01-02-2011, 12:25 AM
WORKING EXPLANATION
The plete circuit diagram of automatic bus station announcement system is discussed in this article.
Transmitter:
the code of each bus is transmitted from the bus by the transmitter circuit. ncoder IC HT12E is used to generate the code of the bus number. The encoder chip HT 12D has the 8 bit address and 4 bit data lines. any code for a bus can be sent to this. each corporation is separated from one another by the code used. the transmitter will activated in a pulsating form. astable multivibrator wired around IC 555 is used for this purpose.
Message section:
The voice chip APR600 is used to play the voice message. PR 9600 offers true single chip voiced recording. There is facility for the non-volatile and playback for about one minute. 4 different messages are recorded on the chip. A micro controller is also used for controlling the recording and playback.
[attachment=8564]
The plete circuit diagram of automatic bus station announcement system is discussed in this article.
Transmitter:
the code of each bus is transmitted from the bus by the transmitter circuit. ncoder IC HT12E is used to generate the code of the bus number. The encoder chip HT 12D has the 8 bit address and 4 bit data lines. any code for a bus can be sent to this. each corporation is separated from one another by the code used. the transmitter will activated in a pulsating form. astable multivibrator wired around IC 555 is used for this purpose.
Message section:
The voice chip APR600 is used to play the voice message. PR 9600 offers true single chip voiced recording. There is facility for the non-volatile and playback for about one minute. 4 different messages are recorded on the chip. A micro controller is also used for controlling the recording and playback.
[attachment=8564]
