L76X GPS Module

L76X GPS Module UART GPS Module, supports GPS, BDS and QZSS

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Primary Attribute Category: Modules, GPS/GSM {{{userDefinedInfo}}}: {{{userdefinedvalue}}} Brand: Waveshare

Website International: Website Chinese: 官网

Onboard Interfaces

Related Products L76X GPS HAT L76X GPS Module NEO-M8T GNSS TIMING HAT MAX-7Q GNSS HAT MAX-M8Q GNSS HAT GSM/GPRS/GPS Shield (B) GSM/GPRS/GNSS HAT SIM800C GSM/GPRS HAT ZED-F9P GPS-RTK HAT

Introduction

UART GPS Module supports GPS, BDS, and QZSS.

More

Resources

• User Manual
• Schematic
• 3D Drawings

Demo code

• Code
• Github

Datasheet

• Quectel GNSS Flash EPO Application Note V1.0
• Quectel GNSS FOTA User Guide V1.0
• Quectel GNSS Low Power Mode Application Note V2.0
• Quectel GNSS SDK Commands Manual V1.4
• Quectel L76 GNSS Presentation V1.3
• Quectel L76 Series GNSS Protocol Specification V3.3

Software

• SSCOM
• SecureCRT.7z
• u-center
• GoogleEarth Application

FAQ

Question:Why is the location not accurate?

 Answer:

The positioning accuracy is related to the environment in which it is located. First, it is rainy due to weather and there is a lot of moisture in the air, which affects the transmission of signals. This is also the reason why the mobile phone signal is weaker in summer. It is rainy and humid in summer, coupled with high-temperature evaporation, which increases the moisture in the air, thus affecting the transmission of satellite signals. Due to the factor of two high-rise buildings, it is easy to cause poor satellite signals or signal offset problems next to some high-rise buildings. In low-rise buildings or underground buildings, such as underground parking lots, underground shopping malls, subways, tunnels, etc., due to the occlusion of walls, indoor signal attenuation is very large, which forms a weak signal coverage, so the positioning is inaccurate, the error is large, etc., and it is also easy to cause the positioning to be inaccurate under the obstruction of some mountains. The third is the number of satellites. The number of satellites placed over rural and remote areas is small, resulting in large position deviations. Four satellite signals will be affected by factors such as atmospheric ionosphere, ground buildings, forests, water surfaces, etc., resulting in deviations in calculations.

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Question:Why am I still not receiving data when I'm outdoors?

 Answer:

Please check whether the antenna is connected well, and the side with words should face down, and the receiving side of the antenna is on the side without words.

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Question:Why is it inconsistent with the location of the mobile phone?

 Answer:

This module positioning only relies on satellite positioning alone, and mobile phone positioning not only relies on satellite positioning but also relies on the combination of various positioning systems such as AGPS (Assisted Global Satellite Positioning System), and LBS base station positioning, Wifi positioning, Bluetooth positioning, etc. The positioning has a faster positioning speed, and the accuracy is different in different environments, and the multiple satellite systems supported by the GPS signal of the mobile phone are inconsistent with the multiple satellite systems supported by the module. Therefore, there is a certain difference between the data of the module and the mobile phone positioning.

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Question:Why the module baud rate have not been changed after sending the change command?

 Answer:

First, ensure that the baud rate of the command sent is the same as the baud rate output by the serial port. When the module searches for a large number of satellites, the baud rate setting from high to low may not be able to be modified, because the baud rate is too low. To send all data, consider using the SET_NMEA_OUTPUT command to reduce the output data field, and then modify the baud rate.

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Question:How to parse the obtained positioning information?

 Answer:

The following takes GNRMC as an example to parse the obtained positioning information, as shown below:

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Question:Why does running the sample program not print location information, nor does opening minicom？

 Answer:

It is because the hardware serial port is not enabled.

Enable UART Port

Open the terminal of the Raspberry Pi, and input the following commands to enter the configuration interface:

sudo raspi-config

Choose Interfacing Options -> Serial, close Shell visit, and enable hardware UART port:

The baud rate should adopts 9600.

sudo minicom -D /dev/ttyS0 -b 9600

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Question:How to connect the pps output. How do I do that?

 Answer:

L76X GPS Hat 1PPS GPIO pin
Solder a wire from pin 4 on Q1 to GPIO 4 on the Raspberry Pi.

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