Posts made by ZipZap

@chimaeragh

Tbh i dont see any isolation on this board aside the "isolation of load and control area" via the relay itself.
You have some flyback diodes on the control side but thats it. the black thingys are just transistors. You could put some 3V3 on the VCC pin, but that has to be at least 500mA or so because it is used to drive the coil of the relay. DO NOT try to drive this board with the IO-pins itself, the current draw is too high.

If you want real opto-isolation (which is preferable), you should use a board like this one:

Keep you eyes open for the bulky black boxes with two terminals on each side. Those are the optocouplers.

Greetings from sunny germany,
Julien

@droftarts

This is just awesome!
The current of the pins should pose no real problem, since the inputs of the relayboards are conneted via isolators - i just need to check, if 3V3 is sufficient.

I will give an update, when i did the wiring.

/Julien

Sorry for the late reply.

@droftarts

Yes, i only need IOs for relays, so no PWM.
The documentation said that every other pin (for ex. endstops) are just inputs? If they could be configured as outputs, than its easy game.

Would you be so kind to point out which pins can be used as outputs (for relays) and how to configure them? That would be a huge help.

/Julien

@droftarts
Well, thats too bad (for now).
So I2C-expander it is, for the next project.

Thanks for the useful information.

/Julien

My dearest co-printers, i have a (maybe simple) question:

Which pins on a Duet 2 WiFi expansion-header can be used for GIPO-pins?
Of course its the remaining five heaters (no probs there). I need up to 8 additional pins for controlling relays. Is it possible to use the EN-pins of the unused extruders?

If yes, please help me with the definition of the following. How do i clear and redefine an extruder pin correctly?

M950 P8 C"^exp.e5_en"										; printstate red

Many thanks in advance and greetings from stormy gemany,
Julien

I don't think its ringing either.
Can you measure the pitch of the waves? If it matches the pitch of your belt, then this is a possible cause.
I had a similar issue, until i switched to genuine GATES-belts. Chinese belts seem to always be a little off regarding the profile of the teeth.

/Julien

@techni

Hmm...
I think 0.4mm (total tolerance) per meter is pretty good for a plate of about 5-8mm thickness. Adding up to this comes the tension in the plate due to heating up bottom to top and the tension due to thermal expansion while being fixed on standoffs. Depending on your standoff-positioning you could deform the bed if you use more than 3 screws. There is also the deformation due to its own weight...

Did you contact clever3D and ask for a thicker plate? For everything over 300mm per side i think the plate must be ticker than the usual 8mm - should be more like 10-12mm.
Have you measured your bed with a BL-Touch for example? How is the heightmap looking?

/Julien

@techni

Feel free to contact Clever3D.
They are from germany (my homeland) and specialize in Heatbeds. They could also arrange a suitable heating mat if desired.

/Julien

Bummer.
I have another circuit (@Egon-Net for the big fan), which should have a ripple around 30mV.
It shows me a ripple of 28V... i think my oscilloscope is not working right.

I have a replacement in delivery, so i should be able to make all my desired measurements around the weekend. Sorry for the delay.

/Julien

@egon-net

Still testing, should be ready tomorrow or wednesday.

@resam

It shouldn't be a big deal to saw the hole out.
There are no traces within this.

/Julien

Meine Platine ist angekommen, sieht wirklich ordentlich aus.

/Julien

@sphyloid

4K7 between ADVREF and thermistor input and the thermistor between thermistor input and VSSA. The thermistor IS the resistor on the thermistor side.
Your schematic seems correct.

/Julien

@alankilian

According to the documentation the fuse should be intact, because all other temps are working properly.

Why could it read open circuit?

Stupid me has had a connection issue, where i had the sensor between, VSSA and VAREV and the pullup between VSSA and input7...

Everything is working fine now, thanks a bunch alan!

@alankilian

Done.
Thermistor reads now -273,15° as if not connected, but the pin seems to work.
Does the other end go to VSSA, or GND?

Works, i should have scrolled to the bottom... i also added the R4700 value to the command.

The thermistor reads about 2000°C, fluctuating to 19xx and 45xx occasionally.
Is there a wiring issue?
The thermistor works fine, when connected to the e0 or e1 input on the board.

Hey guys, quick question:

In RRF3, how do i declare at thermistor input on the expansion header?
The thermistor is on VSSA and the other end on the THERMISTOR7-pin and has a pullup of 4K7 to 3V3 as dc42 suggested (in older threads).

M308 S7 A"Chamber" P"e7temp" Y"thermistor" T100000 B3950	;set thermistor for heated chamber 

Any helpt on how to declare would be appreciated.

/Julien

@egon-net

Sounds all swell to me.
I'm still in on beta-testing, i would like an assembled board (because of a missing hotair-gun...).
For the final version, i would like eight (8) non-assembled kits.

@zemlin
I use simple automotive antifreeze too. The materials in the circuit are aluminum, stainless steel and plastic. The ratio of additive to destilled water is about 1/10.
I have no problems with oxidation or organic growth for the last 6 months.

/Julien