The LinkItTM Smart 7688 Duo is a compact controller board based on MT7688 and ATmega32u4. It is compatible with Arduino Yun sketches and designed for smart home or office IoT prototyping. The board offers sufficient memory and packet storage to enable robust video processing. You can create device applications using Python, Node.js, and C programming languages.

HARDWARE OVERVIEW

SCHEMATIC DIAGRAM

FEATURES​

• 580 MHz MIPS CPU
• Single input single output(1T1R) Wi-Fi 802.11 b/g/n (2.4G)
• Pin-out for GPIO, I2C, I2S, SPI, SPIS, UART, PWM and Ethernet Port
• 32MB Flash and 128MB DDR2 RAM
• USB host
• Micro SD slot
• Support for Arduino API (ATmega32U4)

APPLICATIONS

• IoT/Gateway Device
• Robotics
• Teaching and learning

SPECIFICATION

• MPU
  • Chipset: MT7688AN
  • Core: MIPS24KEc
  • Clock Speed: 580MHz
  • Working Voltage: 3.3V
• MCU
  • Chipset: ATmega32U4
  • Core: Atmel AVR
  • Clock Speed: 8MHz
  • Working Voltage: 3.3V
• Memory
  • Flash: 32MB
  • RAM: 128MB DDR2
• GPIO
  • Pin Count: 3(MT7688AN), 24(ATmega32U4)
  • Voltage: 3.3V
• PWM
  • Pin Count: 8(Atmega32U4)
  • Voltage: 3.3V
  • Max. Resolution: 16 bits(customizable)
• ADC
  • Pin Count 12(ATmega32U4)
  • Resolution: 10 bits
• External Interrupts: 8
• SPI/SPIS
  • Pin numbers: S0, S1, S2, S3
  • Max Speed: 4MHz
• I2C
  • Pin Number: D2/D3
  • Speed: 400KHz
• UART Lite
  • 1 for ATmega32U4, 1 for MT7688AN
  • Pin Number: P8/P9(MT7688AN), D0/D1(ATmega32U4)
• USB Host
  • Pin Number: P6/P7
  • Connector Type: Micro-AB
• Communication
  • Wi-Fi: 1T1R 802.11 b/g/n (2.4G)
  • Ethernet: 1-port 10/100 FE PHY
  • Pin Numbers: P2/P3/P4/P5
• User Storage: SD Card Micro SD/SDXC
• Size: 60.8×26.0mm

DOCUMENT

• Hardware Schematic files
• Manual
• OpenWrt
• MediaTek LinkIt? Smart 7688 Resources:
• How to flash the firmware via a USB drive
• Certificates
• Mediatek