Difference between revisions of "HackLab.TO Timing Reference A"

From Hackstrich
(Created page with "This is the main timing reference for HackLab.TO (and tick.hacklab.to). = Project Overview = * Built into an American Data 800-series chassis (3U, 10 modules each with line volt...")
 
(Changing to Dormant for now as I'm not associated with HackLab.TO anymore and have other priorities.)
 
(8 intermediate revisions by the same user not shown)
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= GPS Module =
 
= GPS Module =
* Will take up 2 slots
+
* Will take up 3 slots
 
* Motorola OnCore UT timing receiver
 
* Motorola OnCore UT timing receiver
 
* 7-segment LED displays for:
 
* 7-segment LED displays for:
 
** UTC Time (6 digits, red)
 
** UTC Time (6 digits, red)
** Number of SVs in view (2 digits, green)
+
** Status code (1 digit, red)
 +
** 4x Tracked SV PRN displays (2 digits each, green)
 
* LEDs
 
* LEDs
 
** Power (green)
 
** Power (green)
 
** Comms (white)
 
** Comms (white)
** GPS Fix (blue)
+
** 1 PPS (white)
** Replace Battery (yellow)
+
** OK (blue)
 +
** Wait (yellow)
 
** Fault (red)
 
** Fault (red)
  
 +
== GPS Module Status ==
 +
* 2014-06-16: Bug in the bit writing function, fixed and now can control displays as expected. Also fixed bugs in self-addressing, so that both display driver chips can now be addressed individually. Board hangs randomly after I2C NAKs, need to figure out why this is happening.
 +
* 2014-06-14: Now get a few random segments lit up (wasn't initializing display properly, intensity defaults to zero and scan limit defaults to one), still trying to figure out why I can't get proper digits displayed.
 +
* 2014-06-13: Assembled DISP board and started bringing it up, no lights yet.
 +
* 2014-05-13: DISP board finished and sent to OSH Park for manufacturing.
 +
* 2014-03-06: Tested w/ new antenna connected right to the GPS module, works fine. Likely a board issue with the pass-through, which we can just not use. Next step is to finish the DISP board.
 +
* 2013-11: Received and assembled, GPS communication works but GPS never locks. Need to troubleshoot this further, could be a setup issue, bad GPS board, or an issue with the RF pass-through.
 +
* 2013-10-14: Main board sent to OSH Park for prototype. Display board will be done later.
 +
* 2013-05-16: Main board checklisted, ready for CAM. Display board schematicized, routed. Needs to have mechanical design done and be checklisted.
 +
* 2013-05-15: Main board completely laid out, just needs checklist run.
 +
* 2013-05-13: Chassis is here now and has no PSU, just line voltage going to the cards. Redesigned the module to have a main board (which has the AC/DC converter and most logic on it) and a display board (which has the LED driver and displays on it, and goes on the front panel). Main board is schematicized and 50% laid out now.
 +
* 2013-Early: Designed the module to go on the back of the front panel.
  
[[Category:Current Projects]]
+
== GPS Module Rev 001 Issues ==
 +
* DISP board centre two bar graphs have LEDs backwards
 +
 
 +
[[Category:Dormant Projects]]

Latest revision as of 14:03, 13 November 2017

This is the main timing reference for HackLab.TO (and tick.hacklab.to).

Project Overview

  • Built into an American Data 800-series chassis (3U, 10 modules each with line voltage on an edge connector + space for a connector to the back panel)
  • Chassis came with 10 AD805 distribution amplifiers (1 BNC in, 1 daisychain out, 6 amplified outputs)
    • Will replace as many as required with other timing-related modules, remaining ones will be used to distribute timing references around

GPS Module

  • Will take up 3 slots
  • Motorola OnCore UT timing receiver
  • 7-segment LED displays for:
    • UTC Time (6 digits, red)
    • Status code (1 digit, red)
    • 4x Tracked SV PRN displays (2 digits each, green)
  • LEDs
    • Power (green)
    • Comms (white)
    • 1 PPS (white)
    • OK (blue)
    • Wait (yellow)
    • Fault (red)

GPS Module Status

  • 2014-06-16: Bug in the bit writing function, fixed and now can control displays as expected. Also fixed bugs in self-addressing, so that both display driver chips can now be addressed individually. Board hangs randomly after I2C NAKs, need to figure out why this is happening.
  • 2014-06-14: Now get a few random segments lit up (wasn't initializing display properly, intensity defaults to zero and scan limit defaults to one), still trying to figure out why I can't get proper digits displayed.
  • 2014-06-13: Assembled DISP board and started bringing it up, no lights yet.
  • 2014-05-13: DISP board finished and sent to OSH Park for manufacturing.
  • 2014-03-06: Tested w/ new antenna connected right to the GPS module, works fine. Likely a board issue with the pass-through, which we can just not use. Next step is to finish the DISP board.
  • 2013-11: Received and assembled, GPS communication works but GPS never locks. Need to troubleshoot this further, could be a setup issue, bad GPS board, or an issue with the RF pass-through.
  • 2013-10-14: Main board sent to OSH Park for prototype. Display board will be done later.
  • 2013-05-16: Main board checklisted, ready for CAM. Display board schematicized, routed. Needs to have mechanical design done and be checklisted.
  • 2013-05-15: Main board completely laid out, just needs checklist run.
  • 2013-05-13: Chassis is here now and has no PSU, just line voltage going to the cards. Redesigned the module to have a main board (which has the AC/DC converter and most logic on it) and a display board (which has the LED driver and displays on it, and goes on the front panel). Main board is schematicized and 50% laid out now.
  • 2013-Early: Designed the module to go on the back of the front panel.

GPS Module Rev 001 Issues

  • DISP board centre two bar graphs have LEDs backwards