GPS + BDS BeiDou Dual-Mode Module AT6558 (DFRobot)

A tiny dual-mode GNSS module for Arduino-class boards

The GPS + BDS BeiDou Dual Module is an AT6558-based multi-mode positioning and navigation module. It supports real-time GPS and multiple satellite navigation systems and is designed for Arduino, Raspberry Pi, STM32 and other boards.

It measures just 13.1 x 15.7 mm and offers both SMA and IPEX antenna ports, so it fits in very small housings.

What the numbers mean

The receiver has 56 channels and outputs data from 1 Hz (default) up to 10 Hz over a TTL serial interface with a 9600 bps default and support for 4800 to 921600 bps. Accuracy is 2.5 m autonomous, and below 2 m with SBAS, in an open field (CEP50). Sensitivity is -148 dBm for cold-start acquisition and -162 dBm when tracking, with hot, warm and cold starts of 1, 28 and 29 seconds. Operating current is under 25 mA continuous and the supply is 3.3 to 5 V.

An LED indicator shows when the module is running, configuration is stored in an onboard E2PROM and a rechargeable XH414 backup battery keeps time and satellite data. The operating temperature range is -40 to 85 C.

Who it suits

Hobbyists building trackers, loggers and drones on Arduino, Raspberry Pi or STM32 boards. The package includes the module, a connector and a pin.

Wiring and use

Connect the module's TX to your board's RX, its RX to your board's TX, plus power and ground. The default serial rate is 9600 bps and the default output rate is 1 Hz, and you can raise the output rate when you need faster updates. Choose the SMA or the IPEX antenna port depending on your enclosure and keep the antenna clear of electronics.

Questions buyers ask

Which systems does it support?

GPS and BeiDou (BDS).

How fast can it update?

From 1 Hz up to 10 Hz.

What power does it need?

3.3 to 5 V, and under 25 mA.

What antenna ports does it have?