Duet Buddy - a proof of concept remote monitor

zapta

I use this tune to let me know when the printer is in pause mode (e.g. to insert magnets half way). My serial duet monitor detects the state from the PanelDue communication and plays it every few seconds.

Should be easily to do the same with the M4Stack since it knows the printer's state and has a 1W speaker.

(I tried to play tunes via gcode but barely hear them from the PanelDue's speaker).

zapta

Had more progress with the firmware and it's stable and usefulnow. Here is a video that demonstrates how it behaves with the sequence: print, pause, resume, pause, cancel.

https://imgur.com/UKi2MdF

The full source code is here https://github.com/zapta/misc/tree/master/duet3d_buddy/arduino and is in public domain so feel to do with it whatever you like. The main flow is straight forward Arduino style and should be easy to understand and modify.

If any programmer here is looking for ideas on how to improve it, here are a few:

Some mechanism that will allow people to buy the M5Stack and program it by inserting a SD card with downloaded software.
UI to select from a few duet related mini apps (e.g. a Pressure Advance Buddy that allow to increase/decrease pressure advance on the fly using a + and - buttons)
Sound effects. E.g. a periodic tune when in pause mode to get the attention of the operator.

tobias_munich

@zapta is it working with the DUET3 & RRF3?

zapta

@tobias_munich said in Duet Buddy - a proof of concept remote monitor:

@zapta is it working with the DUET3 & RRF3?

Didn't tested it with duet3 and RRF3 (I have neither) but it it doesn't work, a small change should fix it.

The duet buddy polls the printer at the URL below with xx.xx.xx.xx representing the IP address of the printer.

http://xx.xx.xx.xx/rr_status?type=3

It expect to get back a json document with the printer status and then extract a few values such as progress, temp and z height. You can try it manually from a browser and see if you get a json doc. If you will post it here, I can text if the existing firmware will parse it correctly.

richardmckenna

@zapta not sure about standalone mode duet3 but I don't think it will work with duet3 + pi as DSF has a new REST API so it would be a GET at http://{{RASP_PI_IP}}/machine/status.

Also not sure if the JSON model that is returned has changed from the old version. I will see what it returns tonight if no one else has by the time I get to it

zapta

@richardmckenna, shouldn't be too difficult to handle the difference. The duet buddy reads its configuration from an SD card so instead of the duet IP it can read the full duet status URL. As for json field names, if they changed, should be difficult to select an alternative parsing.

This is the current duet status parser logic. It's straight forward and can be easily adapted to pick whatever fields.

https://github.com/zapta/misc/blob/master/duet3d_buddy/arduino/duet_parser.cpp

Danal

@zapta said in Duet Buddy - a proof of concept remote monitor:

@tobias_munich said in Duet Buddy - a proof of concept remote monitor:

@zapta is it working with the DUET3 & RRF3?

Didn't tested it with duet3 and RRF3 (I have neither) but it it doesn't work, a small change should fix it.

The duet buddy polls the printer at the URL below with xx.xx.xx.xx representing the IP address of the printer.

http://xx.xx.xx.xx/rr_status?type=3

It expect to get back a json document with the printer status and then extract a few values such as progress, temp and z height. You can try it manually from a browser and see if you get a json doc. If you will post it here, I can text if the existing firmware will parse it correctly.

If you look at DWC2, it contains a javascript module that figures out whether the printer is using HTTP Polling or using WebSockets, connects, and then handles future requests in an abstract way. Shouldn't be too hard to reproduce this in the M5stack device. That would allow it to connect to either old or new very easily.

zapta

@Danal, that makes sense. I already change the format of the configuration to allow specification of full url. The determination of the protocol can be added as an automatic logic or a user configured flag. This platform is very flexible.

https://github.com/zapta/misc/blob/master/duet3d_buddy/arduino/arduino.ino#L9

Edit: the 'type=3' in the URL has nothing to do with RRF3.

tobias_munich

@richardmckenna @zapta
this is the output from the standalone version.

{"status":"I","coords":{"axesHomed":[1,1,1],"wpl":1,"xyz":[15.000,0.000,4.850],"machine":[15.000,0.000,4.850],"extr":[0.0]},"speeds":{"requested":0.0,"top":0.0},"currentTool":-1,"params":{"atxPower":-1,"fanPercent":[0,100],"speedFactor":100.0,"extrFactors":[100.0],"babystep":0.000},"seq":1,"sensors":{"probeValue":0,"fanRPM":[-1,-1]},"temps":{"bed":{"current":24.2,"active":0.0,"standby":0.0,"state":0,"heater":0},"current":[24.2,23.4],"state":[0,0],"tools":{"active":[[0.0]],"standby":[[0.0]]},"extra":[{"name":"*MCU-Temp","temp":48.0},{"name":"*Chamber Temp","temp":28.3},{"name":"*Chamber Hum[%]","temp":28.3}]},"time":149.0,"currentLayer":0,"currentLayerTime":0.0,"extrRaw":[0.0],"fractionPrinted":0.0,"filePosition":0,"firstLayerDuration":0.0,"firstLayerHeight":0.00,"printDuration":0.0,"warmUpDuration":0.0,"timesLeft":{"file":0.0,"filament":0.0,"layer":0.0}}

Danal

If you don't need to full two way interface... There is a way to get status (only) from a Duet3/RRF3 with HTTP only (no socket needed). Here is a Python example that returns a JSON object of "Current Position" from either 2 or 3 via auto-detection:

# Python Script to return JSON object of current position from a Duet printer
# Auto-detects RRF2 vs RRF3 protocol
#
# Copyright (C) 2020 Danal Estes all rights reserved.
# Released under The MIT License. Full text available via https://opensource.org/licenses/MIT
#

import requests
import json
import sys

endpoint2='/rr_status?type=1'   # RRF2 request
endpoint3='/machine/status'     # RRF3 request
endpointA=endpoint2             # Active

def getCoords(base_url):
    global endpointA
    if (endpointA == endpoint2):
        try:
            r = requests.get(f'{base_url}{endpointA}')
            j=json.loads(r.text)
            jc=j['coords']['xyz']
            ret=json.loads('{}')
            for i in range(0,len(jc)):
                ret[ 'xyz'[i] ] = jc[i]
            return(ret)
        except:
            endpointA = endpoint3
    if (endpointA == endpoint3):
        try:
            r = requests.get(f'{base_url}{endpointA}')
            j=json.loads(r.text)
            ja=j['result']['move']['axes']
            jd=j['result']['move']['drives']
            ad=json.loads('{}')
            for i in range(0,len(ja)):
                ad[ ja[i]['letter'] ] = ja[i]['drives'][0]
            ret=json.loads('{}')
            for i in range(0,len(ja)):
                ret[ ja[i]['letter'] ] = jd[i]['position']
            return(ret)
        except:
            print(base_url," does not appear to be a RRF2 or RRF3 printer", file=sys.stderr)
            raise


# Test cases
print(getCoords('http://192.168.7.100'))
print(getCoords('http://127.0.0.1'))
print(getCoords('http://192.168.7.101'))

And example output:

{'x': 0.0, 'y': 0.0, 'z': 626.751}
{'X': 271.4, 'Y': 341.1, 'Z': 5.7, 'U': 0}
{'X': 271.4, 'Y': 341.1, 'Z': 5.7, 'U': 0}

zapta

Thanks Danal. I am currently using '/rr_status?type=3' but this can be configured in the M5Stack SD card config file to any url. Picked =3 because this is what my DWC keeps polling.

Currently the response parser looks for these json fields:
status, fractionPrinted, coords.xyz[2], temps.current[0] and temps.current[1]. If RRF3 has them then it work with no change. Otherwise, adding them to the parser should be easy.

Response parser is straight forward and anybody make changes for RRF3 please send me a pull request.

https://github.com/zapta/misc/blob/master/duet3d_buddy/arduino/duet_parser.cpp

bricor

@zapta I just set one up. Fairly straight forward, Monitoring a print job as I'm typing this. I may have missed it, is there a way to program the buttons to pause or stop the current job or does it only monitor the printer (one way device)? Thank you, it's a neat little device.

zapta

@bricor, awesome!!!

Currently the buttons are not used but shouldn't be too difficult for any with some programming experience to program them to do things, for example, sending gcode commands to the printer.

Here is a challenge, the first person that will program a button to send any command to the duet will the respect of the community and an amazon gift card of $25 (e.g. for a spool of filament). Challenge closes April 30. Please report your success here and ping me.

bricor

@zapta I really apprecite the effort. I could only imagine what it took to put this together. For me, it was a challenge to put the bits and pieces in place to go from plugging in the usb cable to having a functioning device. Not difficult, but a challenge. I hope to figure out what you did here and the whole c programming stuff. Need to be able to toggle between machines (ip addresses) as well

zapta

@bricor, I plan to look for ways to simplify the deployment for people that don't want to deal with Arduino. M5Stack has a software tool called M5Burner and another option is to use the esptool program directly. Need to figure those out or possibly somebody here can come with a simple recipe to 'burn' the Duet Buddy firmware.

bricor

@zapta I should’ve said fun challenge. Rewarding type

richardmckenna

dammit!!! you guys have just made, nay, forced me to buy this!. Grrrrrr

M5Stack and Battery module on their way.

tekkydave

I have one on order from Bangood. Ordered the Grey one at £29.53 as it has the motion sensor built in.

jay_s_uk

I ordered the grey one too from aliexpress for £28.51.
Still waiting for it to get dispatched due to the "extended" chinese new year.
Sounds as though that won't happen till around the 18/02

richardmckenna

@tekkydave ah I went with this one https://www.amazon.co.uk/MakerHawk-Development-Bluetooth-Expandable-Compatible/dp/B07M71ZG6N which has the built in MPU9250 - £13 more but I get it tomorrow