design digital speedmeter circuit

Discussion in 'The Projects Forum' started by praveenpp, Aug 6, 2010.

  1. praveenpp

    Thread Starter New Member

    Aug 6, 2010
    hi everyone,

    i am electronics student. i need to design circuit for digital speedometer. max of two 7 segment display can use. pls anybody help me.
  2. tom66

    Senior Member

    May 9, 2009
    What have you done so far?

    How are you even measuring speed? If this is for installation in a car, then you can use a tachometer to measure wheel speed and calculate road speed from the wheel's diameter.

    Or, you could use a GPS module. GPS modules are low cost (here I can buy one for about £20), and they give a relative speed output if they have a good enough signal. It would then be trivial to display this on the displays.