Units – Mini GPS/BDS Unit


This is the M5Unit version of GPS, integrates a Zhongke Weibeidou navigation chip AT6558 and a amplification chip MAX2659 used for amplifying antenna signal.

AT6558 is highly performance, supports many types of satellite navigation system,able to receive satellite signals on 56 channels GNSS signal from 6 satellite navigation system, joint location, navigation, timing and more. The module is able to obtain accurate global location information. quick and accurate positioning for anywhere in the city, in the canyon, under the overhead, and inside the car.

The module can be widely used in vehicle monitoring, bus reporting, car navigation, onboard navigation, notebook navigation and other products.

You can plug it into port C on M5core via GROVE cable, which is a standard UART interface.

UART settings :

  • Baudrate(default: 9600bps)
  • Start bits(1 bit)
  • Stop bits(1 bit)
  • Parity(no)


  • Functional specification
    • Positioning accuracy: 2.5 meters (CEP50, open space)
    • Channel: 56
    • Support single system positioning of BDS/GPS/GLONASS satellite navigation systems, or multi-system joint positioning in any combination
    • Support D-GNSS differential positioning
    • Positioning update frequency: 1-10Hz
    • Maximum height: 1800 m
    • Maximum speed: 515 m/s
    • Maximum acceleration: <= 4 G
  • Low power consumption
    • BDS/GPS dual mode continuous operation: <23mA (@3.3V)
    • Standby: <10uA (@3.3V)
  • Sensitivity
    • Tracking: -162dBm
    • Capture: -148dBm
    • Cold start: -146dBm
  • Start Time
    • Cold start: 35 seconds
    • Warm start: 32 seconds
    • Hot start: 1 second
  • Operating temperature: -40~85°C
  • Two Lego-compatible holes



  • Car, ship positioning and navigation
  • Smart law enforcement positioning

Source PinMap

GPS Unit Signal Transmitter (TXD) Signal Receiver (RXD) 5V GND


  • 1x GPS Unit
  • 1x Grove Cable