET A WATT WATT? LIGHT SENSOR • LED brightness varies inversely with the irradiance measurement • When light irradiance is high, LEDs will be DIMMED • When light irradiance is low, LEDs will be BRIGHTENED
- 48. LIGHT DEMO • Text box will display irradiance. • User may select what color the LEDs on the ball will display through the GUI using the dial.
- 49. SENSORBALL SENSES TEMPERATURE SENSOR • Measure user’s body temperature • Display ‘fortune’ on GUI You’re sad, go eat a waffle Error 404: Fortune not found 39 days, 18 hours, 2 minutes, and 14 seconds... You will adopt 13 cats tomorrow You’re HOT
- 50. TEMPERATURE DEMO • Mood text box will display user’s mood based on user’s temperature • Temperature textbox will display user’s body temperature • LED color will correspond to mood
- 52. TESTS • The ball must be able to withstand a 6 foot drop - STRUCTURAL INTEGRITY • The ball must weigh less than 10lbs* • Two games/demos* • Operating battery life of 8 hours* • The ball must contain multicolored lights* • System must restore full power within 12 hours - RESTORATION • PC and system must communicate bi-directionally* • The GUI will receive sensor data within 2 seconds* • Temperature of the ball (outer structure) must not exceed 100°C while in use* • GUI must be compatible with Windows 7 and 10 - COMPATIBILITY (*) - Trivial Tests
- 53. TEST: The ball must be able to withstand a 6 foot drop (preferred). TEST PROCEDURE: 1. Perform the following test on concrete and carpet flooring. 2. Use a measuring tool (ruler, measuring tape, or a pre-measured marker) to measure 6ft. +/- .5ft. from the ground upwards. Record. 3. Drop the ball from the measured height using hands or table top. 4. Inspect the ball for any damages. Record data. 5. Test that the system functions properly. 6. Repeat Steps 3-5 two more times. STRUCTURAL INTEGRITY - TEST PROCEDURE
- 54. STRUCTURAL INTEGRITY - DATASHEET ❏ Pass Measured height ______ feet. Record data in table below: Rate the damages as one of four options: none, minor, moderate or severe. State if the system is functional: yes - functioning, no - not functioning. Make a note of each test. Test 1 Test 2 Test 3 Concrete Carpet Concrete Carpet Concrete Carpet Damages Functional Notes ❏ Fail, why ________________________________
- 55. RESTORATION - TEST PROCEDURE TEST: The ball must restore full power within 12 hours TEST PROCEDURE: 1.Disassemble ball 2.Charge battery pack to full power 3.Record time to charge 4.Reassemble ball 5.Power ball 6.Display data from all 4 sensors on GUI 7.Record this data onto datasheet
- 56. RESTORATION - DATASHEET ❏ Pass Check off whether each sensor displays data after restoration: Pass Fail Accelerometer Temperature Light Sensor Heart Rate Time to restore power: __________ Hrs ❏ Fail, why ________________________________ ❏ ❏ ❏ ❏ ❏ ❏
- 57. COMPATIBILITY - TEST PROCEDURE TEST: GUI must be compatible with Windows 7 and 10 TEST PROCEDURE: 1.Power ball and PC 2.Load GUI on Windows 7 3.Switch game modes using the GUI 4.Record result on datasheet 5.Change LED color using the GUI 6.Record result on datasheet 7.Repeat steps 1 - 6 on Windows 10
- 58. COMPATIBILITY - DATASHEET ❏ Pass ❏ Fail, why ________________________________ Can the GUI switch between games and demos? Yes/No Does the GUI allow you to change the color of the LEDs in the ball? Yes/No Can the GUI switch between games and demos? Yes/No Does the GUI allow you to change the color of the LEDs in the ball? Yes/No WINDOWS 7 WINDOWS 10
- 60. RISK MATRIX 1. Unable to schedule meetings 2. Power supply 3. Structure design 4. Labor resource 5. Receiving materials and electronics 6. Software bugs 60 Likelihood Consequences Insignificant (easily handled) Minor (some disruption) Moderate (significant time/resources required) Major (project severely damaged) Catastrophic (project down the tubes) Almost certain (>90%) High High Extreme Extreme Extreme Likely (50%- 90%) Moderate 6 High High Extreme Extreme Moderate (10%-50%) Low Moderate 2 High 3 Extreme Extreme Unlikely (3%- 10%) Low Low Moderate 5 High 4 Extreme Rare (<3%) Low Low Moderate 1 High High
- 61. BOM
- 62. DRAWING STATUS DRAWING STATUS STRUCTURE ● (1) NUCLEUS SIDE - SHORT ● (2) NUCLEUS SIDE - LONG ● (3) NUCLEUS BOTTOM ● (4) NUCLEUS SUB-ASSEMBLY ● (5) LEG MODIFICATION ● (6) SPHERE SUB-ASSEMBLY ● (7) ASSEMBLY DONE SCHEMATICS ● MCU ● TEMPERATURE SENSOR ● LIGHT SENSOR ● ACCELEROMETER ● HEART RATE MONITOR ● BLE ● LED & DRIVER ● POWER ● VIBRATION MOTOR DONE PCB ● ELECTRONIC STACK - BOTTOM ● ELECTRONIC STACK - TOP ● HEART RATE ● TEMPERATURE DONE
- 63. EVMS PROJECT PLAN SUMMARY
- 64. SUMMARY & NEXT STEPS • Nucleus structure in plastic ball • Temperature, accelerometer, light, and heart rate sensors • LabView GUI Next Steps • Place remaining orders • Start building and testing
- 65. QUESTIONS?
- 66. APPENDIX
- 67. CENTER OF MASS ANALYSIS
- 68. MATERIAL FAILURE ANALYSIS Lowest FoS for different failure modes
- 69. BLUETOOTH ATTENUATION ANALYSIS • Calculate the path loss due to free space and the PETG plastic. Compare the loss to the communication link margin between the transmitter and the receiver. Communication will occur if loss is less than the link margin. • BLE HM-10 has four RF options. The larger the value, the better the signal and wider the range.
- 70. UML
- 71. BATTERY LIFETIME