pyVCP button to control generic digital out

oddwick
Topic Author
Offline
Premium Member

5 years 9 months ago #196150 by oddwick

pyVCP button to control generic digital out was created by oddwick

Just curious if this is even possible. I have searched the forum and to be honest i am not really sure what to search for. what i am trying to do is create a pyvcp button to toggle a digital output. specifically with a mesa 7i96 using one of the general outputs to turn on and off an extraction fan. i can do it using an M code, but i would really like to do it with a button and toggle if possible. any ideas?

Please Log in to join the conversation.

tommylight
Away
Administrator

5 years 9 months ago #196160 by tommylight

Replied by tommylight on topic pyVCP button to control generic digital out

It should be,
www.anderswallin.net/tag/pyvcp/
linuxcnc.org/docs/2.8/html/gui/pyvcp.html
First link, second example should do what you need, or checkbutton on the second link, but the latter is very small.

Please Log in to join the conversation.

Todd Zuercher
Offline
Platinum Member

5 years 9 months ago #196177 by Todd Zuercher

Replied by Todd Zuercher on topic pyVCP button to control generic digital out

Yes it very much is possible. It's even possible to have both a custom m-code and a vcp button. In fact it can make it easier. If you set up an m-code, you can trigger it with a halui mdi command with the vcp button.

Without the M-code you have to use either a hal toggle component, or a toggle button in your vcp.

Please Log in to join the conversation.

oddwick
Topic Author
Offline
Premium Member

5 years 9 months ago #196265 by oddwick

Replied by oddwick on topic pyVCP button to control generic digital out

hey thanks tommy, i got that far, i have some buttons that turn on the pump and flood, and that works pretty well. and that example is pretty much what i had going, but where i got lost there seems to be no attributes that i can set for motion.digital-out-NN. like with mist, there is halui.mist.on/halui.mist.off etc. that i can manipulate. how do i do that with digital-out?

Todd Zuercher wrote: Without the M-code you have to use either a hal toggle component, or a toggle button in your vcp.

is it better to use the m-code? that is what i use (o subs anyway) to do generic canned operations like parking head, probe touch off. but how would i actually toggle it or would the m code toggle it when its called? if i used a mdi command, can it process logic or access machine variables?

Please Log in to join the conversation.

chris@cnc
Offline
Platinum Member

5 years 9 months ago #196270 by chris@cnc

Replied by chris@cnc on topic pyVCP button to control generic digital out

Hi,
not sure what do you want do with motion but i think you want enter some straight postion or switch on or off somthing.
I do also some off this and here my exmaple.
First button is for touching tool. I use a old style dial indicator and touch always 100mm top of the surface.
Second is for laser switch on and after find X and Y i set position. In my case not zero mounted.
And "Parkpositon" is drive to front or rearside.

Attachment not found

Warning: Spoiler!

Please Log in to join the conversation.

Todd Zuercher
Offline
Platinum Member

5 years 9 months ago #196275 by Todd Zuercher

Replied by Todd Zuercher on topic pyVCP button to control generic digital out

A custom M-code can be pretty much any executable file, but is usually a Bash or Python script. In it's simplest form it may be just a bash script that executes a halrun command to setp the value of a hal input pin. The hal pin will then hold that value until it is changed by something else. (You have to remember though, you can't setp a hal input pin if it is already connected to an output.)

What might be the best approach will depend on the complexity of what you're trying to accomplish.

Unfortunately custom m-codes can't contain g-code, so o-sub logic and machine parameter variables aren't available. But you can do that by remapping an m-code.

Please Log in to join the conversation.

rodw
Offline
Platinum Member

5 years 9 months ago #196278 by rodw

Replied by rodw on topic pyVCP button to control generic digital out

Its not often done, but it is possible to maintain a separate pin inside your screen handler that is set by a screen control or by analog or digital input. Its a long time since I've done it but it does work.

Please Log in to join the conversation.

oddwick
Topic Author
Offline
Premium Member

5 years 8 months ago #197926 by oddwick

Replied by oddwick on topic pyVCP button to control generic digital out

so for what i am trying to do, that is a bit of overkill. basically i just need to hit button on screen and toggle one of the digital outputs on a 7i96. i would think that it would have been simpler than that. i can do it with the mist and flood, but i have two more that need to do the same thing to...

Now, when you say m code can be any executable, that really peaks my interest for other things. BUT, (there's always a but) you say that one cant pass machine parameters to it unless you remap it. could you elaborate?

Please Log in to join the conversation.

rodw
Offline
Platinum Member

5 years 8 months ago #197950 by rodw

Replied by rodw on topic pyVCP button to control generic digital out

This very old example with help from islander261 is extracted from a python screen handler file for Gmocappy
In this case an analog input is connected to a pin called command-from-file in the handler
Different numeric ranges sent by M67/M68 override the screen controls
So in your case you could connect the screen button to your fan and set it from gcode as well...

Warning: Spoiler!

Code:

#ISLANDER - input for control codes from gcode file (M67 E0 & M68 E0)
        self.command_from_file = hal_glib.GPin(halcomp.newpin("command-from-file", hal.HAL_FLOAT, hal.HAL_IN))
        self.lock_height = hal_glib.GPin(halcomp.newpin("lock-height-from-file", hal.HAL_BIT, hal.HAL_OUT))
        self.halcomp["lock-height-from-file"] = False
        
        #ISLANDER - service command from gcode
        self.command_from_file.connect("value-changed", self.on_new_command_from_file)
        self.hal_btn_THC = self.builder.get_object("hal-btn-THC")




   #ISLANDER - this function is used to decode command from gcode file
   # if real time control of height hold is desired then 1X and 2X need to be
   # decoded in a realtime component
    def on_new_command_from_file(self, hal_pin, data = None):
        if hal_pin.get() != 0:
             command = hal_pin.get()
             #THC run from file
             if 20 <= command < 30:
                    self.halcomp["lock-height-from-file"] = False
                    #no need to decode I% here no Hypertherm RS-485
             # height hold from file
             elif 10 <= command < 20:
                    self.halcomp["lock-height-from-file"] = True
                    #no need to decode I% here no Hypertherm RS-485     
             #global THC on
             elif 900 == command:
                   #self.hal_btn_THC.set_active(True)
                   self.halcomp["hal-btn-THC"] = True
             # global THC off
             elif 999 == command:
                   #self.hal_btn_THC.set_active(False)
                   self.halcomp["hal-btn-THC"] = False
              #get arc voltage
             elif 360 <= command < 400 or 3060 <= command < 3201:
                   if command >= 3060:
                        command = command - 3000
                   else:
                        command = command - 300
                   self.halcomp["target-voltage"] = command
                   self.lbl_prog_volt.set_label("%d" % command)
             #get preset Amps not actually used
             elif 410 <= command < 500 or 4000 <= command < 4201:
                   if command >= 4000:
                        command = command - 4000
                   else:
                        command = command - 400
                   #nothing else to do here for now
             #get arc servo delay time
             elif 50 <= command < 60 or 500 <= command < 600:
                   if command >= 500:
                        command = (command - 500)
                   else:
                        command = command - 50
                   self.adj_THC_delay.set_value(command)
             #get THC tune
             elif 710 <= command < 720:
                   command = command - 710
                  #nothing to set yet  
             elif 80 <= command < 90 or 800 <= command < 900:
                   if command >= 800:
                        command = (command - 800)
                   else:
                        command = command - 80
                   self.adj_pierce_delay.set_value(command)

Please Log in to join the conversation.

andypugh
Offline
Administrator

5 years 8 months ago #198105 by andypugh

Replied by andypugh on topic pyVCP button to control generic digital out

If you just want to link an onscreen button to a physical IO pin it is just a case of making the control in a PyVCP panel and (in HAL) connecting the pyvcp pin to the io pin.

It would be as simple as

net this-pin pyvcp.button -> hm2_7i96.0.gpio.000.out

Or similar.

Please Log in to join the conversation.

Time to create page: 0.192 seconds