3 Simple Ways to
Share What You Make

With Instructables you can share what you make with the world — and tap into an ever-growing community of creative experts.

PhotosPhotos

Share one or more photos of a project, recipe, or whatever you've made, quickly and easily.

Step by StepStep-By-Step

Share your step-by-step photos with text instructions of what you made so others can do it too!

VideoVideo

Share your how-to video. You'll need your embed code from a video site such as YouTube.

Tachometer made from a bicycle speedometer (cyclocomputer)

Step 3Fire it up!

Fire it up!
As soon as your device starts spinning, the cyclocomputer should read the speed.
The big numbers are its speed in hundred of rpm. In the picture, it is spinning at 2810 RPM.

The best part about using a cyclocomputer is that it automatically records how much time the device has been spinning. In the picture, it has been running for 0 hours, 13 minutes, 21 seconds. This could be useful if you wanted to (for example) change the oil on an engine every 100 hours of operation.
The cyclocomputer also records maximum and average speeds, which could be useful in some situations.



Troubleshooting:
If no speed shows up, try moving the sensor closer to the magnet, and make sure that the cyclocomputer is set to display speed. If it still reads nothing, move a magnet back and forth past the sensor by hand. Numbers should appear. If they don't, the wire could be broken. They are pretty flimsy.

« Previous StepDownload PDFView All StepsNext Step »

Pro

Get More Out of Instructables

Already have an Account?

close

All Steps Viewing
View all steps of an Instructable on the same page when you're a Pro Member.

Upgrade to Pro today!
1
Followers
2
Author:josie