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how to design a distance counter

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corabict

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Hey guys
I am new here that's my first post actually

i want ur help to design a counter that counts the distance the object moved ( a wheel ) in cm & millimeters that will pop up on a screen
i need to know the basic idea behind it & know if there is several ways to do so i'd like to know that

& i want to make it as small as possible ( very small actually )

thanks in advance
 

rotary encoder is the answer

54_1346128510.jpg

63_1346128510.png


http://electricly.com/incremental-optical-encoders-the-rotary-encoder/
http://www.robotplatform.com/knowledge/motion_control/feedback_control.html
 

Thanks very much for replying
encoders seem to be a very good solution to my problem

but one last question

in the concept in this image
**broken link removed**

**broken link removed**

is there is any possibility to make a counter in this small size ... .
is that possible manually or not
thanks again sir
 
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A very good encoder solution for your small size would be the AS5145H-HSST from Austria Microsystems.
It is a Magnetic Rotary Encoder; (Meaning all you need is a rotating 2-pole magnet); Resolution 0.0879deg; got 2 Digital Absolute Outputs; Serial/PWM & 3 Incremental Outputs and comes in a 16-Pin Shrink Small Outline Package.

You can find its datasheet on the manufacturer's website:
**broken link removed**
 

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