EZ-0048

USB-Port-GPS Module

Description

• This GPS module supports Raspberry Pi model A, B, A+, B+, Zero, 2, 3 with its' L80-39 GPS chip inside.
• This GPS module can communicates satellite with UART or USB.
• This GPS module uses CP2102 as USB to UART Bridge chip, it's stable and faster.
• The L80-39 with 66 search channels and 22 simultaneous tracking channels,it acquires and tracks satellites in the shortest time even at indoor signal level.

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Feature

• -165 dBm sensitivity, 1Hz (Default), up to 5Hz, 66 channels
• At least 100mA current draw to startup.
• PPS output can be used to coordinate time with satellite.
• Internal patch antenna which works quite well when used outdoors SMA connector for external active antenna for when used indoors
• Fix status LED blinks to let you know when the GPS has determined the current coordinates
• EASY™, advanced AGPS technology without external memory
• Support time service application which can be achieved by PPS sync NMEA feature
• Built-in LNA for better sensitivity
• RTC battery-compatible
• 1x8 male headers, USB micro Interface
• includes CP2102 Module Serial Converter USB 2.0 To TTL UART

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Document Download: File:Quectel L80-R GPS Specification V1.0.pdf

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Parameters

Type	value
Satellites	66 acquisition channels, 22 tracking channels
Work Voltage	4.5-5.5V
Weight	4.35g
Maximum Current	100mA MAX
Work Temperature	-40～+85℃
scale	16.6x26x18.6(mm)
GPS	L80-M39
Patch Antenna Size	15.0 x 15.0 x 4.0mm
Position Accuracy	<2.5M CEP
Velocity Accuracy	<1.0m/s
Warm/cold start without ESEY	<35s
Warm/cold start with ESEY	<15s
Acquisition sensitivity	-148dBm
Tracking sensitivity	-165dBm
Update rate	1Hz (Default) up to 5Hz
Baud Rate	4800~115200 bps 9600bps default
Protocols	NMEA 0183
Mount Cable	1*8 Stacking Header USB micro data cable

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Presentation

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Package includes:

• 1x USB-Port-GPS(L80-39) module
  • PS: we do not offer microUSB-cable and GPS antenna, you can purchase it if you need.

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How to wire it up

Uart Style:

• 1.You need a USB-to-TTL cable to connect GPS module and Raspberry Pi, and you can wire it up.
• 2.Power on Raspberry Pi and login, open a terminal and type following commands if you use raspberry Pi in desktop environment.

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USB Style:

• Just use a microUSB cable connect Raspberry Pi USB port with GPS module and power on Raspberry Pi.

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How to use it

1. After power on and login to system. you can open a terminal and typing following command to install packages for GPS module.
sudo apt-get update && sudo apt-get -y install gpsd gpsd-clients python-gps
2.Reboot your Raspberry Pi and login, also typing command in your terminal, it will help you reconfigure your gpsd service:
sudo dpkg-reconfigure gpsd
3. Start the gpsd service:
sudo gpsd /dev/ttyUSB0 -F /var/run/gpsd.sock
4.you can stop the gpsd service:
sudo killall gpsd
5.You can also use systemctl command to manage this service,but at the first, you should modify the configuration file of gpsd in /etc/default/gpsd,
filling the blank with your device name and socket name and path.

Start service:
sudo systemctl enable gpsd.sock sudo systemctl start gpsd.sock
Stop service:
sudo systemctl stop gpsd.sock sudo systemctl disable gpsd.sock
Finally, use this command to get information from GPS module.
sudo cgps -s
You will see this:

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Trouble Shooting

If you can not get the information mentioned before. You can use this command to check if serial is working properly. cat /dev/ttyUSB0 it works fine if you see this picture:

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FAQ

• Question: I use L80-39 GPS module. I choose to connect the GPS to the raspberry using a USB port. I followed these steps:

pi@raspberrypi ~ $ sudo cat /dev/ttyUSB0  
$GPRMC,144034.00,V,,,,,,,090315,,,N*75
$GPVTG,,,,,,,,,N*30
$GPGGA,144034.00,,,,,0,00,99.99,,,,,,*60
$GPGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99*30
$GPGSV,1,1,01,15,,,25*7B

sudo apt-get update
sudo apt-get install gpsd gpsd-clients
sudo dpkg-reconfigure gpsd   
start gpsd automatically: yes
Should gpsd handle attached USB receivers automatically: yes
Device the GPS receiver is attached to: <leave blank>
Options to gpsd: -n /dev/ttyUSB0
gpsd control socket path: <use default>

sudo gpsd /dev/ttyUSB0 -F /var/run/gpsd.sock
cgps -s
**NO FIX**

What should I do for NO FIX problem?

• • Answer: You can modify /etc/defalut/gpsd file and make sure you input the right arguments as following picture:
  • 

• Question： Can I use it in my car as a GPS receiver ?
  • Answer: please see this manual and try lcdgps command.

lcdgps
       A client that passes gpsd data to lcdproc, turning your car computer into a very expensive and 
       nearly feature-free GPS receiver. Currently assumes a 4x40 LCD and writes data formatted to fit
       that size screen. Also displays 4- or 6-character Maidenhead grid square output.

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Purchase Links

52Pi Store

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