View source for GPS USB-Port-GPS Module SKU:EZ-0048

=USB-Port-GPS Module=
==Description==
[[File:Gps4.jpg|thumb|right|300px]]
*Support  Raspberry Pi model A, B, A+, B+, Zero, 2, 3 with its' L80-39 GPS chip inside.
*Communicates satellite with UART or USB.
*CP2102 as USB to UART Bridge chip, stable and faster. 
*The L80-39 with 66 search channels and 22 simultaneous tracking channels,it acquires and tracks satellites in the shortest time  at Outdoor.<br>
----
'''<font color=red>Attention</font>'''
This module is fit for outdoor operation. please put the Antana  in the open air.
----

==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
----
Document Download: [[File:Quectel_L80-R_GPS_Specification_V1.0.pdf]]
----

==Parameters==
{| class="wikitable"
|-
!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
|-
|}
[[File:Gps-schama.png|thumb|left|300px]]
<br style="clear:both;" >
----

==Presentation==
{|-
|[[File:Gps2.jpg|thumb|none|200px]]
|[[File:Gps3.jpg|thumb|none|200px]]
|[[File:Gps4.jpg|thumb|none|200px]]
|}
----

==Package includes:==
* 1x USB-Port-GPS(L80-39)  module 
* 1x USB data wire
----

==How to wire it up==
===Uart Style:===
Because of the Serial port issue of  Raspberry Pi 3, Model B, it may cause unexpected problem, we suggest that you do not  connect GPS module with Raspberry Pi directly with GPIO Pins.
*1.You need a '''<font color=red>USB-to-TTL cable</font>''' to connect GPS module and Raspberry Pi ,and you can wire it up like this chart:
{| class="wikitable"
!GPS module!!Wire color
|-
|VCC || <font color=red>Red wire</font>
|-
|GND|| <font color=Black>Black wire</font>
|-
|TXD|| <font color=Green>Green wire</font>
|-
|RXD|| <font color=gray>White wire</font>
|-
|}
{|-
|[[File:Gpsrpi.jpg|thumb|left|300px]]
|[[File:Gpsside.jpg|thumb|none|300px]]
|[[File:GPSconnect.jpg|thumb|none|300px]]
|}
<br style="clear:both;">
*2.Power on Raspberry Pi and login, open a terminal and type following commands if you use raspberry Pi in desktop environment.
----

===USB Style:===
*Just use a microUSB cable connect  Raspberry Pi USB port with GPS module and power on Raspberry Pi. 
|[[File:Gps1.jpg|thumb|left|200px]]
<br style="clear:both;">
----

==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.<br>
<code>
sudo apt-get update && sudo apt-get -y install gpsd gpsd-clients python-gps
</code><br>
2.Reboot your Raspberry Pi and login,  also typing command in your terminal, it will help you reconfigure your gpsd service:<br>
<code>
sudo dpkg-reconfigure  gpsd
</code><br>
3. Start the gpsd service:<br>
<code>
sudo gpsd  /dev/ttyUSB0  -F /var/run/gpsd.sock   </code><br>
4.you can stop the gpsd service:<br>
<code>
sudo killall  gpsd                          
</code><br>
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,<br>
filling the blank with your device name and socket name and path. 
[[File:gpsconfig.png|thumb|left|300px]]
<br style="clear:both;" >
<br>
Start service:<br>
<code>sudo systemctl  enable  gpsd.sock <br>
sudo systemctl  start   gpsd.sock</code><br>
Stop service:<br>
<code>sudo systemctl  stop  gpsd.sock<br>
sudo systemctl  disable  gpsd.sock
</code><br>
Finally, use this command to get information from GPS module.
<br><code>
sudo  cgps -s
</code>
<br>You will see this:
[[File:gpsresult.png|thumb|left|300px]]
<br style="clear:both;" >
----

==Trouble Shooting==
If you can not get the information mentioned before.
You can use this command to check if serial is working properly. 
<code>
cat /dev/ttyUSB0
</code>
it works fine if you see this picture:
[[File:Usboutput.png|thumb|left|300px]]
<br style="clear:both;">
----
==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:

<pre>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**</pre>
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:
**[[File:gpsconfig.png|thumb|left|300px]]
<br style="clear:both;" >
*Question： Can I use it in my car as a GPS receiver ?
**Answer: please see this manual and try lcdgps command.
<pre>
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.
</pre>
** Does it supports the entire NMEA Version 3 sentences or just a subset of it?
Answer:  Yes, it is, Our GPS module support standard NMEA protocol, more information you can read this datasheet: 
[L80 gps protocol specification v1.0.pdf | http://wiki.52pi.com/index.php/File:L80_gps_protocol_specification_v1.0.pdf]
----