voltage level with 7 segment

Discussion in 'The Projects Forum' started by sangebaba, Dec 24, 2012.

  1. sangebaba

    Thread Starter New Member

    Dec 24, 2012
    i want to use 7 segment in voltage level indicator instead of LEDs so what should i have to do with the circuit(circuit is given below)
    i just want to show
    0 for voltage < 10.5
    1 for voltage > 10.5
    2 for voltage > 11.5
    3 for voltage > 12.5
    4 for voltage > 13.5
    and i want to use 0-24 volt DC supply instead of 12v lead battery so what would i do??
    thanks in advance!
  2. spinnaker

    AAC Fanatic!

    Oct 29, 2009
    With all logic / opamp chips that is going to be a challenge with more components than you have already. Consider looking at a micro controller like something out of the PIC line of chips. One mcu a couple of resistors and capacitors is really all you need.

    Then you could display any voltage you wanted over a wide range of voltages.

    You could add a couple of chips for BCD to seven segment to make it easier on yourself as far as coding and wiring but one chip (the mcu) is areally all that you need as long as you want to tackle the complexity of charlieplexing.
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  3. absf

    Senior Member

    Dec 29, 2010
    Have you done the truth tables as attached. After making the truth table, you can make a simple logic circuit using NAND gates like 4011 and a BCD to 7seg LED chip 4511 or 4543 to display your result on CC LED.

    And yes, the simplest solution is like what spinnaker says.....use a pic or avr. What about a PIC16F88.

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  4. ScottWang


    Aug 23, 2012
    Op Amp voltage detector → Voltage limit → 74HC147(Or 74HC148) → CD4511 → 7 Segment LED (0~9)
    Last edited: Dec 25, 2012
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