Embedded 1 to 8 intercom system

This project was created by M.Shakeel Malik. System allows to make regular calls and to one of 8 internal phones.

intercom.png

 

System is controlled by Atmel AT89S51 microcontroller. System also have its own tone generator which allowing to send dial and busy tones. Calls can be hold with voice message or melody signal transmission. Circuit and source asm code is available.

[..Source link..]

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