WIRELESS NOTICE BOARD USING MOBILE PHONE

ABSTRACT

The aim of this project is to built a prototype of a “wireless notice board” with LCD display using DTMF signaling. In this project we are using two mobile phones.We pass signals from first mobile to DTMF circuit through second mobile phone.The DTMF decoder circuit decodes the signals and sends the output to the microcontroller.Alphabets are not sent directly to the notice board (LCD) at receiver, but sent in the encoded form following an algorithm. This is because the keypad of mobile phone is numerical and DTMF decoded can only decode the number pressed at transmitting mobile in to its equivalent binary at the receiver.Alphabets are sent in an encoded form using numeric keypad to the receiver mobile and DTMF decoder as usually converts the numerical in to its binary equivalent.The decoded binary sequence is sent to the microcontroller which is pre programmed to decode the binary sequence in to respective alphabet and is sent to the LCD display.The LCD displays the encoded alphabet transmitted at the transmitted mobile. And hence the message to be displayed is printed on the LCD display.

Modules:

· Microcontroller

· Mobile phones

· Power supply

· DTMF circuit

· LCD display

Languages & softwares:

· Keil uVision

· Embedded C

· ISP flash programmer

CONTN............READ MORE>>>>>>>

authors:

P.SHOBHA (Btech RVR&JC COLLEGE OF ENGG.)

S.VENKATESH (Btech RVR&JC COLLEGE OF ENGG.)

T.RAGHURAM (Btech RVR&JC COLLEGE OF ENGG.)

M.KRISHNA KANTH(Btech RVR&JC COLLEGE OF ENGG.)

P.PRABHATH(Btech RVR&JC COLLEGE OF ENGG.)

I sincerely thank authors,the students of "RVR&JC COLLEGE OF ENGG"

for their great support.

my special thanks to v.v.m.m.rao

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