Unable to resolve coolant momentary switch issue

I'm new to LinuxCNC and I'm having difficulty getting the following setup to work.
I'd like the coolant to turn on or off using either the Axis checkbox or an external momentary switch.

What's the best way?

There are halui pins for controlling coolant (flood and mist). They are separate three separate pins for both, on, off, and a status pin. You can use some hal logic to control them using a single momentary input,.

I've been troubleshooting the below code without success. When the momentary switch is pressed, the coolant is turned on, but unable to turn off again. Any suggestions on how to rectify?

I'm not sure that the Toggle2NIST component is the right tool for the job. (at least by it's self.) Toggle2NIST holds it's output pins true between button presses. What might be a better option is to just use a couple of and2 comps, a not, and maybe a oneshot (or edge).

The idea being a button press and the coolant on pin true, sends a pulse to the coolant off pin, and Similarly a button press and a coolant-on-not pin true would send a pulse to the coolant on pin.

When ever I try, this sort of hal logic, it always seems to end up much more complicated than it appears at first glance on the surface.

Todd Zuercher wrote: When ever I try, this sort of hal logic, it always seems to end up much more complicated than it appears at first glance on the surface.

Thats why I think that making a custom component is often so much easier. What you can do in 2-3 lines in C can take half a page in hal.

This is probably LinuxCNC's best kept secret.

Easy peasy, if your fluent in C. I'm not, so I just muddle along stringing together hal commands.

I've written some similar logic in Lua for a previous Mach4 build, so the logic and code should be somewhat similar in C. What's the process for creating and compiling a custom C component? Alternatively, does anyone have some hal logic they could share to achieve the required result?

IIOII wrote: I've written some similar logic in Lua for a previous Mach4 build, so the logic and code should be somewhat similar in C. What's the process for creating and compiling a custom C component? Alternatively, does anyone have some hal logic they could share to achieve the required result?

If you drop in on the plasma and laser section on this forum, there are several components I've written. Use them as an example.
This is a simple one. forum.linuxcnc.org/plasma-laser/32657-th...-indicator-component
Then its just as simple as typing "halcompile --install mycomponent.comp"
And the component is compiled and installed for you.

Just remember your component is being called every time the servo loop is called. Don't do any loops, just wait until the next pass through.

This will work with the toggle2nist, it just needs to be connected right and maybe an edge, added.

IIOII wrote: What's the process for creating and compiling a custom C component?

linuxcnc.org/docs/2.7/html/hal/comp.html

For fun you could use LUT5, with inputs from the button, halui.coolant.is-on and the iocontrol coolant pins.
LUT5 is especially good fun when you feed its own output back as an input. But it does tend to make for rather "write once" HAL code.