@infiniteloop said in Energizing a relay using the expansion header:

@Muhammed

Can I use the E1 heater output for coil pins?

That depends. The E1 heater output switches to GND, but provides VIN on the other pin by default. So return to the data sheet and assure that your relay’s version has a matching ”Coil code”: ”24” for a VIN of 12V, ”25” for a VIN of 24V.

A note of caution from the documentation:

There are no on-board flyback diodes on these outputs, so if you connect a high-current inductive load, you must use an external flyback diode.

I forgot for a second that the E1 heater output doesn't match the coil requirements for this relay, which operates at 5V. Are there any suitable pins on the board that I could use instead? If not, I'll need to consider using a different relay.

Thanks for the note as well.

@infiniteloop Yes, its a 400mW coil, sorry for not mentioning that.

I need to turn it on and off multiple times within a short period of time. Can I use the E1 heater output for coil pins?

Thanks

Hi,
I want to control an MT2 Relay that has this datasheet using the 50-pin expansion header on my Duet 2 board. The relay works fine when directly connected to a 3.3V output. However, when I try to control it using a heater output, such as exp.heater3 it does not get energized. Any ways to control it?

Thanks for your help.

@droftarts I really appreciate your support and thanks a lot . This solved the issue perfectly.

@Muhammed This is the current output while the above code is implemented during the printing process.! Is there anything I can do for improvements?

Hello everyone, Thank you all for your support up to this point. It seems that putting the slicer in relative extrusion mode is giving better results, and the code below is working just fine:

G1 E-5                       ;Retract the filament slightly
G4 S0.3                      ;Wait for 3 millisecond
G0 F5000 X20.0 Y117.5 Z40.0  ;Move to a reference starting point
G4 S0.1                      ;Wait for 1 millisecond
G1 F9000 X200                ; Move the X-axis to the endpoint
G1 E5

However, after this code executes, the printer’s head returns from the Z40 height to start the next layer, but during this, a bit of filament is melting from the nozzle and affecting the print. Is there any way to adjust this?

Thanks!

@oliof Thanks a lot for the valuable feedback, I will try that carefully and see how the printer will response.

@droftarts Thanks a lot, I had this in mind but wanted to see if there are other way to go around this. Using any output on the 50 pin expansion header would be fine, right?

@Phaedrux I understand now.

I don't have specific speed requirement for now, but definitely not 3mm/s. This was the recommended speed by Creality for this printer. Would it be ok for the printer if I increased it to 600?
Thank you all.

Hello!

I am wondering if it is possible to have some sort of communication or control of a USB camera through a Duet 2 board. Specifically, I need the camera to take photos at specific times. I believe I can initiate a specific output for that, but I haven't been able to figure out if there is a way to communicate with the camera to take photos automatically.

Its a nozzle camera just like this: https://www.aliexpress.com/item/4000182981338.html

Any input on this would be greatly appreciated. Thanks!