1. Final Presentation Smart-Home Smart-Switch using Arduino
Department of Electrical Engineering
Students: Edan Shunem, Itzik Cohen
Supervisor: Mony Orbach
Semester: Winter, 2016
Date: 09/03/2016
הצגה עצמית

2. Presentation Outline Motivation Project Goal Block Diagram: Hardware
Physical Diagram
Block Diagram: Communication
Problems Encountered
Software Server, GUI, App, Controllers, DB
Arduino Software UML
Controllers Flowchart
Tests
Live Demonstration

3. Motivation
Home automation makes our lives easier, more convenient and can allow lower energy consumption.
Turn on devices remotely (water boiler, heaters, etc.)
Schedule devices to work in specific times (lights, AC, coffee machine, radio, etc.)
Monitor your energy consumption

4. Motivation
But unfortunately, today, smart homes technology is very expensive.
Controlling devices and installation are expensive.
Requires 3rd party installations.
Often needs to be implemented in the house’s infrastructure.

5. Project Goal
Design a remotely controlled Multifunction Outlet Power Strip.
The power strip will be controlled with an Arduino Processor using WIFI via a designated server.
The power strip will have local functionality and automatic fail-safes.

6. Block Diagram: Hardware
Digital
5V DC Converter
220V Source
Arduino Nano Processor
WIFI LED
TCP LED
220V Relay
220V Relay
220V Relay
220V Outlet
220V Outlet
220V Outlet
3.3V DC Converter
ESP8266
WIFI
RTC
Sensor
Sensor
Sensor
Analog
Server
Heat sensors – detect outlet heat level and stops functionality when overheating (safety)
Hall effect sensors – detect electromagnetic fields to determine current (energy monitoring)
220V relays – switching the voltage to the outlets on and off (via aeduino control(
ESP8266
WIFI
Arduino Nano Controller
Heat Sensors
220V Relay x3
220V Outlets x3
x3 Hall effect Sensors

7. Physical Diagram 220V Source PC Relay Module x3 RTC 5V DC Converter
GND 5V PC
Mini USB
D11<->TX
D12<->RX
220V Source
5V DC Converter
3.3V DC Converter
220V
3.3V
Relay Module x3
Hall Sensors x3
RTC

8. Block Diagram: Communication
User
Via PC or Smartphone
JAVA Application
ESP8266 WIFI
Router
mySql Database
Server Socket Handler
Arduino Controller
Strip

9. Problems Encountered Arduino Environment.
Integration of ESP with Arduino Nano:
ESP was a new component, required library implementation.
Reliable Communication.
Server platform:
Attempts with Wampserver (PHP, Apachi, MySQL), problematic blackbox.
Considered implementing server in C++ but was time consuming.
Solution: Implemented a JAVA server. Pros: Cross-Platform, dedicated libraries for socket handling, GUI(!), OOP, Interface with SQL. Cons: required learning JAVA.

10. Problems Encountered Embedded programming limitations: RTC:
Limited Arduino (Nano) memory, communication via UART, Small buffer.
RTC:
Arduino Nano has no inner timer, required for independent functionality.
Handle clock skew.
Identify communication loss.
Solution: save last message time from server, compare to RTC time.

11. Block Diagram: SW Server
GUI
Thread
Scheduler Thread (Sensors)
Client Listener
Main Thread
Client Thread
Controller
Client:
JAVA App
Android App
Arduino1
Arduino2

12. Server GUI Server GUI for communication monitoring.
Connect/Disconnect button, choose port.
Events logging (retries, messages, exceptions).

13. Client Thread Controller
Wait for a message from the Arduino\Application and handle as a controller.
Parses messages: <SRC>#<DEST>#<SW>#<OP>#<VAL>
When changing status, Update the SQL.
Database Handler: Wrapper for DB, handles communication with DB, has SET/GET methods.

14. Client Thread Controller
Perform requested commands:
Send Open\Close request from the Application to Arduino.
Get Ack from Arduino and update the Database.
Handle Timer Request from Application and Ack Timer from Arduino and update the Database.
Send Request for Temperature and Hall Effect values from Arduino and update the Database upon response.
In case of a high temperature send a stop command to Arduino.

15. MySQL Database A free web database, always online, can be customized.
Defines tables and fields, set default values.
Handles communication between Server and Application.
Has methods for updating fields on the Server.

16. JAVA Application Scheduler updates Arduino status in real time.
GUI for tables and fields.
Open / Close Switches.
Read switch status and sensors data.
Enable/Disable timer for open/close.
Set time to open and close.
Optional: Create graphs, show statistics.

17. Arduino Controller Flowchart
Setup
Server
Online?
Connect Timeout
MSG RCV
Yes No
Check Timeout
Close All
Handle MSG
High Temp?
Timer expired?
Open/ Close

18. Software UML: Arduino

19. Initialize System Start server using an opened port.
The Server will start a Socket on the selected port and wait for a new clients.
Power On the Arduino:
The Arduino will start a connection.
Connect to Wi-Fi.
Connect to the Server using Socket.
Repeat connections upon failure
When connected, Arduino sends name.
The server saves name and add to the List of Clients.
The Server sends timestamp to Arduino to setup the RTC Time.
Connection established, Arduino listens to incoming messages and performs commands.
After 90 seconds timeout (lost connection) Arduino switches to a self controller.

20. Initialize System Start Application:
The Application opens a socket on the selected port number.
Upon success, the Application registers as a client on the server.
The Application gets information, displays it to the user form the DB.
Send a command to the server and update the status information.

21. Tests Test manual turning on and off of switches.
Test Scheduled turning on and off of switches.
Test Failsafe in high Temperature or current according to sensors.
Test local functionality when communication is down.
Restart after power lost (server re-Init)
Sync with RTC.

22. Live Demonstration

23. Questions?