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
Click here to download the full size of the above Circuit.

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:




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    High Impedance Voltmeter LM358
    RF isolation amplifier
    Peak-program-detector
    5 And 12V Ac Powered Switching Supply
    Schematic Diagram DCF77 Preamplifier circuit and explanation
    1998 DeVille: front power windows work ok left front window switch
    Homemade Digital CALL-ID English Version
    0-30V Lab Variable Power Supply



    Top