I am interested in the project speedometer and odometer done using pic 18f877a. But I have a doubt.Velocity is given as (RPM (Diameter*pi))/60. After that its written Velocity = RPM* radius of wheel*0.37699.How the value 0.37699 is obtained. If (2*3.14)/60=0.104.Then how the value 0.37699
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Aswinth Raj
Joined August 16, 2016 1000Tuesday at 12:29 AM
Hi Boney,
Yes your calculation is correct ,,....
(2*3.14)/60=0.104.
Actually is it 0.10471975512 to be more accurate.
But, this value is for m/s. since the rpm is also in rps and diameter of wheel is given in meters.
Speed is normally given in terms of km/hr. So we convert 0.10471975512m/s to km/h we will get the value 0.3769911184319698
which is used in the program.
Hope this helps you!!
Thanks