chipfc - smarthome

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Table of contents

Table of contents................................................................................................iChapter 1. Introduction...................................................................................1

About us..................................................................................................1About the project.....................................................................................1

Chapter 2. Hardware design............................................................................3System block diagram .............................................................................3Master unit ..............................................................................................4Slave unit ................................................................................................5

2.3.1 Slave Control ....................................................................................82.3.2 Slave Security ...................................................................................8

2.3.3 Slave Sensor......................................................................................9

Chapter 3. Software design........................................................................... 11Master block..........................................................................................11Slave unit ..............................................................................................12

3.2.1 Slave Control .................................................................................. 123.2.2 Slave Security ................................................................................. 133.2.3 Slave Sensor....................................................................................14

Application on Android phone...............................................................15Chapter 4. Results.........................................................................................17 Chapter 5. Conclusion .................................................................................. 18Chapter 6. Appendix.....................................................................................19

Schematic of MSP430F2618-DEV slave circuit .................................... 19Schematic of CAN interface ..................................................................20Schematic for 220VAC device driver..................................................... 20


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Chapter 1. IntroductionAbout us

Our teams name is ChipFC from Ho Chi Minh City University of Technology.

Our instructor is Mr Vu Trong Thien, lecturer in Computer Science and

Engineering, Ho Chi Minh City University of Technology.

The team has 3 members:

Lam Xuan Hung Pham Huu Nhan Pham Van Vinh

About the projectOur main purpose is to implement a Smart Home system using TI

MCUs. Smart Home is not a new concept, especially in developed countries. However,

in Vietnam, there are not much companies related to this field and the companies do

not really have a complete product. Our team chose this project because of its

interesting and technical nature as well as highly applicability.

The scenario is that there is a dedicated control system which fully meets the

users needs, including the environmental conditions and user preferences, the ability

to operate flexibly, even providing automatic protection and alarming whenever an

intrusion occurs.

In this project, we proposed and implemented a model of a simple house with

living room, garage, toilet which contains installed electrical devices for practical

appliances. A hierarchical system with Master and Slaves will control these devices

according to the given scenario.

Slave devices control the household electrical devices in the rooms, gather

information (environmental conditions) and send them back to the Master. Meanwhile

Master not only control and retrieve data from the Slave, but also communicate with

the user (host) through the connection to their smart phone via Bluetooth - when the

user is inside the house and GSM when theyre outside. This system allows users to

control their home easily and visually without any other devices but their own

cellphones.


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Besides, the Master also allows users to add their own action/scenarios which is

referenced by Master to control devices, make the system more intelligently. These

scenarios possibly based on daytime (day night, weekday) or on special events that

the user specified. The users custom preference can be configured through a virtual

home model on a computer (based on real home architecture), and transfer the

configuration to the Master controller.


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Chapter 2. Hardware designSystem block diagram

According to the scenario of the system described in Chapter 1, we design

block diagram for the system as follows:

The following will explain more details about the design of each block of

Master and Slave in the system.


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Master unitMaster unit is an LM3S811 Eval board of TI. Board contains the ARM Cortex-

M3 LM3S811 microcontroller, integrated USB ICD programmer, OLED LCD for

display and some basic communications. The algorithm development become more

easily thanks to the stable hardware system.

One of the main tasks of the Master is to communicate with the user's mobile

phone via Bluetooth. In order to do this, we use the Bluetooth module RN-42. This

module is connected to the Master board via UART1.

The Master unit will takes care of communicating with Slave via UART0 based

on CAN protocol. The pin U0Tx/Rx of LM3S811 board is connected to a 3.3V CAN


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transceiver module, SN65HV230. The output signals of the CAN module are

differential CAN_high and CAN_low.

Slave unit

Slave units are built on the MSP430F2618 microcontroller to take advantage of

the powerful control ability and low-power consuming characteristic.

To quickly develop applications with various Slave function, firstly, we

implement a small core modules, including the MSP430F2618 microcontroller LQFP-

64, TLV1117 - 3.3V voltage regulator, some essential components and I/O port. The

module is designed to using USB-FET programmer.

The following is an image of MSP430F2618-DEV module.

Power design for MSP430F2618-DEV


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MCU design

Slaves with various tasks use the same core modules but with different

connections depending on their function. In the original design, the system will consist

of 3 Slave:

Slave Controlimplements controlling and monitoring 220VAC devices, allinformation will be controlled by the Master via CAN bus.

Slave Security provides basic communication with the user through thekeyboard and LCD display, which acts as an alarm device, allows users to

log in at home or lock the system when theyre away. When the system is

locked, if an intrusion is detected, an alarm message will be sent to the

users phone.

Slave Sensor acts as an environment monitoring device, gatheringinformation such as lighting power, temperature, humidity, etc. to transfer

to the Master. Depending on the type of information monitored, Slave

Sensor can be placed inside or outside the house. If it is outside, Slave

Sensor will be equipped with a secondary power source, self-


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rechargeable. It can also communicate with the Master via CAN bus or

Wireless communication (TIs Basic RF, ZigBee, SimpliciTI)

2.3.1Slave ControlThe main task is to monitor and control devices 220VAC. Slave Control not

only interfaces with the CAN bus via UART, but also utilizes additional I/O. The 3.3V

output signal is connected to the BT137 Triac module, allows controlling on/off

220VAC devices.

In the current model, we use RC Servo to control the doors. The RC Servo

control signals is PWM with cycle of 20ms and high-level pulse of 1 ~ 2ms, depending

on the angle we want to set. The TAx pin, output of TimerA, is connected to the signal

pins of the RC Servo.Slave Control simulate the lighting management system using ultrasonic

sensors (human detection sensor), it only turns on lights whenever theres someone

inside, and turn off lights in the opposite, for energy saving. In order to do that, Slave

Control uses ultrasonic sensor KS101B (via I2C) and LED for simulation lighting

management system.

2.3.2Slave SecuritySlave Security performs the security controls at the main entrance. When the

system is in the locked state - the owner was not at home, if an unauthorized access

is detected, the system will send an SMS alarm to the specified phone number.

The monitoring task is taken care by InterCom module. Slave Intercom system

acts as a simple communication between the system and the user to perform these

following basic functions:


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User setting status log in or log out. In logged in state, cellphone control function is activated, such as

opening/closing doors, turning on/off the lights ...

In logged out state, the system will perform security monitoring, such aschecking illegal access, SMS alarm if necessary... The owner/user must

enter a valid password to take full control of the system.

Slave Intercom module includes 16x2 characters LCD display and 4x4 keypad

for user command or password input.

Slave Security is connected to a GSM/GPRS SIM900 module for texting,

calling. The Slave communicates with SIM900 module via UART using AT Command

set. The module contains the SIM900, the necessary components such as voltage

regulator, antenna, LED signal and the communication headers.

2.3.3Slave SensorThe Slave Sensor performs monitoring the environment conditions, information

will be collected and sent to the Security Slave via 2.4GHz RF connection. We use the

module CC2520 2.4GHz RF transceiver, which interfaces with MSP430 board via SPI

and GPIO. The compact size CC2520 module with built-in antenna make it more

easily integrated into the system.


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Module CC2520EM

The Slave Sensor provides various information about the environmental

condition, depend on how many kinds of sensor attached into it. In this project, we use

2 types of sensor: sonar for human detection and thermometer for monitoring room

temperature.


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Chapter 3. Software designMaster block

Master operation is shown in the following diagram

Communication with Android via Bluetooth is implemented through Amarino

library. This is an open-source project, originally designed for the Arduino system to

provide communication between Android phones and MCU based hardware. We have

make Amarino source code so that it can operate on the LM3S811 evalution board.

The operation of Amarino is described below:


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CAN communication implemented in this project is a half-duplex one, using

only 2 signal pins (CAN-high and CAN-low) to connect to other devices. This type of

connection is widely used in industry cause of its low cost and noise immunity

compared to standard communication signal, so we used CAN in the.

CAN communication require every device attached to CAN bus having their

own ID. Meanwhile, every message contains the original payload and a header with

source device ID, destination device ID, message length. For example, a message from

Master sent to Slave Control to request the on / off a light bulb will be a byte string:

Master ID Slave ID Length_1 Length_0 Lamp_1 ON/OFF 0xFF

Information displayed on the LCD allows us to visually observe the operation

of the system, and debug the system during development process. Each valid control

commands transmitted from the Master device will be processed then transferred to the

corresponding Slave via CAN, and displayed on LCD. LCD software library isreferenced from the LM3S811 evalution board examples.

Slave unit3.2.1Slave Control

Block diagram of Slave Controls operation:


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According to the protocol described above, the command message from the

Master will only be received by the Slave with the corresponding ID. Then the

message will be process to get the command.

After determining the command, Slave will execute it. The main task of Slave

Control is to turn on/off electrical appliances such as lights, fans, windows

(open/close), thus we utilize Timers IO and Output compare function.

3.2.2Slave SecurityBlock diagram of Slave Securitys operation:

Depending on each state logged on or off, the Slave Security performs

different tasks. In logged off state, it will monitor the main door (in this projects

demo), through a sensor, mounted directly to the door, which continuously check the

doors state (opened or closed). Whenever an intrusion occurs (opening the door


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illegally), Slave Intercom is able to detect it and reports to the Master, alarms by

turning on buzzer and send SMS message to specified phone numbers.

The user has to enter password in order to log in via cellphone. The Slave

Security will scan the keypad and display some information on LCD. The password

will be sent to Master for authentication. User may also change their password through

the keypad.

With a complete GSM module, Slave Intercom just send commands using AT

Command protocol via UART. The following are some simple AT commands:

3.2.3Slave SensorDepend on what type of sensor, Slave Sensor may use I2C, SPI or ADC to read

the sensor data. The interface with the sonar installed in living room is I2C, the Slave

Sensor can identify whether the user is inside the room or not in order to flexibly

control the light. Slave Sensor uses ADC to read out the rooms temperature from the

thermometer. All the value from sensor will be kept inside the Slave memory, updated

and transferred to Master via RF CC2520 2.4GHz module.

The source code for CC2520 is referenced from the "CC2520 software

example" document of TI, using the Basic RF protocol.


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Application on Android phoneApplication on the Android has a GUI that simulates model of the

house. During operation, the application automatically connects to Master module of

the system via Bluetooth and information is displayed on the phones screen as

follow:

When clicking on the room, the screen will display the rooms picture, along

with interactive buttons to input the commands. Based on the design of the home, the

Android app will have a Living room, a Dining room and a Garage.

The hardware button Menu of the phone also is used to provide some

expanded feature like Help, Sync Time, Voice control


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Chapter 4. ResultsWe have designed a home model with size 75cm x 60cm, including a living

room, a dining room, a garage and a toilet, with two doors. The simulation of electrical

appliances such as lights, fans, doors, motors arranged in the picture below.

Hierarchical controlling system consists of a central Master and 3 Slaves:

Control, Security and Sensor placed within the model to be easily observed. Sub-

modules such as CAN bus, 220VAC Triac are mounted below the floor, hidden wiring

is also used to ensure the aesthetic of the design.

At the moment, the system operates just as we describe above. In details, the

user can use an Android based smart phone with Bluetooth to connect to the Master

unit. An application on Android phone with a GUI is activated, the user controls the

devices by pressing keys on the phones display, such as opening/closing doors,

turning on/off lights, fans, etc. The security system allows user login, alarming by

SMS to detect illegal intrusion.


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However, some features are not achieved. For example, the Masters intelligent

controlling based on schedule, or adding some more devices for a better

demonstration.

Chapter 5. ConclusionSmart Home project is a fascinating one, not only for its interesting technical

problems, but also its modernity and applicability as well as long-term development.

During TI MCU Design Contest 2012, we have an opportunity to work with TI

microcontrollers, components, study TI designing style. Although therere some the

limitations, we believe in what we have achieved and look forward to continuing to

develop this project.

Sincerely thanks to the organizer - TI Vietnam for supporting us and other

teams during the contest.


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Chapter 6. Appendix

Schematic of MSP430F2618-DEV slave circuit


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Schematic of CAN interface

Schematic for 220VAC device driver1

2

3

Q?

BTA12

A1

K2

T2 4

T1 6

U?

MOC3020

R?

18012

P?Header 2

1

2

P?

Header 2

F?

FUSE12

P?

Header 2

R?

220 LED?

VCC

ON/OFFC?C

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