Rpm to km hr

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Rpm to km hr

All rights reserved. Use of this site indicates your consent to the Terms of Use. Remember Me? By logging into your account, you agree to our Terms of Use and Privacy Policy , and to the use of cookies as described therein. Mark Forums Read. Vendor Directory. Whether it's got an acronym or not, here's where you'll find discussions on all sorts of tools, toys and gadgets. Thread Tools. Hi, I practice on a stationary spinning type bike. I recently bought a computer to monitor rpm. But the description was wrong and it only shows kph or mph, not rpm. I have read a lot about conversions and i even unerstand the maths, but the results dont make sense to me. The radius of the front spinning wheel is 23 cms so i set the circunference to mm 3,14 pi x 2 x 23 cm x I have read about setting to so i get rpm directly, but when I pedal i still get about 30 kph. How can i set the computer to show rpm or how can i convert, say, 30 kph to rpm?

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This is more like a physics question or maybe I don't know this part in my project. The problem is that I'm getting wrong readings with the below logic. Please refer to the attached diagram and excerpt from my sketch and suggest me if I'm making any physics calculative mistakes. Posting it inline as you have done makes it much harder to read or copy and paste for diagnosis. It's still not too late to edit your post and do this. You'll make potential helpers much happier.

Enter a value to the speed field above, in order to see the results in this table. Cancel Print. Number of digits: 10 x notation for big numbers:. Minas E. Lemonis, PhD - Updated: March 27, More in this page: Characteristic speeds Multi-conversion table Relationships between units of speed.

Rpm to km hr

You can also use it as an RPM to mph calculator. The first section explains the RPM definition and its extensive use in the automotive industry. In the second part, you will see how engine RPM relates to vehicle speed, and understand the effects of drivetrain transmission and tire size.

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I have same problems with you. And I can't see anything directly wrong. The problem is in the code you didn't show. Refbacks are Off. Telling us what computer you own would help. I have read a lot about conversions and i even unerstand the maths, but the results dont make sense to me. Oh, and just how 'wrong' are your readings? I can't help either No matter how much I take the interval - 1 second or half sec or quater second, the final results are in multiples of Forgot your password? Random Post Every 5 Minutes D.

Speed is the rate of change in position of an object, regardless of direction of travel. Velocity is speed in the context of direction. Conversions are performed by using a conversion factor.

Log in. Use noInterrupts to temporarily disable all interrupts while you get a copy of the volatile variables. My electric bike has a similar system for odometer and speedometer, and the location of the magnet and sensor makes no difference, for the reason I just outlined. Ask a question, start a discussion or post something for sale! Looking for some help I'm now using IR opto coupler and observe same results when using the hall effect sensor, but without interrupts. Remember Me? Liked 16 Times in 13 Posts. Last edited: Sep 17, May 13, 7, 1, 1, The Mines. You are right that cnt count is a multiplier in the final result, but even if I make cnt as float, the values of cnt will never be between two integers, as here I'm only using one pair of magnet and hall sensor, which essentially means 1 count per revolution, so I have to increment cnt by 1 every time.