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add basic info to the README 

Hopefully it'll save others some time researching this.
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Ted Timmons 2018-06-22 15:14:04 -07:00 committed by GitHub
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# PRUSA Laser filament sensor # PRUSA Laser filament sensor
KiCad PCB layout
Filament presence and velocity detection using a [PAT9125EL optical laser movement sensor](http://www.pixart.com.tw/product_data.asp?product_id=173&productclassify_id=18&productclassify2_id=51&productclassify_name=Optical%20Tracking%20Sensors&productclassify2_name=Consumer&partnumber=PAT9125EL-TKIT%20PAT9125EL-TKMT), operating at 850nm.
See also:
* [PAT9125EL datasheet](http://www.pixart.com/upload/PAT9125EL_GDS_V1.2_31052017_20171011150843.pdf)
* [boucaron's investigation into this board](https://steemit.com/printing3d/@boucaron/prusa-mk3-filament-detector-short-study)
# KiCad PCB layout
![PCB](rev.02/laser-sensor.png) ![PCB](rev.02/laser-sensor.png)