GPS time standard clock with display

in project logs by DP | 6 comments

Ezflyr’s GPS-based clock uses the GlobalSat EM-406 module to show the time with around 1 second accuracy.

Here is a photo of the completed GPS Display Time Standard I intend to use for setting a variety of clock projects I’ve made, or am working on. This GPS module, the GlobalSat EM-406, has excellent sensitivity as I’ve been able to lock onto the necessary satellites inside my home without any difficulty!

Via the forum.

This entry was posted in project logs and tagged , , .

Comments

  1. Tony says:

    Accuracy from GPS should be a LOT better than 1 second. Is it just because of a display limitation?

  2. Adam Shea says:

    Most modules I’ve seen say the 1pps is accurate to about 10ns which would be 10ppb accuracy.

  3. JBeale says:

    I think only the dedicated timing modules reach 10 ns (and only in good signal conditions- not indoors), but the PPS signal from a cheap general-purpose GPS device should be within a few hundred ns. If it has a PPS at all. Otherwise you’re extracting a time stamp from the NMEA data which can be a lot less precise, especially if it’s read by a separate micro running off a separate clock, maybe even with interrupt latencies, etc.

  4. JBeale says:

    Ok, I take that back. Here’s a fairly cheap general-purpose module and it does claim 10 ns jitter:
    http://www.adafruit.com/datasheets/GlobalTop-FGPMMOPA6C-Datasheet-V0A-Preliminary.pdf

  5. mulyono says:

    friend, i found difitcult to read data from gps, when i connected with pc it’s ok n gps can show many correct data but when l connect to micro nd l want come out the data at port c using lcd 16×2, it’s show chinese alfabed, friend give me solution to out from this problem, l really need your help……

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