Music call with the ability to change melodies without using a programmer

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Schemes of radio-electronic and electrical devices

Music call with the ability to change melodies without using a programmer. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Microcontrollers

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Feature of the device

Possibility for the user to create ringtones and record them into a call using a special program that runs in the Windows 9x environment. It does not require a programmer or programming knowledge.

Functionality

Supported ringtone formats
(number of melodies x maximum number of notes in a melody):
32 m x 7 n. 4 m x 63 n.
16 m x 15 n. 2 m x 127 n.
8 m x 31 n. 1 m x 255 n.
Random selection of ringtones.
The memory of a call that did not open the door.

Electrical specifications

Supply voltage	3,0 to 5,5 V.
Standby current	no more than 27 μA.
Current consumed in melody playback mode	no more than 250 mA.

Schematic diagram of a call

(click to enlarge)

Wiring diagram for bell button and sensor

Music call with the ability to change melodies without using a programmer. Wiring diagram for bell button and sensor

Cable diagram for connecting a bell to a computer

Music call with the ability to change melodies without using a programmer. Cable diagram for connecting a bell to a computer

Diagram and PCB of the bell in P-CAD 2000 format (ACCEL EDA) can be downloaded here.

Call operation description

The call is based on the PIC12C508 microcontroller. Ringtones are stored in an electrically programmable memory chip with an I2C bus type 24C04. All signals necessary to control the operation of the call and read / write melodies are output to one XP1 connector. Either a bell button and a sensor, or a cable for communication with a computer are connected to this connector. The sensor is used to determine the opening of the door by a bell and consists of a reed switch (fixed part) and a magnet (mounted on the door itself).

When you press the call button, a randomly selected melody is played. If within 3 minutes the door is not opened, then its subsequent opening will cause the melody to play. In other words, if a melody starts to sound when the door is opened, it means that someone rang the doorbell when no one was at home.

To create melodies and record them into a bell, a program for a personal computer has been developed - "Melody Editor" that works in the Windows 9x environment. If it is necessary to record new melodies, the call is connected via a cable to the LPT port of the computer.

You can download "Melody editor" (52 KB) here (It requires the Mfc42.dll library to work).
To record melodies in a call, you must:

Connect the bell using a cable to the LPT port of a personal computer. In this case, the computer must first be turned off.
Turn on the computer, load Windows and launch the "Melody Editor" program.
Record ringtones.
Shut down Windows, turn off the computer.
Disconnect the call from the computer.

Author: Burov Mikhail, burov@kosnet.ru; Publication: cxem.net

See other articles Section Microcontrollers.

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