Want to add Wi-Fi to your IoT project? This 30 minute webinar, presented by technical consultant Ajith KP, demonstrated how to program (using Arduino and Python) for peripheral sensors connected to the MediaTek LinkIt Smart 7688 Duo’s microcontroller and how to communicate between the microcontroller and the MT7688 SOC. Three ways to undertake the peripheral programming for the MediaTek LinkIt Smart 7688 Duo were covered: 1) Using a primitive UART connection 2) Using the Firmata protocol 3) Using the Arduino Yun Bridge Library A recording of the live event can be found at http://home.labs.mediatek.com/technical-mediatek-linkit-smart-7688-webinar-recording-available/

1. AjithKP
MediaTekLabs
MediaTek
LinkIt™ Smart 7688 Duo :
Peripheral Programming
using Arduino & Python

2. Topics
2
WHO IS MEDIATEK
What is MediaTek Labs
LinkIt Smart 7688 HDK’s
LinkIt Smart 7688 Software tools
Peripheral Programming
Challenge
Questions

3. 27 offices
across 12 countries
A Global Company
USA
UK
Denmark Sweden
Dubai
India
Singapore
Mainland China
Korea
Japan
Finland
Taiwan Hsinchu HQ
3

4. Source (ranking by revenue of 2014): Strategy Analytics, Gartner, IDC, IC Insight, iSuppli and MediaTek company data
* Combined with MStar. Source (Rankings by volume): Strategy Analytics, Displaysearch, iSuppli , MediaTek company data
Feature phone
#1
Digital TV*
#1
Optical disc
drive
#1
DVD/BD
player
#1
Smartphone
#2
Tablets
#2
Connectivity
network
#3
Leading Market Position with
Cross-Platform Synergy
2016-03-03Copyright © MediaTek Inc. All rights reserved.
4

5. MediaTek Powered Products
5
▪ New Amazon Kindle Tablets▪ Sony Android TVSmartphone HTC M9+ / Sony Xperia E4

6. Topics
6
Who is Mediatek
WHAT IS MEDIATEK LABS
LinkIt Smart 7688 HDK’s
LinkIt Smart 7688 Software tools
Peripheral Programming
Challenge
Questions

7. MediaTek Labs
ADeveloper Centric Ecosystem
̶ Global program – free
to join
̶ Supporting developers:
̶ Device creation
̶ App development
̶ Services
̶ labs.mediatek.com

8. 2016-03-03Copyright © MediaTek Inc. All rights reserved. 8
Enabling Developer and Maker Success
̶ Dev resources
̶ Insights and inspiration
̶ Access to hardware
̶ SDKs for makers (Arduino),
professional developers (C/Eclipse)
and Linux (OpenWrt and Ubuntu)
̶ Technical support
̶ Peripherals (sensors, etc)
̶ Cloud management of
device data
̶ Developer advice & matchmaking
̶ Design, production &
go-to-market help
Go from idea to prototype to product

9. MediaTek LinkIt™ portfolio
Software and hardware development platforms for wearables & IoT
Copyright © MediaTek Inc. All rights reserved.
LinkIt Assist 2502
labs.mediatek.com/2502
̶ Wearable form factors
̶ For professional developers
(C/Eclipse)
LinkIt ONE
labs.mediatek.com/linkitone
̶ Unrivalled connectivity on a
single board
̶ For DIY & maker community
(Arduino)
LinkIt Connect 7681
labs.mediatek.com/7681
̶ The simple way to Wi-Fi enable
your devices
̶ For low-cost smart home or
office deployment
LinkIt Smart 7688
labs.mediatek.com/7688
̶ Open-source Wi-Fi platform for
a more connected world
̶ OpenWrt Linux, Python, Node.js,
Arduino

10. 2016-03-03Copyright © MediaTek Inc. All rights reserved. 10
RapidlygrowingLinkItcommunity

11. Topics
11
Who is Mediatek
What is MediaTek Labs
LINKIT SMART 7688 HDK’S
LinkIt Smart 7688 Software tools
Peripheral Programming
Challenge
Questions

12. MediaTekLinkIt™Smart7688
Theopen-source Wi-Fiplatform foramore
connected world
12
System-on-Chip
MediaTek MT7688AN, a
highly Integrated
compact SoC for IoT
devices with Wi-Fi
connectivity
Software Dev Tools
• OpenWrt
• Python & Node.js
• Arduino Plug-in
LinkIt Smart 7688 HDKs
• LinkIt Smart 7688 HDK
with MT7688 MPU
• LinkIt Smart 7688 Duo
with MT7688 MPU +
MCU
• Firmware & bootloader

13. LinkIt Smart 7688 HDKs
13
LinkIt Smart 7688 Duo
(Arduino Compatible)
LinkIt Smart 7688
Two versions of HDK
Run OpenWrt Linux
Multiple programming options

14. MEDIATEK LINKIT™ SMART 7688 DUO
14

15. 15
USB Host
USB Power &
MCU USB port
MPU Reset
Button
Wi-Fi Reset
Button
MCU Reset
Button
MT7688AN + 128MB DDR2
(Under shielding cover)
Micro SD
Slot
Atmega32U4
32 MB Flash
LinkItSmart7688Duo

16. Hardware Spec
▪ MPU & MCU
• MT7688 - 580MHz MIPS 24KEc CPU
• ATmega32U4
▪ Memory
• Flash 32MB
• RAM 128MB DDR2
• SD card
▪ Power
• USB 5 V
▪ Digital I/O
• 24 pins + (3 pins on the MT7688AN)
▪ Analog Input
• 12 pins

17. Hardware Spec
 External Interrupts
• 8 pins (S0, S1, S2, S3, D8, D9,
D10, D11)
 I2C
• 1 set
 SPI
• 1 set (Master & Slave)
 UART
• UART Lite
 1 Set MT7688AN
 1 Set ATmega32U4
• UART host
 1 Set MT7688AN
 Wi-Fi
• 802.11 b/g/n (2.4G)
 PWM
• 8 pins (D3, D5, D6, D9, D10,
D11, D12, D13 )

18. Topics
18
Who is Mediatek
What is MediaTek Labs
LinkIt Smart 7688 HDK’s
LINKIT SMART 7688 SOFTWARE TOOLS
Peripheral Programming
Challenge
Questions

19. LinkIt Smart 7688 SDTs
19
Running OpenWrt Linux (Chaos Calmer) OS
Loaded with a range of packages to enable
the development of IoT device software
Multiple programming options
Duo only

20. 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
20

21. OpenWrtPackages
 Dropbear
• A light-weight SSH server
 cURL
• Command line tool for transferring
data with URL syntax
 stty
 UVC USB camera support
• Kernel drivers for USB camera
support
 Python
 pySerial
• Library providing serial port access
functions in Python
 OpenSSL
 Node.js
 node-serialport
• Library providing serial port access
functions in JavaScript
 Bridge library
• Arduino Yun Bridge library
 libmraa
• C/C++ library with bindings to
JavaScript and Python for I/O
interface in Linux
 UPM
• A set of sensor drivers written in
libmraa
 AVAHI
• Facilitates service discovery on a
local network using the
mDNS/DNS-SD protocol suite
21

22. Supported Programming Languages
22
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

23. Topics
23
Who is Mediatek
What is MediaTek Labs
LinkIt Smart 7688 HDK’s
LinkIt Smart 7688 Software tools
PERIPHERAL PROGRAMMING
Challenge
Questions

24. Peripheral Connections in
LinkIt™ Smart 7688 Duo
24
Hardware
MT7688
ATMega32U4
UART
USB Device/SD
Sensors
Wi-Fi
OpenWrt
Arduino
LinkIt Smart 7688 Duo : Hardware Architecture

25. Peripheral Programming Models
25
3 Programming
Models
Primitive UART
Connection
Firmata
Protocol
Arduino Yun
Bridge Library

26. Peripheral Programming
PrimitiveUARTConnection
26
Software
Python Node.js
UART port
Sensor Drivers
UART Library
App Logic
OpenWrt
Arduino
Sensors
C

27. int c = Serial1.read();
if (c != -1) {
switch(c) {
case '0':
digitalWrite(13, 0);
break;
case '1':
digitalWrite(13, 1);
break;
}
}
s=serial.Serial("/dev/tty
S0", 57600)
def loop():
s.write("1")
time.sleep(1)
s.write("0")
time.sleep(1)
27

28. 28
Software
Firmata
Python Node.js
Sensors
Firmata
App Logic
OpenWrt
Arduino
C
PeripheralProgramming
FirmataProtocol

29. 29
MCU – MPU Communication

30. Sketch
provided by
Library
board = Arduino('/dev/ttyS0')
while True:
board.digital[13].write(1)
sleep(0.5)
board.digital[13].write(0)
sleep(0.5)
30

31. 31
 PyFirmata
• pip install pyfirmata
• Example code : https://github.com/tino/pyFirmata
• Arduino side : Use StandardFirmata Sketch
 PyMata
• pip install pymata
• Example code : https://github.com/MrYsLab/PyMata
• Arduino Side : Use FirmataPlus sketch
ProgrammingwithFirmata Protocol

32. 32
Software
Sensors
Bridge Library
Sensor Drivers
Bridge Library
App Logic
(MPU provides Wi-Fi & USB Host / SD)
OpenWrt
Arduino
Peripheral Programming
Bridge Library

33. Everything is
controlled
through Arduino
Activate Bridge
Library
# uci set
yunbridge.config.
disabled=’0’
# uci commit
# reboot
33
Arduino Bridge Library : https://www.arduino.cc/en/Reference/YunBridgeLibrary

34. BridgeLibrary
 Process
• Process is used to launch
processes on the Linux
processor, and other things like
shell scripts.
 Console
• Console can be used to
communicate with the network
monitor in the Arduino IDE,
through a shell. Functionally, it
is very similar to Serial.
 FileIO
• An interface to the Linux file
system. Can be used to
read/write files on the SD card.
 HttpClient
• Creates a HTTP client on Linux.
Acts as a wrapper for common
CURL commands, by extending
Process.
 Mailbox
• An asynchronous, session-less
interface for communicating
between Linux and Arduino.
 And more...
34

35. MediaTek Cloud Sandbox
 RESTful API’s
 Visualize Data
 FOTA
 Data channels
• Float
• GPS location
• Video
• Pictures
• Controllers 35

36. Hardware
36
LinkIt Smart 7688
Duo
Breakout board
Grove Sensors
and Servo

37. LinkIt Smart 7688 Duo Testimonials
37
“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

38. What’s Next ?
38
▪ March 8th, 2016 - Bluetooth Low Energy
communication with MediaTek LinkIt ONE
▪ March 17th, 2016 - From concept to
consumer – make your IoT idea a commercial
reality
More Info : http://home.labs.mediatek.com/march-
webinars-make-the-most-out-of-your-iot-project/

39. Questions?
39
Download Resources:
labs.mediatek.com/7688
MediaTek Cloud Sandbox:
labs.mediatek.com/mcs
Check the Forum:
labs.mediatek.com/forums

40. Copyright © MediaTek Inc. All rights reserved.
40