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Daktronics Touchpad Testing Device

Daktronics Touchpad Testing Device. SD0801 Sarthak Ahuja Michael Benson Kalana Maldeniya. Introduction. Client: Daktronics inc. Client Representative: Kurt Kaski Faculty Advisor: Dr. Chao You. Introduction.

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Daktronics Touchpad Testing Device

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  1. Daktronics Touchpad Testing Device SD0801 Sarthak Ahuja Michael Benson Kalana Maldeniya

  2. Introduction • Client: Daktronics inc. • Client Representative: Kurt Kaski • Faculty Advisor: Dr. Chao You

  3. Introduction • Daktronics’ swimming timing system uses a touchpad to indicate when the swimmer has finished each lap. • Our objective is to develop a handheld, battery powered tester for verifying the operation of the touchpad.

  4. Hardware Requirements • In its simplest form the tester will give a visual (LED) and audible (buzzer) indication of when the touchpad is closed. • A connection to a submersible pressure measurement device for measuring actuation force. • An LCD for displaying the measured force. • A female DB9 serial port for connection to a computer for the purpose of updating firmware, etc. • The battery power supply should be a switcher for maximum battery life. • Decoupling caps on the ICs

  5. Software Requirements • The tester will display the force measurement, as well as a latched value indicating the actuation force. • Turn off the LCD and sleep the micro until an input is detected from the touchpad input.

  6. SENSING CIRCUIT

  7. VISUAL AND AUDIBLE INDICATION When a touch is sensed:  White LED for visual indication  A 4 KHz piezo buzzer driven by Pulse width Modulation through the microcontroller

  8. LOAD CELL • Used in measurements involving displacement of a stressed, linearly elastic member • Used a compact button style load cell to measure applied force • Applied force is then calculated and displayed on the LCD screen • Displayed reading is accurate to +/- .25 lbs. and is logged about 20 microseconds after the touch is sensed .

  9. Submersible Force Probe • Uses the load cell to measure the amount of force necessary to actuate the touchpad

  10. Final circuit:

  11. Software

  12. SLEEPING MODE • A sleep timer is initialized to 0 whenever a touch is sensed • If is incremented by 1 in every cycle if no touch is sensed • When it reaches 1500 (10 seconds), the LCD is turned off, and the PIC enters sleep mode

  13. Power Supply 9V battery 5V output Voltage Regulator 5V LCD PIC Max 232 (Transceiver) Sensing Circuit 250mv Touchpad Power Supply

  14. Block diagram of the entire system

  15. Final Product

  16. Setbacks • Method of testing • Decoupling Caps • Sleeping Mode • Creating the submersible probe • Troubleshooting 1. DC/DC conv. 2. Noise

  17. Lessons Learned • Time Management • More Research • Priorities • Parts Ordering • Debugging

  18. Timeline

  19. Budget

  20. Future Work • Further testing to improve reliability • Develop a permanent enclosure for the submersible probe • Add the ability to test other components of the timing system

  21. Summary • Designed a handheld tester that meets the client’s design requirements • Learned that design is only a small part of the development timeline, while debugging is much more time consuming

  22. Acknowledgements • Daktronics inc. • ECE Department • Dr. Chao You • Dr. Mark Schroeder • West Fargo Flyers Swim Team • West Fargo High School • Bart Kent

  23. Questions?

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