Transfer from: http: //www.csksoft.net/blog/post/280.html
Author: CSK
I do a direct result of this idea is to find a pattern of laser projection keyboard head Taobao, and very cheap. At that time just doing a 3D scanner, and intends way to do a play. Because there is actually a similar principle. With the experience to do laser ranging, complete this keyboard is very easy (in fact I only spent two days one night to complete all sections).
Performance:
Accuracy: +/- 1mm and the deviation of the actual value
Resolution: 0.1mm
Refresh Rate: 30Hz
Cost: ~ ¥ 100
effect:
Coming to write here, these will have to be content article describes. And people who know me will know that the article will be long :-) (written too tired). While I'd love to be able to share some of my experience to everyone, but also hate those directly copied profit. So when in the article and the code will do some processing, if only to copy from, will not be available, but to ensure that all expression is true, truly practice and understanding of the article can imitate the same or better performance works :-)
Stay tuned
Reproduced in: https: //my.oschina.net/dake/blog/196626