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S hutter T iming and F lash S ynchronization S ystem

S hutter T iming and F lash S ynchronization S ystem. Joel Hoffa Shaun Pontsler November 10, 2005 Advisor: Professor Herr. Film Camera Background. Use light to expose film Amount of light controlled by aperture and shutter time (fstops) Shutter timing for different pictures

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S hutter T iming and F lash S ynchronization S ystem

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  1. Shutter Timing and Flash Synchronization System Joel Hoffa Shaun Pontsler November 10, 2005 Advisor: Professor Herr

  2. Film Camera Background • Use light to expose film • Amount of light controlled by aperture and shutter time (fstops) • Shutter timing for different pictures • Fast shutter captures moving objects • Slow shutter captures dim, stationary objects • Different flashes • Flash bulb, takes time to heat up • Xenon flash tube, almost instant

  3. Justification • Sixteen thousand cameras on Ebay • Most listed as “good condition” with no way to actually test the condition • Providing a accurate testing system will save time and money • Knowing the camera’s true condition will allow better pictures

  4. Problem Statement • Design and assemble a portable shutter and flash timing system • Device will measure the time a camera shutter is open and relate the flash synchronization to the shutter opening • The timing will be accurate and precise within the range of 1 millisecond to 100 seconds and having an error of less than 1% • Testing setup needs to be portable and versatile, able to be used "on the go", and to be able to test a wide range of cameras from all eras

  5. Constraints • Economic • Budget ~$300 • Environmental • Must be resilient (portable) • Sustainability • Easy to maintain/replace broken parts • Social • Produce reliable, accurate results knowing that they will affect pricing

  6. Specifications • The shutter timer and flash synchronization system is measured according to two specifications • Repeatability • Accuracy of Results

  7. Hardware Block Diagram

  8. Component Description • Microcontroller • Timing, control, calculations • LCD • Display results • Light source • Shine through shutter • Light sensor • Detect shutter opening and flash • Enclosure • Protect from elements, simple package

  9. Microcontroller Decision Table 1a: Microcontroller Decision Matrix Values Scale: 0 – Unacceptable, 1 – Acceptable, 2 – Preferable Table 1b: Microcontroller Decision Matrix Encoded Values

  10. LCD Decision Table 2a: Display Decision Matrix Values Scale: 0 – Unacceptable, 1 – Acceptable, 2 – Preferable Table 2b: Display Decision Matrix Encoded Values

  11. Budget/Purchasing • The customer will pay for all hardware used to build prototype. Initial estimates show the prototype will cost around $300 • Microcontroller - $100.00 • Serial LCD Display - $55.00 • Photo-Sensor - $20.00 • Light Source - $20.00 • Enclosure - $20.00 • Power Supply - $30.00 • Miscellaneous - $30.00

  12. Design Deliverables Purchasing ● Power Source 11/30/04 – 12/17/04 ● Light Source 11/30/04 – 12/17/04 ● Photo-Sensor 11/30/04 – 12/17/04 ● Microcontroller 11/30/04 – 12/17/04 ● Serial LCD Display 11/30/04 – 12/17/04 Coding ● Microcontroller time measurement 01/03/05 – 01/10/05 ● Serial LCD display 01/11/05 – 01/17/05 ● Serial connection to computer 01/17/05 – 02/07/05 General ● Improving the overall design 01/18/05 – 04/11/05 ● Building the enclosure 01/17/05 – 01/21/05 ● Testing 01/03/05 – 04/11/05

  13. Prepare for shutter measuring Turn on system Measure Shutter Opening Record Results Take back off of camera Push shutter release button Repeat Take film out of camera Position LED and photo-sensor Test photo-sensor Operational Block Diagram

  14. Software Block Diagram

  15. Preliminary Test Plan • Experiment with many different sizes of cameras to optimize support structure configuration • Test shutter times using the oscilloscope and compare times with the STFSS Rough Testing Procedure • Use oscilloscope to determine shutter speed • Repeat as necessary to be accurate • Use processor to determine speed and compare to values found on oscilloscope

  16. Conclusion • Code has already been developed that uses the chosen microcontroller to time switch intervals with high accuracy • After the initial prototype is complete, other features will be added to benefit the user to make the final design feel like a well thought-out, ready-for-production product

  17. Thank You for Listening • Any Questions?

  18. References • AHANIX X156 DISPLAY. <http://www.ncix.com/products/index.php?sku=11450&vpn=X156&manufacture=Ahanix> (Nov 2, 2004.) • BPI-216 Serial Display. <http://www2.onu.edu/%7Esvemuru/eccs362/bpi_bpk.pdf> (Nov 2, 2004.) • BPI-216L Price List. <http://www.seetron.com/prices.htm> (Nov 2, 2004.) • Crystalfontz 632 Series. <http://www.crystalfontz.com/cgi-bin/pricing.pl?product=632> (Nov 2, 2004.) • M68HC12 Microcontrollers. <http://www2.onu.edu/%7Esvemuru/eccs362/M68HC12B.pdf> (Nov 2, 2004.) • Texas Instruments MSP430C337. <http://focus.ti.com/docs/prod/folders/print/msp430c337.html> (Nov 2, 2004.)

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