design digital speedmeter circuit

Thread Starter


Joined 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.


Joined 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.