Sunday, February 24, 2008


Preliminary measurements on the Sharp IR distance measurement chip

I did a quick lashup for doing some rough measurements with the Shart IR distance measurement instrument I bought.

Here you can see the instrument itself to the left and above the prototype USB controller board. I slapped on a few extra screw terminals to handle the three lines off of the instrument.

I was able to get it to spot a piece of 3 mm HDPE feedstock at 500 mm away. This one has a range of about 1500 mm and a voltage range of 0-2.75v. Given that it costs right at $12.50, that's not bad performance at all. Sharp has another model which is focussed in to 300 mm. That might a nice one to mount on a Reprap to scan an ongoing print job.

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