Dragino HE

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Dragino HE WiFi IoT Module

HE is a high performance, low cost 150M, 2.4G WiFi module. It is compatible with 802.11b/g/n. provide Ethernet, USB, UART and GPIOs interface. HE use small outline package, it is used widely in WiFi solutions.

HÉ means “core” in Chinese. Intend of HÉ module is to be used as the core of the IoT, WiFi solution.

HE is based on Open Source OpenWrt system. User is free to modify the software for their applications.


  • CPU: ATHEROS AR9331 chipset, which integrates MIPS 24Kc processor, CPU 400MHz, Switch (MAC, PHY) and integrates with MAC, RF, PA and LNA for WiFi.
  • RAM : 64MB;
  • Flash: 16MB
  • Interfaces: 2 x RJ45, 1 x USB Host, 1 x UART, 14 multiplex GPIOs
  • OS: Open Source OpenWrt
  • Power: 3.3v power input
  • WiFi: Support 150M 2.4Ghz WiFi, 802.11 b/g/n
  • Frequency range: 2.4~2.4835GHz
  • Modulation: BPSK, QPSK, CCK and OFDM (BPSK/QPSK/16-QAM/ 64-QAM)
  • Sensitivity @PER: 135M : -65dBm@10%PER; 65M : -65dBm@10%PER; 54M : -68dBm@10%PER;

11M : -84dBm@8% PER; 6M : -88dBm@10% PER; 1M : -90dBm@8% PER

  • Typical Distance: Indoor: 60m (max); Outdoor 150m (max) (with 2 dBi antenna)
  • RF Power: 11n: 13dBm; 11g: 13-15dBm, 11b: 16-18dBm,
  • Connector: I-PEX connector. Provide Optional ANT pin out for SMT


  • Internet of Things
  • Voice over IP
  • Mesh WiFi
  • 3G/4G router
  • Industrial Control

Dimensions and Mechanical

Unit: mm

Dragino Dimension_1

Unit: mil

Dragino Dimension_2


Dragino Mechanical

Pin Definition

HE pin definition
Pin No. Signal Direction Function Remark
1 GND Ground
2 2.0V_Out Output 2.0V output to Ethernet
3 GPIO24 In/Out General I/O
4 GND Ground
5 P0_TX- Out Ethernet Port0 transmit pair
6 P0_TX+ Output Ethernet Port0 transmit pair
7 GND Ground
8 P0_RX- Input Ethernet Port0 receive pair
9 P0_RX+ Input Ethernet Port0 receive pair
10 GND Ground
11 P4_TX- Out Ethernet Port4 transmit pair
12 P4_TX+ Output Ethernet Port4 transmit pair
13 GND Ground
14 P4_RX- Input Ethernet Port4 receive pair
15 P4_RX+ Input Ethernet Port4 receive pair
16 GPIO21 In/Out General I/O
17 GPIO22 In/Out General I/O
18 GPIO18 In/Out General I/O
19 GPIO19 In/Out General I/O
20 GPIO20 In/Out General I/O
21 GPIO23 In/Out General I/O
22 GND Ground
23 VDD33_IN Input Power Supply, 3.3V
24 VDD33_IN Input Power Supply, 3.3V
25 GND Ground
26 GND Ground
27 GPIO28 In/Out General I/O
28 LED6_P4 Output Status LED for Ethernet Port4
29 LED1_USB Output Status LED for USB port
30 LED0_WLAN Output Status LED for Wireless
31 LED2_P0 Output Status LED for Ethernet Port0
32 GND Ground
33 UART_RX Input Serial data in
34 UART_TX Output Serial data out
35 GND Ground
36 2.5v_out Output Reference 2.5v output
37 JumpStart In/Out Failsafe Control Signal, GPIO11
38 GPIO15 In/Out General I/O
39 GPIO16 In/Out General I/O
40 GND Ground
41 Optional ANT Output Optional Antenna output
42 GND Ground
43 RESET Input RESET input, active LOW
44 GND Ground
45 GND Ground
46 GPIO27 In/Out General I/O
47 GPIO26 In/Out General I/O
48 GND Ground
49 USB D+ USB D+ Signal
50 USB D- USB D- Signal

Rough Power Consumption:

Periphery IDLE Bulk File Transfer in all ports
Current @3.3v Power Current @3.3v Power
WiFi only 150ma 495mw 220ma 726mw
RJ45 only 160ma 528mw 205ma 676mw
WiFi + 2 RJ45 210ma 693mw 282ma 924mw
WiFi + 2 RJ45 270ma 891mw 343ma 1131mw
WiFi + 2 RJ45 + USB

Reference Design

Generic IoT Router

This generic router design is a similar design as MS14 and the software and application can refer MS14. Eagle File source: https://github.com/dragino/modules/tree/master/hardware/HE_START_KIT

Reference Design of HE:
Reference Design: Power Input
Reference Design: Ethernet
Reference Design: RS232 and USB
Reference Design: Connectors
Reference Design: Web Failsafe button

Arduino Yun Shield

Arduino Yun Shield is a WiFi, Linux , Ethernet, and USB Shield for Arduino.

Product Link: http://www.dragino.com/products/yunshield/item/86-yun-shield.html

Product Photo:

Arduino Yun Shield -- An open source product made with HE


Quick Start Guide

User Manual


Hardware Source

Software Source

Firmware Download

Software Source

Software of HE module base on OpenWrt Linux, OpenWrt trunk source code can be used for HE.

We also provide two of customized software as a quick start.

Mesh IoT Firmware:

This firmware has enhanced network support such as WiFi Mesh, 3G. It also supports the basic Arduino Bridge features and remote upgrade. Link for this firmware:

Release Note

Source code and How to Compile

Arduino Yun Firmware:

This firmware is derived from the official Arduino Yun firmware with some bug fixed and support more avrs.

Release note

Source code

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