Bluetooth controlled devices using Arduino microcontroller. how to simply control your home appliances by using arduino . It's pretty simple due to open source platform of Arduino and its IDE.

1. Overview
1. What is IOT?
2. How to get Started.
3. What is Arduino?
4. What is its used for?

2. IOT
Internet Of Things is interconnection of various Digital Devices which
enables them to share data , with least required human-human or human-
computer interaction.
The vast network of devices connected to the Internet, including smart
phones and tablets and almost anything with a sensor on it – cars, machines
in production plants, jet engines, oil drills, wearable devices, and more.
These “things” collect and exchange data.

4. What is Arduino?
• Arduino is a open source hardware and software platform. In 2005 Massimo
Banzi of Italy created it.
• These are AVR based microcontrollers.
• Various Arduino boards are UNO, Nano, Lilypad, MEGA, MEGA ADK etc.

5. Why Arduino?
• IT is open Source, both in terms of hardware and
software.
• It is cheap, and can be made by using purchased
components.
• It can communicate via serial communication by USB
• Powered even from PC.

6. Arduino IDE
• Figure showing a basic
program of Arduino IDE

7. Atmega 328
•Microcontroller ATmega328
•Operating Voltage (logic level): 5 V
•Input Voltage (recommended): 7-12 V
•Input Voltage (limits): 6-20 V
•Digital I/O Pins : 14 (of which 6 provide PWM output)
•Analog Input Pins: 8
•DC Current per I/O Pin: 40 mA
•Flash Memory 32 KB (ATmega328) of which 2 KB used by bootloader
•SRAM: 2 KB (ATmega328)
•EEPROM: 1 KB (ATmega328)
•Clock Speed: 16 MHz

8. About Project
• Project is own an application of IOT.
• Title:- Bluetooth controlled devices using Arduino.
• Components Used:-
1. Arduino Nano, Bluetooth HC-05
2. Relays, ULN 2003
3. 220V light bulbs as AC load.

9. Circuit diagram

10. What is relay?
• Relay is kind of an electric lever , it switches ON with a tiny current but
switches ON(leaverages) other devices with a large current.

11. Why to use relay?
• For relay only machine interaction is is required in circuit.
• Circuit powering the coil is completely separate from the circuit switched
ON by the relay.
• For low power controlling circuit to control high power controlled circuit
relays are used.
• In this circuit 220V AC load is there so 12V relays are used.

12. What is ULN 2003?
What is this used for?
• ULN is an array of 7 NPN darlington transistor ,capable of 50 mA’s of
current and upto 50 V of output.
• ULN acts as an invertor.
• It also acts as an voltage driver between relay
And Arduino

13. Bluetooth module HC-05
• Default baud rate is 9600. But it supports upto 1382400 upto requirement of
high speed transmission
• Works at Frequency of 2.5 GHz
• Auto pairing code is 0000 by default but you can change it as your wish.

14. Android App used
• App is built on Appinventor by MIT. Bulding Block Are shown in figure

15. App

16. Program working
• Program is written in file works as:
1. Setting the output pins D2,D3 as 2, 3 respectively
2. Setting baud rate of Serial Communication 9600.
3. Checking if Serial Data is Available.
4. Table of App Working.
Light no. ON OFF
Light 1 Sends character ‘a’ Sends character ‘b’
Light 2 Sends character ‘c’ Sends character ‘d’

17. Applications of Project
• DIY Projects. Like RFID based.
• Can be used for physically disabled persons.
• Applications where short circuit may happen if touched the supply.
• Wireless Serial Communication.
• Home Automation.
• Can be used for various sound enabled devices.

18. Disadvantages
• Only work for limited range or short distance path
• Number of appliances which can be controlled
through it are limited.
• Circuit complexity increases as the number if
connected devices are increased.
• Don’t play stupid with your house electricity.

19. Future Scope of IOT
• Smart homes.
• Smart farms.
• Smart cities. Jalandhar one of the Upcoming smart cities.
• Smart industry.
• Our smartphones are brilliant examples of IOT.

20. Thank You for your attention
• ANY QUERIES.Post in comments