Using a optical coder

[nedtron]

Greetings,

Scott Shumate of Shumatech http://www.shumatech.com has designed a 3 axis Digital ReadOut for lathes and mills based on a single PIC microcontroller.

Full documentation is available on his web site and he sells bare circuit boards at very reasonable prices.

The Shumatech DRO has advanced features such as bolt hole patterns, tool offsets and RPM.

The Shumatech DRO will work with Chinese linear scales and / or rotary encoders simultaneously.

I bought the circuit board from Shumatech and built my 3 axis DRO for about $125 in parts which is a tremendous savings when comparable DROs cost $1,200+.

My Shumatech DRO:

http://users.rcn.com/seiths/projects...s/RPM_DRO.html

http://users.rcn.com/seiths/projects...s/RPM_DRO.html

I had started designing a PIC based DRO for my milling machine when I discovered the Shumatech DRO.

I abandoned the design, as it didn't make sense for me to attempt to reinvent a DRO when an excellent advanced featured DRO was available for the cost of a circuit board and parts.

Ned

[debutpic]

Hello everyone

Currently I have one quadrature optical coder and my code works fine (increase and reduction according to the sense of rotation)

I have two questions

1) I want to increase the resolution (x4) of the optical codeur while decoding the fronts high and low of two channels A and B (see the picture in blue)

2) When I start the code if I decrease immediately the value displayed is 65535 65534.9 65534.8 etc....
but I will want -0.1 -0.2 -0.3 etc

Do you have an idea to begin?