display and serial interfacing of


Posted on Feb 5, 2014

This hardware is used to display the number of cars in the parking lot. Basically, this board has six-segment display but using only one display can do our work. It used segment driver IC SN7447AN and 3*8 decoder to select the corresponding display. This unit is to display the number of cars in parking lot on the computer. The computer may be plac


display and serial interfacing of
Click here to download the full size of the above Circuit.

ed in any control room. Serial cable is used in null modem mode. We use the DB9 connector for serial interfacing. In null modem mode pin 7, 8 and pin 6, 4 are shorted with each other. While pin 3 is used for transmit data and pin 2 for reception. Computer and the micro-controller are connected to each other by serial port through ICL232 (IC 1), the only purpose of which is to convert the voltage levels to the compatible values. ICL232 needs to be used because the TTL and RS-232 voltage levels are different. In TTL, +5V and 0V are considered as high and low respectively, whereas for RS-232 these are 3V and +3V.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    280 Watt MOSFET Power Amplifier
    Simple Sixteen Stage Bi-Directional LED Sequencer
    Electric strike with Arduino circuitry
    and filter 1 3 5w power rf amplifier
    iButton Electronic Lock Schematic Diagram
    Voltage follower with 1G ohm input resistances
    Simple Alarm System
    FM Receiver Circuit
    The General Electric XT-1-A AM transmitter
    1490 Digital Compass
    Wien Bridge Oscillator Design



    Top