Quectel L76K GPS Module

Contents

L76K GNSS GPS Module User Manual

High-Performance Multi-Constellation GNSS Module

1. Product Overview

The L76K is a high-performance multi-constellation GNSS module, featuring high positioning accuracy, precise timing, and a wide operating temperature range. It is ideal for applications such as vehicle navigation, IoT terminals, and industrial control.

This mini-sized GPS module development board is compact and utilizes the Quectel L76K GNSS Chip. It supports multi-constellation positioning with up to 2.5m CEP accuracy, a 10Hz update rate, and ultra-precise 1PPS timing, making it suitable for navigation, tracking, and timing applications.

Designed for energy-efficient IoT devices, the L76K consumes only 18mA at 3.3V, which helps extend battery life in portable devices, asset trackers, remote sensors, and long-running Meshtastic nodes. Its compact design (20x20x9mm) and 1.25mm 8-pin SMD interface with a 45mm adapter cable make it easy to integrate into drones, handheld devices, IoT boards, and embedded GNSS development systems. It offers stable operation across a wide temperature range from -40℃ to 85℃, ensuring reliable GNSS positioning worldwide.

Front view of the L76K GPS module with its multi-colored connector cable.
Figure 1: Front view of the L76K GPS module with its multi-colored connector cable.
A hand holding the compact L76K GPS module, illustrating its small size.
Figure 2: The L76K GPS module held in a hand, demonstrating its compact size.

2. Key Specifications

Parameter Specification
Model Number L76K GPS Module
Power Supply 2.8V-4.3V
Position Accuracy 2.5m CEP
Supported Constellations GPS, BDS, GLONASS, QZSS
Timing Accuracy 1PPS 10ns
Data Update Rate Up to 10Hz
Operating Temperature -40°C to 85°C
Storage Temperature -45°C to 125°C
Dimension 20*19.5*8.7mm
Weight 8.3g
Interface 1.25mm/8-Pin SMD, 45mm Cable
High-concerned chemical None
Origin Mainland China
Diagram showing the dimensions of the L76K GPS module: 7cm length, 1.96cm width, and 0.92cm height.
Figure 3: Dimensions of the L76K GPS module.

3. Setup Instructions

3.1. Antenna Connection

An active GNSS antenna is required for optimal performance. Ensure the antenna has an unobstructed view of the sky to receive satellite signals effectively.

The L76K module connects via a 1.25mm/8-Pin SMD interface with a 45mm adapter cable.

3.2. Connecting to Heltec Boards

The L76K GPS module is designed to be compatible with various IoT development boards, including Heltec T114 LoRa Module and Heltec V4 LoRa Board. The connection process involves carefully aligning the 8-pin connector of the GPS module with the corresponding port on your Heltec board.

Video 1: Demonstration of connecting the L76K GPS module to Heltec V4 and T114 mainboards.
  1. Identify the GPS connector port on your Heltec V4 or T114 board.
  2. Carefully align the 8-pin connector of the L76K GPS module with the port on the Heltec board.
  3. Gently push the connector into place until it is securely seated. Avoid forcing the connection.
Angled view of the L76K GPS module with its multi-colored connector cable, ready for connection.
Figure 4: Angled view of the L76K GPS module.

4. Operating Guidelines

4.1. Power Supply

  • The input voltage must be stable between 2.8V - 4.3V. A linear regulator or low-ripple switching power supply is recommended to ensure stable operation.
  • Ensure a reliable connection between the system ground and the module ground to avoid interference and ensure proper functionality.

4.2. Signal Acquisition

For optimal signal acquisition, ensure the active GNSS antenna has a clear, unobstructed view of the sky. Any physical barriers can degrade signal quality and positioning accuracy.

Comparison image showing two GPS antennas and their average satellite acquisition times. 'Other GPS antennas' show 3 minutes 28 seconds, while 'Our GPS Antenna' shows 1 minute 29 seconds, indicating faster acquisition.
Figure 5: Comparison of satellite acquisition times, highlighting the faster performance of the L76K module's antenna.

5. Maintenance

  • Keep the module clean and free from dust and debris.
  • Store the module in a dry, well-ventilated area, away from extreme temperatures and direct sunlight.
  • Avoid exposing the module to water or moisture, as it is an electrical product.
  • Handle the module with care to prevent physical damage to components or connections.

6. Troubleshooting

6.1. No GPS Signal / Poor Accuracy

  • Ensure the antenna has a clear, unobstructed view of the sky. Indoor use or dense urban environments can significantly degrade signal quality.
  • Verify that the antenna is securely connected to the module.
  • Check the power supply to the module to ensure it is within the specified range (2.8V-4.3V) and stable.

6.2. Module Not Functioning

  • Inspect all connections for proper seating and continuity.
  • Ensure the input voltage is correct and stable.
  • Avoid plugging or unplugging the module or its wires while the device is powered on.
  • If the module appears physically damaged (e.g., broken cord, damaged interface), do not use it.

7. User Tips

  • **Compatibility Note for Heltec LoRa V4**: Be aware that this L76K GPS module might be physically larger than the original GPS module designed for some Heltec LoRa V4 boards. This size difference could require custom casing or adjustments for portable setups. Always verify dimensions before final integration.
  • For fixed installations, the larger size may not be an issue, but for portable devices, consider the physical fit.
  • The module is compatible with Heltec T114 LoRa Module, Heltec V4 LoRa Board, Heltec Mesh Tracker, Heltec Pocket, Heltec Node, and various Meshtastic and Meshcore device kits.
Comparison image of two GPS modules, one larger (marked with X) and one smaller (marked with checkmark), illustrating potential size differences.
Figure 6: Example of GPS module size comparison, relevant for custom enclosures.

8. Safety Warnings

  1. Child Safety: Keep the device and its cord out of reach of children under 3 years old. Keep away from children unless supervised by an adult.
  2. Intended Use: Do not use this product for purposes other than its intended use (for R&D and learning only).
  3. Pre-Use Inspection: Inspect the product before each use; do not use if damaged (e.g., broken cord, damaged interface).
  4. Installation & Operation: Follow installation and operation guidelines to avoid injury and device damage.
  5. Electrical Product: This is an electrical product; do not expose to water or moisture.
  6. Power Adapter: Use a qualified power adapter matching the device's rated specifications; do not reverse positive and negative poles.
  7. Power On/Off: Do not plug or unplug chips, modules, or wires when the device is powered on.
  8. Handling: Handle with care; do not press, drop, or touch exposed pins with metal tools.
  9. Environment: Place in a well-ventilated and dry area; keep away from heat sources and direct sunlight.

9. Warranty and Support

For warranty information, technical support, or further assistance, please refer to the seller's official website or contact their customer service directly. Keep your purchase receipt for any warranty claims.

A user manual in PDF format is available for download. You can reference it for additional details and diagrams.

© 2024 L76K GNSS GPS Module. All rights reserved.

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