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Forum Adafruit Flora GPS Module Serial Settings
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  • flora
  • serial
  • gps
  • adafruit
Related

Adafruit Flora GPS Module Serial Settings

rattustrattus
rattustrattus over 11 years ago

Hi, I am having some issues with my adafruit flora gps module, I have tried talking or should I say listening to its serial output at 9600, 19200 but I can't get any sensible output I just get gibberish, does anyone know the full set of serial parameters this module uses as the basic speed is not cutting it, I have checked the internet but looks like it works out the box with the arudino board so any guidance on number of bits, stop bit and parity would be most helpful.

 

thanks in advance image

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  • Former Member
    0 Former Member over 11 years ago

    Normally 8N1. Try 4800 too, just in case.

     

    That module is supposed to be based on their 'ultimate' gps module, so perhaps the info here https://learn.adafruit.com/adafruit-ultimate-gps/downloads-and-resources will be helpful.

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  • rattustrattus
    0 rattustrattus over 11 years ago in reply to Former Member

    I was using 9600 81N but this afternoon had a brain wave .... the power to the ada fruit gps is 3.3v I assume the signals coming out are 3.3v and that going into a serial adapter looking for 5v will never really get the output it should? I see patterns repeated so I am assuming the gps is outputting the kinds of data its supposed to be. My serial adapter is a USB gizmo (2 headed) so I assuming it will only be 5v and this explains the problem?

     

    Any inputs before I go and get myself a 5v to 3.3v serial converter?

     

    Thanks in advance.

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  • shabaz
    0 shabaz over 11 years ago in reply to rattustrattus

    Hi Kevin,

     

    If the GPS module is operating on 3.3V then as long as you only connect the wire that transmits from the GPS module to the PC (leave the other direction disconnected) and ground, then a 5V serial to USB converter will usually work. The converter can understand 3.3V logic level thresholds. If you're seeing a pattern, it's likely the baud rate in incorrect. Although from brief datasheet examination it says 9600 by default and other values by customization, it may be worth trying other baud rates too in case it is customized.

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  • rattustrattus
    0 rattustrattus over 11 years ago in reply to shabaz

    I tried various speeds all the standard ones from 4800 -> 115200 and application that scanned all the speeds I found on a web site and still nothing, played around with data and stop bits as well still nothing that syncs into "real" data, but I am seeing patterns, I have two of the units and get the same behaviour which is why I was thinking the 3.3 -> 5v issue, as my two headed usb adapter was cheap so thought it may be worth a try to do the conversion just to be sure. I suppose worst case it will not do anything image

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  • shabaz
    0 shabaz over 11 years ago in reply to rattustrattus

    Agree, you may as well try a different serial-USB converter. 3.3V is more popular these days anyway so worth getting one.

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  • rattustrattus
    0 rattustrattus over 11 years ago in reply to shabaz

    Shabaz, yes in a nut shell even with the logic converter still same problem, so yes you were right with a USB serial adapter that does 3.3v its fine, so I can only assume a dodgey serial adapter which I will have to investigate further ... happy happy joy joy image

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