Nexus-H7 FD. Fast grblHAL controller for professional SMT placement.

[Alex]

Nexus-H7 FD. High-Performance Motion Controller.

The Nexus-H7 FD is an advanced motion controller based on the STM32H723 (550 MHz), designed specifically for professional SMT placement machines (OpenPnP) and high-speed CNC systems running grblHAL.

 Key Features

* 0.8 MHz Step/Dir: Stable pulse generation on the X/Y axes.
* Dual Isolated CAN FD: Two independent buses for distributed control (X/Y Servo + Tower/Feeders).
* Isolated RS-485: Dedicated interface for smart feeders (Nexus-Feeder) via Modbus/Custom protocol. Industrial Grade: Full galvanic isolation of power drivers (UCC21520), CAN and RS-485 interfaces.

[Alex]

пятница, 3 апреля 2026 г. в 20:56:09 UTC+3, Alex:

[guo feng]

good job

[Alex]

Prepared the Nexus-Drive-FD board.

вторник, 14 апреля 2026 г. в 06:28:32 UTC+3, gfen...@gmail.com:

[Alex]

Added the Sense board to the project – an intelligent sensor hub.   https://github.com/AcaA-sys/Nexus-Sense-FD

суббота, 2 мая 2026 г. в 07:38:00 UTC+3, Alex:

[guo feng]

Hello, is this project currently open source? I haven't seen the stencil creation files. If possible, I'd like to create my own stencil for verification.

tks!

[Alex]

Hello ,

To clear things up: the Nexus hardware ecosystem is a custom development, and we do not provide ready-made fabrication Gerber or stencil files for replication.

Furthermore, using Step/Dir control (even at 0.8 MHz via grblHAL) completely defeats the purpose of the Nexus-H7 FD architecture for an SMT installer. Standard pulse/direction signals cannot leverage the industrial-grade dynamics required for professional pick-and-place performance.

The entire Nexus project is designed around a distributed architecture:

1. Master Controller (Nexus-H7 FD) offloads real-time physics and communicates via high-speed CAN FD.
2. Axis Control must be handled by intelligent FOC servo controllers (like Nexus-Drive-FD) combined with Sin/Cos encoders.
3. Peripheral Nodes (valves, vacuums, steppers) are managed via dedicated slave nodes like Nexus-Tower-G4 and Nexus-Sense-FD.

If you want to achieve professional-grade placement, you should look into the complete ecosystem rather than trying to adapt a single board for legacy Step/Dir servo drives. You can review the project topology and public documentation here: github.com/AcaA-sys.

Best regards,
Alex

среда, 20 мая 2026 г. в 06:54:37 UTC+3, gfen...@gmail.com:

[simpl...@tuta.io]

"Standard pulse/direction signals cannot leverage the industrial-grade dynamics required for professional pick-and-place performance"

I think that's nonsense.

The use of pulse train signals (Step/Dir) is still the gold standard on a great many industrial machines in the lower price range. My self-developed motion controllers (also closed source) deliver clock rates of several MHz across 18 axes simultaneously, although, of course, only 7-segment ramps are used for full jerk control. 

But I wouldn't dare to constantly promote untested, unfinished closed-source hardware or software in an open-source forum.

Best regards,
SM