cellphone controlled 220v ac switching

1. Advanced Switching
CELLPHONE CONTROLLED 220V AC SWITCH
BY: ADITYA KUMAR

2. Introduction:
1) Cellphone controlled switch is a machine that can be controlled with a
mobile.
2) In the course of a call, if any button is pressed, a tone (DTMF) corresponding to
the button pressed is heard at the other end of the call.
3) The device perceives this DTMF tone with the help of the phone stacked on it.
4) The received tone is processed by the microcontroller with the help of DTMF
decoder.
5) The microcontroller then transmits the signal to the BJT to operate the RELAY &
our AC supply is ON/OFF.

3. Project Overview:
1)The device is controlled remotely using two cellphone one is stacked
on device and another one is used as remote.
2) Main circuit consist of many electronic chips that are:
a) Microcontroller ATMEGA16
b) MT8870
c) IC 7805
d) IC74LS04
e) NPN Q2N22

4. a) MT8870 is used here to receive the DTMF tone and generate
corresponding 4 digit binary code.
b) 74LS04(NOT Gate IC) is used for Quality resolution of the signal recived at
DTMF decoder.
c) Microcontroller ATMEGA16 is programed to take binary input and give
corresponding output.
d) This output works as input for npn Q2N22(BJT) that is made to work as
switching device.
e)Output of BJT is given to relay that is operated with 5V dc providing 220V
AC switching.

5. Basic Block diagram of device

6. Atmega16 & MT8870 IC’s:

7. Elements used:
(resistors,capacitor,bjt,crystal oscillator,relay)

8. Block Diagram Of Circuit

10. Working of switch:
1) In order to control the switch, you have to make a call to the
cellphone attached to the device.(which is in auto answering mode).
2) Now when you press 2 bulb1 will be ON (as programmed).
3) When you press 4 bulb 2 will be ON(as programmed).
4) Now when you press 6 bulb1 will be OFF (as programmed).
5) When you press 8 bulb 2 will be OFF (as programmed).
6) When you press 5 all supply will be OFF.

11. Programming
behind the
operation:

12. Software
Used:
1) Atmel studio 6.1
(for hex coding)
2) Flash tool
(for program writing)
3) Proteus 8 professional
(for circuit design)

13. Application:
1) Home appliances control.
2) Control of home windows and shutters.
3) Home entertainment system.
4) Security system.
5) Many other connectivity purposes.

14. Advantages:
1) Simple and easy to access.
2) Access from remote area.
3) Low power consumption.
4) Taking measures to reduce electricity bill.
5) Portability.
6) Cost efficient.

15. Future
Enhancement:
1) It can be used as :
a) Controlling speed of fan
b) Controlling room temperature
c) Recording our favorite TV
program when we are outside
from our home.
2) It can be used for security
proposes.
3) For many other connectivity
purposes.

16. Conclusion:
1) This document presents a mobile controlled and user friendly
approach towards better connectivity.
2) This system can be easily implemented because of its wireless
communication standards.
3) Many of the remote controlled application can be esily done
using this technique.