Sensor for linear measuring

Thread Starter


Joined Jul 5, 2013
Hi all,

I'm studying to design a linear measuring tool like a digital calliper.
I've been considering optical encoder from Avago technology but current consumption is up to tens of mA which is not suited to my design using a battery cell.

My expectation for sensor is as follow:
-Average current consumption is 3 mA or less.
-Price: less than $10 USD.
-Resolution: 0.25 mm or less.
-Measuring range: 20 cm or more.

Hope someone give me some suggestions. Thanks.


Joined Dec 13, 2013
most mfgrs of digital calipers and micrometers use optical encoders, so there must be some out there somewhere.