Get Output Pin States for Conditional GCode

webdes03

I have relays connected to "out8" and "out9" on my Duet 3, for the purpose of powering a mister and vacuum.

;Set up vacuum and misting outputs
M950 P2 C"out8" ; define P2 as vacuum
M950 P3 C"out9" ; define P3 as mister

Everything works correctly, and I added M7/9/10/11.gfiles to enable those functions):

# M7.g
M42 P3 S1	; enable mister
G4 P2000	; wait for 2 seconds

# M9.g
M42 P3 S0	; disable mister
G4 P2000	; wait for 2 seconds

Now, I'm trying to create macros to toggle the mister and vacuum on and off, but I can't figure out how to read the outputs to determine if they're on or not so I can do the appropriate action of the toggle (turn it on of it's off, or off if it's on).

Presumably I can do something like the following, I just can't seem to master the right solution to make it work:

# ToggleMister.g
if P3 EQ 0
  M7
else
  M9

SpoonUnit

The current value of the pin will be in the object model under sensors probably. Explore the object model using the console in DWC using

M409 F"v" K"sensors"

I think you'll find your pin values under

M409 F"v" K"sensors.inputs"

e.g.

M409 F"v" K"sensors.inputs[1].value"

Once you've nailed it. You can then use echo to test the value and trigger the tool to test changes

echo sensors.inputs[1].value

Now you're in position to use the conditional GCODE. Following what you have above, this might look like this

if sensors.inputs[1].value
    M7
else
    M9

webdes03

Hmmm... let me poke around. I only see inputs, not outputs... but maybe it's staring me in the face and it's just not "clicking".

webdes03

And by "I only see inputs", I mean endstops...

{
    "key": "sensors",
    "flags": "v",
    "result": {
        "analog": [],
        "endstops": [
            {
                "triggered": false,
                "type": "inputPin"
            },
            {
                "triggered": false,
                "type": "inputPin"
            },
            {
                "triggered": false,
                "type": "inputPin"
            },
            {
                "triggered": false,
                "type": "inputPin"
            }
        ],
        "filamentMonitors": [],
        "inputs": [],
        "probes": [
            {
                "calibrationTemperature": 25.0,
                "deployedByUser": false,
                "disablesHeaters": false,
                "diveHeight": 5.0,
                "maxProbeCount": 1,
                "offsets": [
                    0,
                    0
                ],
                "recoveryTime": 0,
                "speed": 2.0,
                "temperatureCoefficient": 0,
                "threshold": 500,
                "tolerance": 0.030,
                "travelSpeed": 100.0,
                "triggerHeight": 0.700,
                "type": 0,
                "value": [
                    1000
                ]
            }
        ]
    }
}

webdes03

Just in case the full dump helps diagnose anything:

I am running RC7 if that makes a difference.

M409.json

T3P3Tony

Just confirmed with @dc42 that output pin States are not yet in the Object Model however there are plans to add them.

dc42

I've just added output pin states to the OM, so it will be in the next release.

webdes03

Ahh awesome, thanks guys!