Question about H2 board versions and component compatibility

[Xanuman]

Hello, Maxim!
Thank you for this wonderful open source project!

There are two versions of the H2 guitar board:

1. Old, simplified from 2022.08.15
2. Newer from 2023.04.04

Questions:

• How important is it to use the new version? Are there any critical bug fixes?
• Have people already made the new version in hardware? Is it working?

I plan to install your H2 system on the CJ0618 machine
Already ordered:

• Stepper motor NEMA23 57hs112
• Driver DM556
• Optical encoder E6B2CWZ6C (1800 PR)

I have not made any mistakes, will these components work correctly with the H2 guitar?

[kachurovskiy]

Hi @Xanuman, thank you. Both versions of the board work well. I suggest to use the simpler, older version. Newer version of the board was created for CE/FCC compliance reasons.

⚠️ Due to Arduino relatively low frequency and realtime requirements (can't plan the motion ahead) H2 can only issue 2800 step impulses per second. This means that the motor can reach ~800 RPM at 200 steps per revolution or ~200 RPM at 800 steps per revolution. Make sure to use a motor with a driver that can do full steps or use the H4 controller instead.

So if you're going to proceed with the H2 build, make sure that your driver has 200 step mode. Some only support 800 steps and above.