1. Voice Controlled Robot by Cell Phone with Android App
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2. contents Project overview Block diagram Microcontroller 8051
Motor Driver IC
Android app and Bluetooth device
Schematic & Working of the project
Advantages
Applications
Future scope
Conclusion

3. Project overview
The robot is controlled by a remote android application using voice commands.
Remote operation is achieved by any smart- phone/Tablet etc., with Android OS, upon a GUI (Graphical User Interface) based touch screen operation.

4. Block diagram
Transmitter:

5. Microcontroller It is a smaller computer
Has on-chip RAM, ROM, I/O ports...
RAM
ROM
I/O Port
Timer
Serial COM Port
Microcontroller
CPU
A single chip

6. Features of MC 8052
8K Bytes of In-System Programmable (ISP) Flash Memory
4.0V to 5.5V Operating Range
Fully Static Operation: 0 Hz to 33 MHz
256 x 8-bit Internal RAM
32 Programmable I/O Lines
Three 16-bit Timer/Counters
Eight Interrupt Sources
Full Duplex UART Serial Channel

7. Block diagram of mc CPU On-chip RAM On-chip ROM for program code
4 I/O Ports
Timer 0
Serial Port
OSC
Interrupt Control
External interrupts
Timer 1
Timer/Counter
Bus Control
TxD RxD
P0 P1 P2 P3
Address/Data
Counter Inputs

8. Pin out of 8052

9. What is called Android..?
Android is an open-source operating system which means that any manufacturer can use it in their phones free of charge.
It was built to be truly open. For example, an application can call upon any of the phone’s core functionality such as making calls, sending text messages, or using the camera. 

10. …….contd
Android is built on the open Linux Kernel. Furthermore, it utilizes a custom virtual machine that was designed to optimize memory and hardware resources in a mobile environment.

11. What is an android application on mobile phones?
An android app is meant for phones with an android based operating systems. They can be downloaded from the android app Market which is pre-loaded on every android phone.
Blue control APP and Bluetooth Spp APP are some examples.

12. Android-The world's most powerful mobile platform
Very customizable. Open source operating system is easily changed, hacked, manipulated, and molded to fit whatever functionality you had in mind. Found on all platforms for all prices depending on what hardware and software version you are interested in. The battery is usually replaceable.

13. COMPARISION OF ANDROID WITH OTHER OS
ANDROID OS : Android is open source software, manufacturers can modify the operating system to suit their respective needs and phones. This becomes a cheap and feasible alternative for the manufacturer, as opposed to developing an operating system in-house or hiring a software company to do it.

14. i-OS:
It's not available on all carriers but this is expanding. The battery is not replaceable which is why all the I Phone users you know have it plugged in all the time as the battery degrades.

15. Windows Phone:
Windows Phone is a closed-sourced, which means that it is solely developed by the company and protected by copyright. The Windows Store is limited as there only a few number of apps

17. ANDROID APPLICATION OPERATED BLUETOOTH
The Android platform includes support for the Bluetooth network stack, which allows a device to wirelessly exchange data with other Bluetooth devices.
The application framework provides access to the Bluetooth functionality through the Android Bluetooth APIs.

18. An example of Android App Blue-control Screen

19. FEATURES OF BLUETOOTH
Super simple and easy way to interface using Bluetooth stack.
3.3V Device with standard 5V DC Power source.
Can also support SPI Protocol, pins are made available.
Low power consumption, Low cost.
Has high-performance wireless transceiver system
Can be used to interface with PC, Mac or Android phones/tablets.

20. Generic Default Visibility at Software side:HC- 06 or Linvor
Default Pairing code is not '0000' but '1234'.
Please use Baud Rate with 8-N-1 connectivity from other device.
Works with any microcontroller with Serial connectivity.

21. Power on Reset circuit +5V + 10 uF 31 EA/VPP X1 30 pF 19 11.0592 MHz
8.2 K
10 uF +
MHz
EA/VPP X1 X2
RST 31 19 18 9

22. MOTOR driver l293d
L293D is a dual H-bridge motor driver integrated circuit (IC).
Motor drivers act as current amplifiers since they take a low-current control signal and provide a higher-current signal.
This higher current signal is used to drive the motors.
L293D contains two inbuilt H-bridge driver circuits. In its common mode of operation, two DC motors can be driven simultaneously, both in forward and reverse direction.

23. Operation of motor driver
L293D has 2 set of arrangements where one set has input 1, input 2, output 1 and output 2 and other set has input 3, input 4, output 3 and output 4, according to block diagram if pin no 2 & 7 are high then pin no 3 & 6 are also high.
If enable 1 and pin number 2 are high leaving pin number 7 as low then the motor rotates in forward direction.
If enable 2 and pin number 10 are high leaving pin number 15 as low then the motor rotates in forward direction.

24. Contd..
If enable 1 and pin number 2 are low leaving pin number 7 as high then the motor rotates in reverse direction.
If enable 2 and pin number 15 are high leaving pin number 10 as low then the motor rotates in forward direction.

25. THANK YOU