Limit&Home at one pin

Green#
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02 Nov 2014 05:24 - 02 Nov 2014 05:25 #52679 by Green#

Replied by Green# on topic Limit&Home at one pin

Feel free to make things for fun, but tried and tested commercial alternatives exist

maybe my PCB will be a commercial solution in the future

Last edit: 02 Nov 2014 05:25 by Green#.

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andypugh
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02 Nov 2014 05:33 #52680 by andypugh

Replied by andypugh on topic Limit&Home at one pin

Green# wrote:
maybe my PCB will be a commercial solution in the future

Quite possibly, though have you considered how you get the THC RS232 data into HAL for LinuxCNC to use?
The Mesa board uses an existing encoder counter HAL module, and the encoder velocity is interpreted as the arc voltage.
If you want to get serial data into HAL it would probably need to be from a Userspace driver (which might work well, but might not)

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Green#
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02 Nov 2014 05:54 #52681 by Green#

Replied by Green# on topic Limit&Home at one pin

THC and RS232 data I got prototyped now. I use example of MP1000A configuration, there is python module which can read data from RS and it works well, only a slight modifications I had to make. So my board can read THC voltage, compare it with real plasma Voltage, sending real voltage via RS to LinuxCNC and making automatic correction by compare linuxcnc parameter with the real value. The problem was limit and home because I need to build it at one LPT but thanks to you I got solution, because its a gantry machine I use one pin for home and limit of the axis x,y,z and the second pin for home and limit of axis A (second Y drive).

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