OpenGalvo - OPAL FW

[DanielO]

OpenGalvo OPAL Firmware is now in the open and making progress!

Purpose with the project is to build a controller that can control SLS type machines. This is the first step and covers the galvo only.

I use a Teensy 4.0 (4.1 on the way ) to send signals to a Digital galvo which takes XY2-100 protocol.
In my setup a SN75174N (https://www.ti.com/store/ti/en/p/product/?p=SN75174N) is used as a line driver to convert Teensy 3.3v signals to the differential input the galvo needs. The Galvo used is a SG7110.

Source Available at: github.com/opengalvo/OPAL

Two videos are made to demo function and speed.
Function: https://youtu.be/uMT-sZhYKJo
Speed: https://youtu.be/m6PLiacBdws

A Picture of the setup:

 

[DanielO]

The FW has not yet reached v0.1...
Functionallity:
- Galvo control (X/Y) over XY2-100
- Laser ON/OFF
- Laser PWM (Scale 0 to 4095)
- Laser SSR Relay controlled by FW
- G0 With X and Y codes (feedrate is ignores and laser is immediatly sent to position without feedrate control
- G1 codes with X,Y, F(Feedrate), S (Laser power)

Bugs:
- Fixed! Currently a memmoryleak prevents running more than 2800 (ish) GCodes before controller crashes...
- Serial input is sensitive and not compliant - Lines not formatted as expected might crash the controller.

Not yet implemented:
- "hold" if laser requires warmup
- Stepper motor for Z-Axis
- Teensy 4.1 not tested - but will be soon
- M-Codes are NOT handled.
- G0 doing laser auto Off is not configurable.
- Support for Step/Dir input was intended but might not be possible.
- No "Laser off if crash" functionallity, Possible fire hazard!

 

[th0o]

Hi, Daniel! Thank you for a great job! I'm very glad to see it. I want to continue and improve your previous experiense into open controller for 3d lpbf printer. Please, connect with me: burmmaxim@gmail.com