CNC style Pendant

dc42

Yesterday I got my Pendant, exactly as the one pictured. I could start working on the implementation on my spare time

I'm still waiting for mine, but feel free to try my code. It's at https://github.com/Duet3D/CNC-Pendant-Firmware.

arhi

Serial.write("M112 ;" "\xF0" "\x0F" "\n");

any special reason for 0xF00F between M112 and 0x0A ? I see it comes after ; so it's a comment but ?

dc42

It's a special emergency stop code recognised by the input buffer code on the Duet, so that the emergency stop command bypasses the command buffers.

arhi

@dc42 great, good to know

arhi

@dc42

      int distance = encoder.getChange() * distanceMultiplier;
      if (axis >= 0 && distance != 0)
      {
        whenLastCommandSent = now;
        Serial.write("G91 G0 ");
        Serial.print(distance);
        Serial.write('\n');
      }

seems to me axis is missing from the G0 ?

dc42

That's because I failed to complete a recent change. Change the line:

Serial.write("G91 G0 ");

to:

Serial.write(MoveCommands[axis]);

arhi

@dc42 do you think it's better for wireless pendant to telnet to the RRF and send G-codes or to exec g-codes trough http://rrf/rr_gcode ?

gtj0

@arhi said in CNC style Pendant:

@dc42 do you think it's better for wireless pendant to telnet to the RRF and send G-codes or to exec g-codes trough http://rrf/rr_gcode ?

If you use http, you can use the pendant with either a Duet in standalone mode or via the DSF (with a slight change to the URL).

arhi

@gtj0 that's the reason I'm asking. HTTP approach looks better but dunno if there are penalties. I went forward last night and since I need a "send g-code" function in one place only it's not a big deal to have few different ones (one for telnet, one for http, one for - whatever...) as it will not be affecting the code.

I took a 2stick module from some broken game controller, that gives me 2 buttons + 4 axes with limited speed control (2k2 pots on the axes are not very precise, I can safely detect 2 speeds, maybe 3 especially as I added 4k7 in series so the swing is even lower, I might remove the 4k7 but 4x2k2 in parallel on the 3v3 rail is 6mA constant drain on the battery), attached to ESP32+BMS.

Telnet works for now but I'm still thinking if I need to add more buttons and leds.

Danal

Somewhere in all the above I ordered a pendant a few weeks back. JUST after I ordered it, Dave published his code. Which is great, not having to write it... so I haven't done much since then.

I have received the pendant now.

I'm thinking about an ESP32 (massive, massive, overkill, but they are $5 each...!) setup to do Serial or Network, including RRF2 or RRF3 printers. And just experimenting to see if it "feels" right when hooked up by various methods.

And a battery and an "off the shelf" USB charger/manager for the battery.

Going back and forth on having a small display, XYZ.

IMG_0502 (1).jpeg IMG_0503 (1).jpeg

gtj0

@Danal Lock picking for fun and profit??

Danal

Ooops... need to move that.

You nailed the goal. That is my practice set, they get progressively harder. Keep the 'ol fingers skilled up.

gtj0

@Danal The LockPickingLawyer is my hero.

FelixH

Arduino Nano to Duet PanelDue connector connections:

Nano    Duet
+5V     +5V
GND     GND
TX1/D0  Through 5K6 resistor to URXD, also connect 10L resistor between URXD and GND
*/

I don't have any 5K6 resistor at home, and I don't feel like driving 75 km to get one. Is there any way to make this connection possible? My 2 ideas are:

Using a 3.3 to 5 v logic converter
Using a 3.3v board to drive the pendant (I have some overkill ESP32 on stock)

Also, I'm guessing that 10L means to be 10K, right?

dc42

Yes 10L should be 10K. You need 2 resistors with a resistance ratio of 2:1 or a little less. For example, 10K and 18K. Or 6K8 and 10K. Or, if you have lots of 10K resistors, 5K (i.e. 2 of them in parallel) and 10K. Even 10K and 10K will probably work. The idea is to reduce the 5V output from the UART on the Arduino Nano to somewhere between 2.5V and 3.3V.

The sheet that came with the pendant says it needs a 5V supply for the rotary encoder. Maybe it will work on 3.3V, maybe not.

chrishamm

@gtj0 mine too!

I made my CNC pendant sketch available on a new branch of the same repository, AFAIR that worked quite well with an AtMega8. It may need some more customization though.

arhi

@FelixH said in CNC style Pendant:

Is there any way to make this connection possible?

Most of atmega's can work on 3v3 so instead of powering nano from 5V, power it from 3v3 and USART levels should be ok.

dc42

@arhi said in CNC style Pendant:

Most of atmega's can work on 3v3 so instead of powering nano from 5V, power it from 3v3 and USART levels should be ok.

Yes, if the encoder in the CNC pendant will work on 3.3V. Or alternatively, if it has open-drain or open-collector outputs so that t can be powered from 5V without feeding 5V to the A and B outputs.

FelixH

@dc42 said in CNC style Pendant:

The idea is to reduce the 5V output from the UART on the Arduino Nano to somewhere between 2.5V and 3.3V.

So I could also use a logic converter there, right?. I have a bunch of "3.3 to 5 Bidirectional Bus" mini boards

arhi

@dc42 never tried but IIRC from the DS atmega is 5 V tolerant when running from 3 V so powering encoder with 5V and Atmega with 3V should be safe. The major possible problem is if it will run properly on 16 MHz on 3V (iirc 4.5 minimum for 10+ MHz) but I never had issue myself, they always worked ok.

@FelixH as you mentioned logic level converter, if you have one that would for sure work safest