SMART SWITCH

LI Wai Kin 15022276D LAW Fu Shing 15052724D KWOK Sumarisa 15027576D

IntroductionSmart switch is a wifi remote controlled switch. This product can be the master

control of home electrical appliances. Users only need to install our app on their

smartphone and register the Smart Switch. Then, they can manage their electric

appliances in a convenient way.

Scenarios Before

● When you get up, you turn on your coffee making machine while you are busy in brushing your teeth, washing your face, making your hair style… until you realise you are already late for school or work

● When you go to sleep, you have to close switches to turn off electrical appliances. The moment you really get to sleep, you forgot if you turn off all of them.

ScenariosAfter

● When you get up, just one press, you can turn ON all your required electric appliances for the whole day.

● When you go sleep, just one press, you can turn OFF the electric appliances and go sleep immediately.

Scenarios Before

● You forget to turn off the battery charger while you are outside and there are no one the home. It makes you anxious.

Cannot focus on your own work.

ScenariosAfter

● Set a timer to turn off the charger or you just turn it off remotely outside your home.

Put your cares aside !

iOS App Design

First Try : Bluetooth Android Phone direct connect to arduino via bluetooth module HC-05.

PROS

● A router is not required.

CONS

● Frequently disconnected.

Second Try : WifiAndroid phone direct connect to arduino via wifi module ESP8266.

PROS

● A router is not required.

CONS

● Control one Smart Switch per time● It is bothering to control more than one Smart Switch since we have to disconnect from

the current Smart Switch and establish a new connection to the another Smart Switch then continue our control work.

● Internet service is currently not available since we have to disconnect from the home router and connect to ESP8266 network.

Third Try : Wifi & RouterAndroid app indirectly connect to the Smart Switch ( ESP8266 and switch circuit only ) via home router.

PROS

● Arduino is not involved.● ESP8266 is very small. The size of the product can be reduced.● Control multiple SmartSwitch per time is possible.● Internet service is available.

Working Principle

Problem Encountered● Not easy to connect ESP8266 to the home router. It is indicated in the router

log that the ESP8266 have tried so many time but few is successful established.

● Connection between home router and ESP8266 is not stable.

● A large amount of heat is generated from the ESP8266 when successful

connected to the home server.

● Relay has limited load current

Fourth Try : Wifi & RouterAndroid app indirectly connect to the Smart Switch ( Raspberry Pi 2 and switch circuit ) via home router.

PROS

● Stable connection● Fast and Easy development with Linux OS

CONS

● High price● Large in Size

Working PrincipleRaspberry Pi 2

Switch Circuit Implementation

GPIO0 ( ESP8266 )

GND ( ESP8266 )

Relay

This connect to load

Final Product within Limited Time

END