Digital speedometer using Arduino

Hi, Could anyone suggest a working circuit and code for making a digital speedometer using an arduino uno board for a car using a hall effect sensor or reed sensor using a magnet or any other sensor.

@ bobdxcool
some links
http://hackaday.com/2012/04/05/digital-speedometer-with-an-arduino/
http://www.treehugger.com/gadgets/build-your-own-arduino-bike-speedometer.html

@ bobdxcool
some links
http://hackaday.com/2012/04/05/digital-speedometer-with-an-arduino/
http://www.treehugger.com/gadgets/build-your-own-arduino-bike-speedometer.html

majoka

Thanks,but will the bike speedo work out for a an actual car??

@ bobdxcool
it would be clear answer after a experiment