Bell Timer Circuit using AT89S52

Posted on Feb 7, 2014

The circuit is bell timer. This new project uses AT89S52 microcontroller and I2C EEPROM to store the alarm timings. Also the 7segment display is replaced with LCD display. DS1307 is used for Real time clock. The user can store upto 25 bell timings and they can even set the time delay for bell ringing in seconds. An 4G—3 keypad is used to enter t

Bell Timer Circuit using AT89S52
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he real time clock and the bell timings. ULN2003 is used to drive the relay for the bell. this circuit can used by alarm timer, school bell, etc. Here is a schematic drawing:

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