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Embedded GPS receiver for sale. 10Hz update, 66 channels, serial TTL interface — Parallax Forums

Embedded GPS receiver for sale. 10Hz update, 66 channels, serial TTL interface

Timothy D. SwieterTimothy D. Swieter Posts: 1,613
edited 2010-03-29 09:43 in General Discussion
Many, many moons ago I purchased a handful of GPS receivers to sell on Brilldea. Time has gotten away from me though and I never posted the product. I am cleaning out my inventory closet and thought I would post here to see if anyone is interested in purchasing a GPS unit from me (I kept a handful for my own experiments). Attached is the data sheet that I have for the device as well as a couple pictures.

Here are the basics about the device:
  • Made by Locosys, product number LS20031, description GPS smart antenna module with MTK 3329 chipset, TTL serial interface
  • MTK 3329 chip (MediaTek) has 66 channels and is able to output info at 10Hz.
  • Operating voltage is 3.3V DC, 29mA.
  • The unit is roughly 30mm by 30mm by 6.4mm
  • The system is setup for the default 9600 baud, advance configuration will unlock the higher update rates. Review a MTK 3329 data sheet for details.
  • Each sale includes 1x GPS unit, 1x four conductor 15" cable with 0.1"x4 receptacles on each end, and 2x 0.1"x4 headers. (one header needs to be soldered to the GPS by yourself, see the pin information in the data sheet)
  • All equipment is new and unused.
  • Cost is US$50.00 per "kit" plus a flat rate of US$4.00 for first class mail shipping from Singapore.

If you are interested you can drop me a PM here on the forum. Please provide your e-mail address and quantity and I will forward a PayPal Invoice. The item can ship this week. This is a limited time offer to clean my inventory. There are 8 units available for this offer.

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Timothy D. Swieter, E.I.
www.brilldea.com - Prop Blade, LED Painter, RGB LEDs, 3.0" 16:9 LCD Composite video display, eProto for SunSPOT, PropNET, PolkaDOT-51
www.tdswieter.com
pdf
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LS20030~3_datasheet_v1.1.pdf
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Comments

  • Timothy D. SwieterTimothy D. Swieter Posts: 1,613
    edited 2010-03-28 13:37
    5 units spoken for. 3 remain.

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    Timothy D. Swieter, E.I.
    www.brilldea.com - Prop Blade, LED Painter, RGB LEDs, 3.0" 16:9 LCD Composite video display, eProto for SunSPOT, PropNET, PolkaDOT-51
    www.tdswieter.com
  • Roy ElthamRoy Eltham Posts: 3,000
    edited 2010-03-28 17:59
    Can someone explain to me why a GPS reciever unit would need so many channels? I would like to understand the benefit.

    There are currently (as of Dec 2009) only 30 active GPS satallites in orbit, and at best you might be able to "see" 12 of them at any one time. They are planning on launching more satallites, but I still don't see the number visible at any one time getting over 20. Especially since some of the currently active ones are going to be go inactive most likely before they finish launch the planned new ones.

    So is there something I'm missing? Why make a GPS unit that has 50 or 66 channels?

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    Check out the Propeller Wiki·and contribute if you can.
  • Timothy D. SwieterTimothy D. Swieter Posts: 1,613
    edited 2010-03-28 22:50
    Still three units remaining and looking for a good home.


    Roy - That is a good question you ask. I don't have a good answer, but I can theorize for a moment. Beyond the USA's GPS system there are satellites being launched for Europes GPS system called Galileo (I think) and those will add to the mix of satellites. Beyond that I am sure that one would only need to track a handful or be able to track a handful of satellites at a time, but have room for future expansion of the GPS system. THere may be something with startup time and tracking satellites from last known position that occurs faster with more channels. For instance, perhaps it keeps information for satellites when you were treking in the Amazon and then when you return home to The GPS would recognize the pattern in the sky and have some information that allows starting up to occur faster. If that the channels were limited then Perhaps the device wouldn't recall where it was and have to cold start all the time.

    This is just a guess. If someone has a better answer please feel free to post it up.

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    Timothy D. Swieter, E.I.
    www.brilldea.com - Prop Blade, LED Painter, RGB LEDs, 3.0" 16:9 LCD Composite video display, eProto for SunSPOT, PropNET, PolkaDOT-51
    www.tdswieter.com
  • Timothy D. SwieterTimothy D. Swieter Posts: 1,613
    edited 2010-03-29 09:43
    All the GPS units have found good homes. If this is something that is of interest, perhaps in the future I can get more units and support the product. At the moment though it is cleaning inventory time and taking an evaluation of where to focus my efforts.

    Thank you to those who purchase a unit.

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    Timothy D. Swieter, E.I.
    www.brilldea.com - Prop Blade, LED Painter, RGB LEDs, 3.0" 16:9 LCD Composite video display, eProto for SunSPOT, PropNET, PolkaDOT-51
    www.tdswieter.com
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