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L76X GPS HAT User Manual

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L76X GPS HAT

User Manual

OVERVIEW

This is a Raspberry Pi GNSS HAT which supports Multi-GNSS systems: GPS, BDS, and QZSS, with

advantages such as fast positioning, high accuracy, low power consumption, and so on.

It is an easy way to enable global positioning function for your Raspberry Pi.

FEATURES

⚫ Supports Multi-GNSS systems: GPS, BDS, and QZSS

⚫ EASY™, self track prediction technology, help quick positioning

⚫ AlwaysLocate™, intelligent controller of periodic mode for power saving

⚫ Supports DGPS, SBAS (WAAS/EGNOS/MSAS/GAGAN)

⚫ UART communication baudrate: 4800~115200bps (9600bps by default)

⚫ Onboard battery holder, supports ML1220 rechargeable battery, for preserving ephemeris

information and hot starts

⚫ 4x LEDs for indicating the module working status

⚫ Comes with development resources and manual (examples for Raspberry Pi/Arduino/STM32)

SPCIFICATIONS

GPS SPECIFICIATIONS

⚫ Band: GPS L1(1575.42Mhz), BD2 B1 (1561.098MHz)

◼ Channels: 33 tracking ch, 99 acquisition ch, 210 PRN ch

◼ C/A code

◼ SBA: WAAS, EGNOS, MSAS, GAGAN

⚫ Horizontal position accuracy:

◼ Autonomous: <2.5mCEP

⚫ Time-To-First-Fix @-130dBm (EASY™ enabled):

◼ Cold starts: <15s

◼ Warm starts: <5s

◼ Hot starts: <1s

⚫ Sensitivity:

◼ Acquisition: -148dBm

◼ Tracking: -163dBm

◼ Re-acquisition: -160dBm

Summary of content (15 pages)

PAGE 1
L76X GPS HAT User Manual L76X GPS HAT User Manual OVERVIEW This is a Raspberry Pi GNSS HAT which supports Multi-GNSS systems: GPS, BDS, and QZSS, with advantages such as fast positioning, high accuracy, low power consumption, and so on. It is an easy way to enable global positioning function for your Raspberry Pi.
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L76X GPS HAT User Manual ⚫ Dynamic performance: ◼ Altitude (max): 18000m ◼ Velocity (max): 515m/s ◼ Acceleration (max): 4G GENERAL SPECIFICATIONS ⚫ Communication interface: UART ⚫ Baudrate: 4800~115200bps (9600bps by default) ⚫ Update rate: 1Hz (default), 10Hz (max) ⚫ Protocols: NMEA 0183, PMTK ⚫ Power supply voltage: 5V / 3.3V ⚫ Operating current: 13mA ⚫ Operating temperature: -40℃ ~ 85℃ ⚫ Dimensions: 65mm x 30.
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L76X GPS HAT User Manual CONTENT Overview .............................................................................................................................................. 1 Features ........................................................................................................................................ 1 Spcifications .................................................................................................................................. 1 GPS Specificiations .........
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L76X GPS HAT User Manual HARDWARE 1. L76B module 9. 2. CP2102: USB TO UART converter 10. GNSS antenna connector 3. CAT24C32: EEPROM 11. Battery holder: supports ML1220 4. RT9193-33: power manager 5. Backup mode wakeup button 6. Standby switch 7. Indicators: 8. a) RXD/TXD: UART RX/TX indicator b) PPS: GPS status indicator c) PWR: power indicator Raspberry Pi GPIO connector: for USB TO UART port rechargeable battery, for preserving ephemeris information and hot starts 12.
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L76X GPS HAT User Manual Backup mode: FORCE ON button is used to exit Backup mode. Relate to Standby mode, the consumption of Backup mode is lower. In this mode, module stop searching satellite. UART1 is inaccessible, only the backup memory (GPS messages and several user variables used for quick start) in RTC area works. The working current of Backup mode is about 7uA. The only way to wakeup from Backup mode is pull high of FORCE_ON pin.
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L76X GPS HAT User Manual TESTING IN PC HARDWARE CONNECTION 1. Mounting ML1220 battery (No included) to the battery holder in backside. 2. Connect GPS antenna. Wire A by yellow jumpers. Turn the STANDBY switch to OFF. 3. Connect L76X GPS HAT to PC by USB cable, then the PWR indicator lights on 4. Waiting for about 1s. TXD LED become to flash, which mean that data is transmitting 5. Open serial assistant software in PC.
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L76X GPS HAT User Manual 6. Download U-center software from wiki. Unzip it and install. Open U-center software, click Receiver menu, choose Port, and select the correct com port (refer to Devices Manager). Set baud rate: 9600 then click button information after connecting. 7. to connect L76X GPS HAT. U-center display If you want to check the area better, you can install GoogleEarthPluginSetup.
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L76X GPS HAT User Manual DEMO CODES DOWNLOAD DEMO CODE Find the product in Waveshare website, open the wiki and download demo code from wiki.
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L76X GPS HAT User Manual Connect L76X GPS HAT to UNO PLUS by Dupont lines, short B by yellow jumpers L76X GPS HAT Arduino 5V 5V GND GND RXD 2 TXD 3 EXPECTED RESULT It requires about 35s to locate (first time). Open serial monitor and set baud rate to 9600. Data printed first is original data. Time: L76X GPS HAT output time.
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L76X GPS HAT User Manual Plug L76X GPS HAT to Raspberry Pi, short B by yellow jumpers COPY EXAMPLES Insert SD card (which has installed Raspbian image) to PC by card reader Copy Raspberry Pi examples ( the folder we download and unzip above) to BOOT directory of SD card Exit and insert the card to Raspberry Pi, then start. Check it: ls /boot Copy it to /home/pi sudo cp -r /boot/RaspberryPi/ .
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L76X GPS HAT User Manual sudo pip install spidev sudo apt-get install python-imaging sudo apt-get install python-smbus sudo apt-get install python-serial ENABLE SERIAL PORT UART interface should be used for communicating, so we need to enable hardware serial of Raspberry Pi. sudo raspi-config Disable login shell function and then enable hardware serial INSTALL MINICOM minicom is a serial assistant tool for Linux.
PAGE 12
L76X GPS HAT User Manual Install minicom: sudo apt-get install minicom Using minicom: minicom -D /dev/ttyS0 -b 9600 【Note】If you use Raspberry Pi zero, the serial port should be ttyAMA0, you can confirm the port by command: ls -l /dev/serial0 The default baud rate of minicom is 115200, here we use parameters - b 9600 to set it as 9600 If you want to exit, you can press Ctrl + A, press X and choose Yes, then Enter.
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L76X GPS HAT User Manual Data printed first is original data. Time: L76X GPS HAT output time. Code will set the module to Backup mode after running for one miniature, you need to type any character and Enter to wake it up. 【Note】Even the default baud rate of L76X GPS HAT is 9600, it is changed to 115200 in code. If you find that 9600 cannot work next time, please check if it is changed. STM32 EXAMPLE The development board used here is Waveshare XNUCLEO-F103RB, whose chip is STM32F103RBT6.
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L76X GPS HAT User Manual Wire L76X GPS HAT to STM32 board, short B by yellow jumpers. And connect USB to UART (USART1) interface of STM32 board to PC L76X GPS HAT STM32 5V 5V GND GND RXD PA10 TXD PA9 EXPECTED RESULT Open serial assistant software in PC, set baud rate to 115200 Data printed first is original data. Time: L76X GPS HAT output time.
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L76X GPS HAT User Manual FAQ 1. TXD didn’t flashing, data aren’t printed to serial after powering on for about 1 minute. PWR lights normally? - Please check if STANDBY switch is turn to OFF. Press FORCE_ON button for about 1s and check again. If there aren’t data outputted still, check if you connect HAT correctly 2. Why the baud rate doesn’t change after send changing command? - Please check if the current baud rate is correct.