How to wire / setup Neopixel on the Duet 2 Wifi?

TheBasedDoge

On the release notes for 3.3.0, I see the following support was added for the Duet 2 WiFi:

RGBW NeoPixels LED strips are supported
Bit-banged NeoPixel LED strips are supported on Duet WiFi/Ethernet. On these boards RRF will wait stop movement while updating the LED strip, so M150 commands should not be issued while the machine is printing, other than at places where a short pause is acceptable such as at layer change and in the start and end scripts.

What pins are used / how can I set this up on my Duet 2 WiFi boards? I did not see any further instruction for wiring anywhere on the wiki for the duet 2.

dc42

@thebaseddoge I have just added this section https://duet3d.dozuki.com/Wiki/Neopixel_and_DotStar_LEDs?revisionid=HEAD#Section_Connecting_NeoPixel_strips_to_Duet_2_Wifi_or_Ethernet.

TheBasedDoge

@dc42 Thanks, I see it now. i will try it out Is the limit 80 LEDs on the Duet 2? With external power?

dc42

@thebaseddoge said in How to wire / setup Neopixel on the Duet 2 Wifi?:

@dc42 Thanks, I see it now. i will try it out Is the limit 80 LEDs on the Duet 2? With external power?

The limit on Duet 2 is currently 60 RGB LEDs or 45 RGBW LEDs.

TheBasedDoge

@dc42 So i tried today to wire it up, but no luck. I use this level shifter: https://www.amazon.com/gp/product/B07LG646VS/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

is this incompatible?

alankilian

@thebaseddoge How did you wire up that level shifter?

TheBasedDoge

@alankilian

GND from pin 2 on CONN_LCD > GND on the level shifter > into the GND on the neopixel
Pin 5 on CONN LCD > LV3 on level shifter > DI on neopixel
5v from duet > into 5v on neopixel

alankilian

@thebaseddoge I think you have to run 3.3 Volts to the LV pin on the level shifter.

Also, connect the HV ground to the LV ground.

There's a schematic in the comments section at: https://www.amazon.com/gp/product/B07LG646VS/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

Also, people have said they couldn't get Neopixels running using this.

TheBasedDoge

@alankilian i went through the comments but I don't see a schematic

are you saying i need to put both 3.3v and pin 5 into the LV pin on the level shifter? because i currently have pin 5 > lv > hv> LEDs

The ground goes from the duet > ground on the level shifter > ground on the strip

alankilian

@thebaseddoge Here's a picture from your link showing how to connect 3.3 Volt, 5 Volts, Ground, your signal from the Duet and your signal to the LED string.

However, people in the comments say this device does not work with their LED strings, so you might not be able to get it working either.

dc42

A faster level shifter would be one quarter of a 74HCT08 quad gate. Connect both the inputs of the gate to the Duet output, and connect the gate output to the Neopixels. Power the 74HCT08 from +5V and ground. It's good practice to connect the unused inputs the other 3 gates to ground.

TheBasedDoge

@alankilian Yeah it didn't work. I will order the 74HCT08 and try again

tekstyle

@thebaseddoge
Can you Share the source of the sketch you used for your arduino?

A Former User

@tekstyle said in How to wire / setup Neopixel on the Duet 2 Wifi?:

@thebaseddoge
Can you Share the source of the sketch you used for your arduino?

I'm interested too!

A Former User

@dc42 said in How to wire / setup Neopixel on the Duet 2 Wifi?:

74HCT08

Just for confimation, you mean that I have to connect the AND input to the Duet and the related AND out to adafruit, right? It's not clear for me if an Arduino is needed or not....in case how to interface it with the Duet?

dc42

@thedragonlord you don't need the Arduino if you use firmware 3.3 and the level shifter. However, there is the limitation that on Duet 2 the print will be suspended for small fraction of a second whenever you use M150 to change the colours. So if you change the colours frequently while the machine is printing, then print quality could be affected.

A Former User

@dc42 said in How to wire / setup Neopixel on the Duet 2 Wifi?:

@thedragonlord you don't need the Arduino if you use firmware 3.3 and the level shifter. However, there is the limitation that on Duet 2 the print will be suspended for small fraction of a second whenever you use M150 to change the colours. So if you change the colours frequently while the machine is printing, then print quality could be affected.

Uh ok....well, for now I wanted to use the RGBW ring (not strip) just to make a sort of "progress bar" for the heating before printing...I was als thinking to use it during the print to make always a sort of progress bar for the printing process but I have to study the object browser to see what information are available...I was thinking to base the progress on the actual layer number/total layers number but I still don't know if and where those informations are available...in any case I'll change colors only once per layer group..My rgbw ring has 24 LEDs so any LED would represent the 4,17% of the whole...

dc42

@thedragonlord if you can arrange to change the colours while the filament is retracted, perhaps in a layer change script, then there should be no impact on print quality.

A Former User

@dc42 said in How to wire / setup Neopixel on the Duet 2 Wifi?:

@thedragonlord if you can arrange to change the colours while the filament is retracted, perhaps in a layer change script, then there should be no impact on print quality.

yes, that's exactly what I meant to do, thanks!

zapta

@dc42, is it OK to Have two 60 led stripes fed in parallel from the duet signal out? Or any other serial / parallel "tree"?