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GPS-VTI

GPS-VTI. by Tony Barry presented by Dave Gault. Overview. minimal wiring (less than thirty wires to solder) no chips, transistors, or surface mount to solder. Just wires + LEDs + switch. doesn't need USB to function, can run off 12V DC based on Arduino AVR architecture (MEGA1280).

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GPS-VTI

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  1. GPS-VTI by Tony Barry presented by Dave Gault

  2. Overview • minimal wiring (less than thirty wires to solder) • no chips, transistors, or surface mount to solder. Just wires + LEDs + switch. • doesn't need USB to function, can run off 12V DC • based on Arduino AVR architecture (MEGA1280). • uses Sparkfun breakout board for MAX7456 • GPS is EM406A from USGlobalSat • Add - two LEDs, one switch, two RCA sockets, a case and an afternoon to assemble • code is open source released under “Berkeley 3-clause software licence”

  3. The circuit diagram

  4. The setup screen

  5. The timing screen HHMMSS milliseconds Vsync period field counter field end

  6. Summary • Cost ~$100 and an afternoon with a soldering iron • Software to load the program into the microcontroller is free • Code is still in development, currently at beta v16 • Independent QA review is yet to be arranged • Should have a second device ready for testing in the new year usage is relatively simple. • Connect to camera, monitor, 12V or USB port of laptop - power on • Switch to "Setup“ • Wait for GPS fix (may take a few minutes) • record observer’s site details • Switch to "Run" • Wait for 10 seconds for the GPS’s ZDA mode to start • Record the occultation.

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