Connecting a VFD to my shapeoko 4 board

Hello all,

I just did the jump and bought a Huanyang 1.5kw spindle. I feel pretty good about connecting everything except when it comes to the VFD to the gurbl board. I see where I can connect it (PWM & GND). Are there connectors that I need to purchase in order to connect these 2 wires? What is the easiest way? Hard to find pics on this. Any help will greatly be appreciated. Thanks.

Obligatory disclaimer: connecting a third-party VFD and spindle is not an officially supported mod (especially considering C3D is about to release a spindle & VFD kit of their own now), so consider the following as community knowledge, and proceed carefully to not fry your board.

That said: many have done this (myself included, on my SO3 at the time) and it’s not overly complicated but it does depend on how comfortable you are with a little soldering / connector crimping.

If you don’t have/use a BitRunner, the most convenient solution by far is to use the BitRunner connector and pick-up the PWM and GND there.

The pinout was described in that post (see the 6-pin connector on the left of the picture), and this thread has the connector housing and terminal crimp reference you would want to get

That’s pretty much all there is to it, you then have to make sure your VFD is configured for a 0-5V inputs, or buy a 5V/10V level shifter in case your VFD would only supports a 0-10V analog input for PWM.

Hopefully this gets you going. Double-check everything you are doing, the Shapeoko controller does not like having its 5V shorted to GND, blue smoke would follow.


Thanks for the reply @Julien. For now, I’m just going to connect it without pairing it up to the board. I’ll control it with the VFD till I read a bit more and get more comfortable. Bought it off of amazon all preconfigured. The only thing is, I just can’t get the VFD to display RPMs. Which I think would be more helpful for me. Does anyone know the secret?

I don’t know that particular VFD, but they usually use one of the front panel button to cycle between display modes (RPM/Amperage/Voltage/etc…). You should be able to dig up a user manual on the internet based on the VFD reference.

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