Keep Asking
Satisfying curiosity one question at a time. Send questions to: keepasking@howstuffworks.com.

Category RSS Feed

How do digital speedometers work?

by |

 

You asked:
How do digital speedometers work? — Eric, Burke Va.

Marshall Answered:
Not so long ago, the speedometer and odometer in your car were mechanical devices. But most cars today have a digital dashboard. This means that computer is displaying information on the dash using either digital displays or electronic dials. The basic idea behind a digital speedometer is to somehow sense how fast the wheels are spinning, massage that data with a computer and then display it on the dash. There are many ways to get the information about wheel spin rates. There could be a magnet or optical sensor on the drive shaft, or something like an anti-lock braking sensor might provide the data. For more info see: How Dashboard Displays Work

 
 

Comment Now

Recent Postings by Category