UART GPS NEO-7M-C

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UART GPS NEO-7M-C
UART-GPS-NEO-7M-C

UART GPS Module, NEO-7M-C onboard, curved/horizontal pinheader
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Primary Attribute
Category: Modules, GPS/GSM
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Brand: Waveshare
Website
English: Website
Chinese: 官网
Onboard Interfaces
UART
Related Products

Introduction

UART GPS Module, NEO-7M-C onboard, curved/horizontal pinheader

More

Features

  • NEO-7M-C on board, with high-gain active antenna
  • IPX interface, for connecting different active antennas
  • Chargeable backup battery, keeps the ephemeris data when power down, supports hot starts

Parameters

Receiver type: 56 channels, GPS L1(1575.42Mhz) C/A code, SBAS:WAAS/EGNOS/MSAS
Horizontal position accuracy: 2.5mCEP (SBAS:2.0mCEP)
Navigation update rate: 5 Hz maximum (1HZ default)
Capture time: Cool start: 27s (fastest);Hot start: 1s
Tracking & Navigation sensitivity:
Communication protocol: NMEA(default)/UBX Binary
Serial baud rate: 9600
Operating temperature:
Operating voltage: 2.7V~5.0V(power supply input via VCC)
Operating current: 35mA
TXD/RXD impedance: 510Ohms

Applications

Thismodule can be applied to navigator, aircraft positioning, etc.

Hardware

  • A computer with Windows XP/Win7/Win8 OS;
  • An USB to TTL serial module, such as FT232, PL2303, CP2102, etc. If there is a native serial port in the computer, a DB9 to TTL serial module may be used;
  • A UART GPS NEO-7M-C module.


How to use

  • Connect the UART GPS NEO-7M-C module to a serial module. FT232 is applied as the serial module in this document.

The connection between the GPS module and the serial module is listed as the table below.

UART GPS NEO-7M-C module pins Serial module pins
VCC 3.3V/5V
GND GND
TXD RX
RXD TX
PSS*
  • PPS should be connected to the clock pulse output (CPOUT) of a MCU. However, this pin is unconnected, in the case that the GPS module is connected to a computer.
  • Connect the serial module to the computer.
  • Start the serial debugging assistant, and set the serial port as below:
    • Select the corresponding serial port in the Port No option. In this example, COM8 is selected.
    • Baud rate: 9600(default).
    • 8 data bits, 1 stop bit, no parity and no flow control.
  • After finishing the settings, you can see the serial debugging assistant will showmany data in its window, as the figure shows below.

UART-GPS-NEO-7M-User-Manual-1.png

The data shown in the figure abovemeans that the connection is established successfully, but it is unable to perform positioning.

In this case, please place the GPS module to the balcony or near the window, or outdoors for testing, because GPSis less stable in searching signal indoors.

  • After waiting for a while, if the serial debugging assistant lists similar data in itswindow as the figure shows below, it means GPS has performed positioning. Andyou can see that the LED on the module, which remains on when GPS is unable toperform the positioning, is flickering now.

UART-GPS-NEO-7M-User-Manual-2.png

Notice: For its first positioning after cold starts, GPS module normally takes 1-3 minutes to finishing this positioning successfully in the open air with a good weather. So, please be patient. Moreover, if there is a bad weather, it may take more time forpositioning, or even unable to perform positioning sometimes.

  • Install software \u-centersetup-7.0.2.1\u-centerSetup-7.0.2.1.exe (please ensure you computer is connected to Internet).

Start the software, u-center, and you can see the interface as the figure shows below.

UART-GPS-NEO-7M-User-Manual-3.png

  • Click Receiver menu, and select Port option to configure the actual serial port number and Baud rate: 9600.

Click the button

UART-GPS-NEO-7M-User-Manual-4.png

to connect to the UARTGPS NEO-7M-C module.

u-center will show the information as below:

UART-GPS-NEO-7M-User-Manual-5.jpg

  • Install aplug-in, GoogleEarthPluginSetup.exe, for a better view. After finishing the installation, select Google Earth under the View menu in the u-center.

Notes: There may be some differences between the reality and the result shown by Google Earth, because of GPS static drift.

Appendix

  • After a successful positioning, you will receive a lot of information, as the figure shows below.

UART-GPS-NEO-7M-User-Manual-6.jpg

What are the meanings of the information?

We will illustrate these information with an example of $GPRMC,030742.00,A,2232.73830,N,11404.58520,E,0.356,,070314,,,A*77

  • Firstly, openthe document chip PDF\NMEA0183.pdf

Secondly, findthe relative explanations of GPRMC, as the figure shows.

UART-GPS-NEO-7M-User-Manual-7.jpg

  • The meaning of each field in

$GPRMC,030742.00,A,2232.73830,N,11404.58520,E,0.356,,070314,,,A*77is listed as below.

030742.00 UTC time; since the test location is Eastern eight zones, the actual time should be 03+8=11(hour):07(minute):42(second)
A Position state; it indicates valid
2232.73830 Latitude value
N The Northern Hemisphere
11404.58520 Longitude value
E The Eastern Hemisphere
0.356 Ground speed; 0.356knot (1knot =1 nautical mile per hour,which is equivalent to 0.5m per second)
070314 UTC date; it indicates 7th March, 2014
A Mode indication; it is in AssistNow Autonomous mode
77 Checksum; it is the result of XOR operation on the ASCII code of all the characters between $ and *
  • For more detail instructions about u-center, please refer to GPS Datasheets.

Resources

GPS Application notes

GPS-7M Application notes

Software

Support

Mail.png Contact your seller (fast response and most recommended)

or send emails to service@waveshare.com (not fast enough but please be patient) for help.

Our working time: 09:00-18:00 (UTC+8 Monday to Saturday)