Atomic DTU LoRaWAN Base - EU868

The M5Stack Atom DTU LoRaWAN-EU868 is a LoRaWAN programmable data transmission unit (DTU) designed for the 868MHz frequency band, suitable for Europe and other regions using the EU868 band, designed for M5Stack ATOM development boards. This module employs the STM32WLE5 solution, supporting long‑range communication with low power consumption and high sensitivity. The module features a built‑in LoRaWAN protocol stack, supporting Class A, Class B and Class C operation modes for easy connection to various LoRaWAN server platforms such as TTN, ChirpStack, Actility and Tencent Cloud. It also supports LoRa® point‑to‑point (P2P) communication mode, uses a UART communication interface (controlled via the AT command set) for flexible configuration, and integrates an RS-485 communication interface to provide reliable wired connectivity for industrial field devices. The product uses a high‑performance rubber‑duck antenna, with an optimised design to deliver more stable signal coverage and longer communication range, suitable for a variety of complex environments. In LoRaWAN mode, the module can act as a node to connect to a gateway for data collection and management; in P2P mode, it can achieve direct device‑to‑device communication without a gateway. Structurally, the module features a standard 35mm DIN rail slot at its base, allowing direct installation on industrial rails for quick deployment and maintenance in cabinets or distribution boxes.

Features

* Complies with LoRaWAN® 1.0.3 protocol

* Supports 868 – 870 MHz band

* Supports LoRa® P2P (point-to-point) communication

* LoRaWAN activation modes: OTAA, ABP

* Serial communication (AT commands)

* RS485 communication

* High-sensitivity stick antenna

* Low power consumption

* Building block-compatible mounting holes

* DIN rail mounting design

Specifications

LoRa Solution STM32WLE5 @ 256 KB Flash, 64 KB RAM

Supported Band EU868 (868 – 870 MHz)

Protocol Support LoRaWAN® 1.0.3 (Class A, Class B, Class C)

Receive Sensitivity –137 dBm

LoRaWAN Activation Modes Over-The-Air Activation (OTAA) Activation By Personalisation (ABP)

RS485 SP3485EN

Communication Modes LoRaWAN and LoRa® P2P (point-to-point)

Interface UART serial @ default baud rate 115200, supports AT commands

Antenna High-performance stick antenna 50 Ω impedance @ 0.5dBi Total length 195mm, SMA male

Standby Power Consumption (RS-485 interface power)

DC 9V @ 167.98µA

DC 12V @ 178.09µA

Operating Current (RS-485 interface power)

(500 kbps) Data reception: DC 9V @ 50.32 mA

Data transmission: DC 9V @ 51.56mA

(125 kbps) Data reception: DC 9V @ 49.94mA

Data transmission: DC 9V @ 102.79mA

Operating Temperature 0 – 40 °C

Product Size 65.3 × 28.7 × 24.0mm

Product Weight 20g

Resources

* Product Wiki

* Schematic

* RAK3172 datasheet

* Arduino Library

* Arduino QuickStart

* AT Command Manual

Package Contents

* 1x Atom DTU LoRaWAN (EU868)

* 1x Antenna stick ( @ 0.5 dBi, total length 195 mm, SMA male)

* 1x HT3.96 4-pin wiring terminal