Features
- Arduino Yun-compatible development board
- ATmega32u4 microcontroller operating at 16 MHz
- Atheros AR9331 processor operating at 400 MHz
- OpenWrt Linux operating system on the Dragino HE module
- 2.4 GHz WiFi supporting IEEE 802.11 b/g/n
- One onboard RJ45 Ethernet port
- Micro-USB port for programming and power input
- USB-A host port for compatible peripherals and mass storage
- Grove connectors for compatible I2C and UART devices
- Arduino IDE and Yun Bridge Library compatibility
- External WiFi antenna connector
Principle of Operation
The board uses two processors for different tasks. The ATmega32u4 executes Arduino sketches and interfaces with sensors, actuators, and other connected hardware. The Dragino HE module runs OpenWrt Linux and manages network functions through WiFi and Ethernet. The Yun Bridge Library enables communication between the microcontroller and the Linux system, allowing Arduino sketches to request Linux commands, execute scripts, and exchange data.
Applications
- IoT gateway development
- Network-connected sensor monitoring
- Home automation and remote control
- Data logging to USB storage
- Embedded Linux and Arduino development
- Educational projects involving IoT and network communication
- Prototyping connected devices using Grove modules
Pinout
- Digital I/O: 20 ATmega32u4 digital input/output pins operating at 5 V logic.
- PWM: Pins 3, 5, 6, 9, 10, 11, and 13.
- UART: Pins 0 (RX) and 1 (TX), shared with the serial communication interface between the microcontroller and Linux processor.
- I2C/TWI: Pin 2 (SDA) and pin 3 (SCL), with the Grove I2C connector also connected to A4 and A5.
- Analog Inputs: A0–A11 with 10-bit ADC resolution. A6–A11 share digital pin positions 4, 6, 8, 9, 10, and 12.
- SPI: Available through the six-pin ICSP header. SPI-compatible shields should connect to this header.
- AREF: External analog reference input.
- Grove Connectors: Onboard connectors for compatible I2C and UART devices.
- Ethernet: One RJ45 port connected to the Dragino HE module.
- USB Input: Micro-USB connection for programming and power.
- USB Host: USB-A port for compatible peripherals and storage devices.
- Reset Buttons: Separate controls for the ATmega32u4 and Linux system, plus a WiFi reset control.
Specifications
Dragino HE WiFi Module
- Processor: Atheros AR9331
- CPU Clock Speed: 400 MHz
- RAM: 64 MB
- Flash Memory: 16 MB
- Operating System: OpenWrt
- WiFi: 2.4 GHz, IEEE 802.11 b/g/n
- WiFi PHY Rate: Up to 150 Mbps, as specified for the module
- Module Interfaces: 2 x RJ45, 1 x USB Host, 1 x UART, 14 multiplexed GPIOs
- Module Power Input: 3.3 V
ATmega32u4 Microcontroller
- Clock Speed: 16 MHz
- Operating Voltage: 5 V
- Flash Memory: 32 KB, including 4 KB used by the bootloader
- SRAM: 2.5 KB
- EEPROM: 1 KB
- Digital I/O Pins: 20
- PWM Outputs: 7
- Analog Input Channels: 12
- ADC Resolution: 10 bits
Physical and Environmental Specifications
- Dimensions: 75.10 x 53.39 x 11.50 mm
- Operating Temperature: -20°C to 60°C, as specified in the supplied product information
- Antenna: External antenna connection
Resources
Features
- Arduino Yun-compatible development board
- ATmega32u4 microcontroller operating at 16 MHz
- Atheros AR9331 processor operating at 400 MHz
- OpenWrt Linux operating system on the Dragino HE module
- 2.4 GHz WiFi supporting IEEE 802.11 b/g/n
- One onboard RJ45 Ethernet port
- Micro-USB port for programming and power input
- USB-A host port for compatible peripherals and mass storage
- Grove connectors for compatible I2C and UART devices
- Arduino IDE and Yun Bridge Library compatibility
- External WiFi antenna connector
Principle of Operation
The board uses two processors for different tasks. The ATmega32u4 executes Arduino sketches and interfaces with sensors, actuators, and other connected hardware. The Dragino HE module runs OpenWrt Linux and manages network functions through WiFi and Ethernet. The Yun Bridge Library enables communication between the microcontroller and the Linux system, allowing Arduino sketches to request Linux commands, execute scripts, and exchange data.
Applications
- IoT gateway development
- Network-connected sensor monitoring
- Home automation and remote control
- Data logging to USB storage
- Embedded Linux and Arduino development
- Educational projects involving IoT and network communication
- Prototyping connected devices using Grove modules
Pinout
- Digital I/O: 20 ATmega32u4 digital input/output pins operating at 5 V logic.
- PWM: Pins 3, 5, 6, 9, 10, 11, and 13.
- UART: Pins 0 (RX) and 1 (TX), shared with the serial communication interface between the microcontroller and Linux processor.
- I2C/TWI: Pin 2 (SDA) and pin 3 (SCL), with the Grove I2C connector also connected to A4 and A5.
- Analog Inputs: A0–A11 with 10-bit ADC resolution. A6–A11 share digital pin positions 4, 6, 8, 9, 10, and 12.
- SPI: Available through the six-pin ICSP header. SPI-compatible shields should connect to this header.
- AREF: External analog reference input.
- Grove Connectors: Onboard connectors for compatible I2C and UART devices.
- Ethernet: One RJ45 port connected to the Dragino HE module.
- USB Input: Micro-USB connection for programming and power.
- USB Host: USB-A port for compatible peripherals and storage devices.
- Reset Buttons: Separate controls for the ATmega32u4 and Linux system, plus a WiFi reset control.
Specifications
Dragino HE WiFi Module
- Processor: Atheros AR9331
- CPU Clock Speed: 400 MHz
- RAM: 64 MB
- Flash Memory: 16 MB
- Operating System: OpenWrt
- WiFi: 2.4 GHz, IEEE 802.11 b/g/n
- WiFi PHY Rate: Up to 150 Mbps, as specified for the module
- Module Interfaces: 2 x RJ45, 1 x USB Host, 1 x UART, 14 multiplexed GPIOs
- Module Power Input: 3.3 V
ATmega32u4 Microcontroller
- Clock Speed: 16 MHz
- Operating Voltage: 5 V
- Flash Memory: 32 KB, including 4 KB used by the bootloader
- SRAM: 2.5 KB
- EEPROM: 1 KB
- Digital I/O Pins: 20
- PWM Outputs: 7
- Analog Input Channels: 12
- ADC Resolution: 10 bits
Physical and Environmental Specifications
- Dimensions: 75.10 x 53.39 x 11.50 mm
- Operating Temperature: -20°C to 60°C, as specified in the supplied product information
- Antenna: External antenna connection