The document provides an overview of the Mediatek LinkIt Smart 7688, an open-source Wi-Fi platform designed for developing advanced smart home applications using various hardware and software development kits. It includes specifications of the hardware, software development tools, programming options, and libraries for sensor and peripheral programming. The document aims to assist developers and makers in creating IoT devices and applications using the LinkIt Smart 7688 platform.

1. AjithKP
MediaTekLabs
How to develop advanced
smart home applications
using MediaTek LinkIt™
7688

2. What’s there in the Box ?
2
• LinkIt Smart 7688 Introduction
• Hardware Development Kit
• Software Development Tools
• Demo
• Peripheral Programming
• Demo
• Q & A

3. MediaTek Labs™
ADeveloper Centric Ecosystem
▪ Free global program
▪ One Stop Solution
▪ Supporting developers:
• Device creation
• App development
▪ labs.mediatek.com

4. Enabling Developer & Maker Success
labs.mediatek.com SDKs Technical docs HDKs
Discussion Forums,
FAQ & Dev Support
Newsletter Solutions
Catalog
Partner
Connect
4

5. What is MediaTek LinkIt™ Smart 7688 ?
5
▪ Open source WiFi platform
▪ Runs Openwrt Linux
▪ Two versions of HDKs
▪ Multiple Programming Options

6. What you can do with 7688 ?
6

7. MediaTek LinkIt™ Smart 7688 Platform
7
SOC :MT7688AN
Highly Integrated
compact SOC for IoT
Devices with WiFi
connectivity
SDTs: LinkIt Smart 7688
• OpenWRT
• Python & Node.JS
• Board support
package for Arduino IDE
HDKs : LinkIt Smart 7688
• LinkIt Smart 7688 with
MT7688 MPU
• LinkIt Smart 7688 Duo
with MT7688 MPU + MCU

8. MEDIATEK LINKIT™ SMART 7688 PLATFORM :
SOC 7688AN DETAILS
8

9. LinkIt Smart 7688 :
SOC MT7688AN
9
▪ 1T1R 802.11 b/g/n Wi-Fi radio
▪ 580MHz MIPS 24KEc CPU
▪ RAM: 128MB DDR2
▪ Flash: 32MB
▪ USB2.0 host, SD-XC, I2S/PCM, I2C, PWM, UART, GPIO, SPI, SPI-
slave
▪ eMMC, PCIe are also supported in MT7688 SoC
▪ Max RAM/Flash supported in MT7688 is
▪ RAM: 256MB
▪ Flash: 64MB
MEDIATEK
MT7688AN

10. MEDIATEK LINKIT™ SMART 7688 PLATFORM :
Hardware Development Kit ( HDK)
10

11. LinkIt Smart 7688 : HDK
11
LinkIt Smart 7688 Duo LinkIt Smart 7688
Two type of HDKs : LinkIt Smart 7688 and LinkIt Smart 7688 Duo

12. 12
LinkItSmart7688
• MT7688
• 128MB DDR2
• 32MB Flash
• Chip Antenna (default)
• IPEX Ext Antenna
• microSD
• USB Host
• JTAG

13. 13
LinkItSmart7688Duo
• MT7688 + ATmega32U4
• 128MB DDR2
• 32MB Flash
• Chip Antenna (default)
• IPEX Ext Antenna
• microSD
• USB Host
• JTAG

14. MEDIATEK LINKIT™ SMART 7688 PLATFORM :
Software Development Tools ( SDT)
14

15. LinkIt Smart 7688 SDTs
15
LinkIt Smart 7688 Platform runs OpenWrt
(Chaos Calmer) Linux OS & loaded with range
of packages to enable the development of IoT
device software
You can create applications using
Duo only

16. 16
▪ OpenWrt (Chaos Calmer)
• Built-in OPKG
▪ SSH
▪ Python
▪ Node.js
▪ Firmata
▪ Bridge (from Arduino Yun)
▪ Libmraa (also UPM)
▪ OpenSSL (w/ TLS 1.2)
▪ mDNS
▪ AVRdude (Arduino ICSP)
▪ UVC Webcam support
▪ git
▪ Samba
Software Specification
• BSP related
▪ Ethernet, USB, I2C, UART, GPIO, SPI driver verification
▪ Pin configuration based on HW definition
▪ GPIO control for bypass Bootstrap-pin (LinkIt Smart 7688)
▪ Reset Button Behavior
▪ Wi-Fi Status indicator
▪ Linux Console on UART2
▪ Firmware upgrade by USB (in boot loader)
▪ PWM, I2S driver
▪ Mac80211 Wi-Fi Open source driver (under development)
▪ Will use WCN binary Wi-Fi driver currently
• Setups
▪ Web UI for Initial Setup (Customized UI)
▪ AP Configure File
▪ Pre-defined MenuConfig for required features
▪ Arduino IDE SSH flashing

17. OpenWrt
▪ Linux distribution focus on embedded devices
• Started from 2004
• Typically wireless router
• Full-featured, easily modifiable OS for routers
▪ A framework to build network applications
• Free from the restriction and configuration
provided by the vendor
17

18. Supported Programming Language
18
Language Tools & Libraries Applications Host Platform
C/C++ Cross
Compilation Tool
Chain
• System Programming • OS X
• Linux
Python Python runtime
on Linkit Smart
7688
• Prototyping
• Network
• IoT application
• OS X
• Linux
• Windows
Node.js Node.js runtime
on LinkIt Smart
7688
• Prototyping
• Network
• IoT application
• OS X
• Linux
• Windows

19. Demo
▪ Connect to LinkIt Smart 7688 AP
▪ Log in using WebUI
▪ Login using Putty
▪ Login & transfer file using SCP Tool
▪ Show Openwrt
▪ OPKG Packages
▪ Change to station mode to access Internet
19

20. MEDIATEK LINKIT™ SMART 7688 PLATFORM :
Peripheral Programming
20

21. 21
Wi-Fi
MT7688
Hardware
Sensors
USB Device/SD
Peripheral Connections in LinkIt
Smart 7688
OpenWrt
LinkIt Smart 7688 : Hardware Architecture

22. 22
Software
libmraa
Python Node.js
UPM
App Logic
OpenWrt
Sensors
C
How can I access sensors from LinkIt
Smart 7688 ?
libmraa: C/C++ library with bindings
to JavaScript & Python for I/O
interface in Linux
UPM : A set of sensor drivers written
in libmraa

23. 23
Basic concepts of MRAA
In MRAA, hardware modules such as GPIO, UART, SPI, and PWM are represented as objects
Libmraa is a C/C++ library to interface with the peripheral on LinkIt Smart 7688
import mraa
pin = mraa.Gpio(44)
pin.dir(mraa.DIR_OUT)
pin.write(1)
Import mraa
pin = mraa.Pwm(18)
pin.period_ms(2)
pin.enable(True)
pin.write(0.25) # set duty cycle
import mraa
i2c = mraa.I2c(0)
i2c.address(0x53)
if 0xE5 == i2c.readReg(0x00):
print "Grove - 3-Axis Digital Accelerometer found on I2C Bus"
else:
print "Grove - 3-Axis Digital Accelerometer not found"
GPIO PWM
I2C

24. Demo
▪ Login to 7688 using Putty
▪ Connect to LinkIt Smart 7688
▪ Code walk through mraa python examples
• Simple blink using mraa
• Accelerometer eg using UPM
▪ Code walk through Node.js
▪ Control LED from MCS
24

25. 25
Peripheral Connections in LinkIt
Smart 7688 Duo
MT7688
ATMega32U4
UART
USB Device/SD
Sensors
Wi-Fi
Hardware
OpenWrt
Arduino
LinkIt Smart 7688 Duo : Hardware Architecture

26. 26
How can I access sensors from LinkIt
Smart 7688 Duo ?
3 Programming Models
for LinkIt Smart Duo
Primitive UART
Connection
Firmata Protocol
Arduino Yun Bridge
Library

27. Peripheral Programming : Option-1
27
Software
Python Node.js
UART port
Sensor Drivers
UART Library
App Logic
OpenWrt
Arduino
Sensors
C

28. 28
Software
Firmata
Python Node.js
Sensors
Firmata
App Logic
OpenWrt
Arduino
C
Peripheral Programming : Option-2

29. 29
Software
Sensors
Bridge Library
Sensor Drivers
Bridge Library
App Logic
(MPU provides Wi-Fi & USB Host / SD)
OpenWrt
Arduino
Peripheral Programming : Option-3

30. Summary:LinkItSmart7688VsDuo
Python Node.js
Sensors
Firmata
Python Node.js
Sensors
UART port
Sensor Drivers
UART Library
App Logic App Logic
Sensors
Bridge Library
Sensor Drivers
Bridge Library
App Logic
(MPU provides Wi-Fi & USB Host)
libmraa
Python
Node.j
s
upm
Sensors
App Logic
Sensors
USB Device/SD
LinkIt Smart 7688
Wi-Fi
MT7688 MT7688
ATMega32U4
UART
USB Device/SD
Sensors
LinkIt Smart 7688 Duo
OpenWrt OpenWrt OpenWrt
OpenWrt
Arduino Arduino Arduino
Hardware
Wi-Fi
Software
MPU (MT7688) with OpenWrt as Host MCU (ATmega32U4) with Arduino as Host
Linux Developers
Arduino Developers
(default)
C C C
Firmata

31. Demo
▪ Login to 7688 using Putty
▪ Start camera app
▪ Show 3 scenarios with Duo
▪ Upload Arduino Firmata Sketch
▪ Run python code in Linux side and communicate with Arduino
▪ Run Node.js and control lights using browser high/low
31

32. 580
Mhz
CPU
128MB
RAM
Bread
Board
FF
Python
Node.j
s
32MB
FLASH
USB
HOST
& SD-
XC
RICH
I/O
Interfa
ceFully
Open
source
LinkIt Smart 7688 Advantages

33. Target Audience
33
IoT Gateway Device Developers
OpenWRT Community
Python Developers
Node.Js Developers
Robotics Community
Arduino Yun Community

34. LinkIt Smart 7688 Testimonials
34
“I have recently decided to learn embedded Linux, and have bought
over 14 different development kits. Though they all run Linux, they all
have their pros and cons. So far out of all of them I have liked the
MediaTek LinkIt Smart 7688 the best,”
Mike Moy, Sr. Design Engineer, Versamodule.com

35. How can I get it ?
35
Online Order : http://www.seeed.cc/linkit_smart_7688/

36. Needmoreinfo ?
 Documentation
• Get Started Guides
• Developer’s Guides
• Tutorials & Forums
• HDK information
 Datasheet
 Schematic
 Layout
 Pin-out Diagram
 Toolchains
 Bootloader
• Source codes hosted on
Labs’ repository
 Firmware
• Source codes hosted on
OpenWrt.org
36
labs.mediatek.com

37. Questions?
37
Download Resources:
labs.mediatek.com/7688
MediaTek Cloud Sandbox:
labs.mediatek.com/mcs
Check the Forum:
labs.mediatek.com/forums

38. Copyright © MediaTek Inc. All rights reserved.
38

39. QUESTIONS…?
39