LinkIt ONE Workshop
About This Workshop
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What LinkIt ONE is
What can LinkIt ONE do
Example
Resources
What is LinkIt?
GPIO
I2C
SPI
UART
Wearable/IOT
Device
Bluetooth
GSM
GSM
GPRS
Wi-Fi
Some images from icons8.com
3
Prototyping Wearable and IOT Devices
Easily
GPIO
I2C
SPI
UART
Wearable/IOT
Device
Bluetooth
GSM
GSM
GPRS
Wi-Fi
Some images from icons8.com
4
®
LinkIt ONE
ARM7 EJ-S
GSM
GPRS
Bluetooth
Wi-Fi
GPS
Audio
microSD
$79 USD
5
LinkIt ONE
▪ All-in-one connectivity
▪ Similar pin layout to Arduino Uno
+
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BLE Shield
Wi-Fi Shield
GSM/GPRS Shield
Arduino Uno
+
GPS Shield
MP3 Shield
Some images from arduino.cc and seeedstudio.com
LinkIt ONE
LinkIt SDK for Arduino
▪ A Plug-in for Arduino IDE
Sketch
On Board LED
MediaTek LinkIt Platform
System-on-Chip
LinkIt OS
LinkIt HDK
LinkIt SDK
Aster (MT2502)
– the world’s
smallest SoC for
Wearables
Feature rich OS
to power
Wearables and
IoT devices
Hardware
boards based
on reference
designs by
MediaTek
Plug-ins for
Arduino,
libraries for the
LinkIt APIs, and
board firmware
update tool
+
Companion
chipsets for
WiFi and GPS
+
+
First offering:
LinkIt ONE
from Seeed
Studio
labs.mediatek.com/linkit
First offering:
SDK for
Arduino
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LinkIt ONE Hardware
Hardware (Front View)
GPIO (3.3V)
Seeed GROVE
system
Headset
Jack
SPI
USB Jack
Battery Jack
Reset Key
Power Out
A/D & GPIO
LinkIt ONE Hardware
GROVE system
▪ Simplifies hardware setup
Grove System
Hardware (Back View)
GNSS
MT3332
GPS/GLONASS/BEIDOU
GPS Antenna
SIM/SD Slot
Wi-Fi / BT
Antenna
GSM
Antenna
Wi-Fi
MT5931
Main Processor
BT GSM
MT2502
Antenna
GPS+GLONASS Antenna
GPS Antenna
SIM/SD Slot
Wi-Fi / BT
Antenna
Wi-Fi / BT
Antenna
GSM
Antenna
GSM
Wi-Fi
Antenna
MT5931
MT2502
Aster
Photo with coffee bean here
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Aster (MT2502)
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Size: 5.4x6.2x1.0mm
ARM7EJ-S
BT 3.0/4.0
PMU
4MB Memory
2G Modem
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LinkIt ONE Schematics
▪ Open board schematics
▪ labs.mediatek.com (Dev Tools & Resources > MediaTek LinkIt > HDK Intro)
Hardware Spec
▪ Microcontroller
• MT2502A (Aster) ARM7 EJ-S 260MHz
▪ Memory
• Flash 16MB RAM 4MB
• SD card: up to 32GB (class 10)
▪ Power
• 3.7V~4.2V Lithium battery jack recharge through USB
▪ Digital I/O
• 16 pins (D0~D13 SDA SCL) 3.3V 0.3mA~3mA
▪ Analog Input
• 3 pins (A0 A1 A2) 0~5V fixed reference voltage
▪ Pulse Width Modulation
• 2 sets
• Max Resolution: 13bit
• Max Frequency@Resolution: 1.6kHz@13bit 50.8kHz@8bit 800kHz@4bit
Hardware Spec
 External Interrupts
• 2 pins D2 D3
 I2C
• 1 set Master only
 GSM/GPRS
• 850/900/1800/1900 MHz
• GPRS Class 12
 Bluetooth
• EDR BLE (Dual Mode)
 SPI
• 1 set Master only
 UART
• 1x UART on USB
 mapped to “Serial”
• 1x UART
 D0 D1 3.3V
 mapped to “Serial1”
 Wi-Fi
• 802.11 b/g/n (150Mbit/s)
 GPS
• GPS/GLONASS/BEIDOU
LinkIt SDK for Arduino
LinkIt SDK for Arduino
▪ A Plug-in for Arduino IDE
RTOS Inside
Thread N
Arduino Thread
LinkIt Run-time Environment
Arduino Sketch
Framework
Arduino Porting Layer
(source code)
LinkIt OS
preemptive(binary)
multi-threaded
Hardware
Middleware & Protocols
(Multimedia Graphic Peripheral Modem etc)
Thread A
MT2502
(Aster)
Driver
Thread B
MT3332
(GPS)
Driver
Embedded OS
Thread C
MT5931
(Wi-Fi)
Driver
SDK Features
Arduino core functions
LinkIt ONE functions
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Digital I/O
Pulse-Shift I/O
Analog Input
Serial
Time and delay
Interrupts
Math
Servo
Stepper
SPI
I2C
GSM SMS
GPRS TCP and UDP socket
Wi-Fi TCP and UDP sockets
Bluetooth Serial Port Profile
GPS NMEA format
Audio MP3 AAC
SD/Flash FAT32
EEPRROM-like persistent
store
Resources
▪ labs.mediatek.com
• API reference guide and sample code
▪ IDE
• sample code
SMS
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Sending and receiving SMS
Classes prefixed with L
Waiting for module ready
Begin composing SMS to
remote number
 Finish and send the
message
GPRS Client Socket
 TCP socket connection
 HTTPS will be support
through SDK update
The Demo Kit
▪ Search “IOT” and “LinkIt” on GitHub
SMS Lamp Switch
▪ Send “on” and “off” to control the lamp
• Receiving SMS messages
• Turning lights on and off
GPIO
I2C
SPI
UART
Bluetooth
GSM(SMS)
Receiving SMS Messages
▪ setup()
• Initialize SMS module
▪ loop()
• Checking SMS module
• Parse it
Turning Lights On and Off
▪ The driving current small (0.3mA~3mA).
▪ For signal processing only
▪ Switch circuits may be required for components
with larger driving currents e.g. LEDs motors
http://www.electronics-tutorials.ws/blog/relay-switch-circuit.html
Sample Code Resource
▪ MediaTek Labs
▪ IDE Sample
▪ Seeed Studio
Resource Portals
▪ labs.mediatek.com/linkit
▪ www.seeedstudio.com/linkitone
Q&A
Copyright © MediaTek Inc. All rights reserved.