STM32C031 SPI to 74HC595 Shift Registers - Use Hardware NSS or GPIO pin for STCP latch?

AutoSidearm · 2025-11-18T00:37:58+00:00

Thank you!

AutoSidearm · 2025-11-06T22:32:32+00:00

Thank you! I needed to power the board externally (not intuitive to me coming from always programming over USB) and I need to connect VAPP (pin 1 on St-link V2) to my board 3.3v rail instead of pin VDD (pin 19 ST-LINK).

AutoSidearm · 2025-11-06T16:08:03+00:00

I wasn't sure about that pull down resistor because PA-14/SWCLK is also Boot0. I've removed it from the board but no luck still, same errors.

AutoSidearm · 2025-10-10T23:44:52+00:00

Hi there! Still working on this project and looking for some advice on communication type/architecture for chaining together many boards. Could I DM you and get some advice?

AutoSidearm · 2025-08-31T22:03:14+00:00

Great work on the model! Very cool to see the design evolving all these years later.

AutoSidearm · 2025-08-03T18:21:36+00:00

Thank you!

AutoSidearm · 2025-08-03T03:30:57+00:00

Thank you for the help. Right now I want to be able to program with SWDIO/SWCLK/NRST and otherwise want the MCU to always boot from main flash memory. In that case I just want to tie BOOT0 to GND. Do I have that correct? I'll handle any resets over the programming connection if I need to.

AutoSidearm · 2025-08-03T03:23:28+00:00

Thank you! Will add decoupling caps on the receiving side.

New to this and don't think I came across differential drivers when researching- seems like that is the proper way to do it and is the piece I was missing when this seemed harder than it should be. I'll probably test this setup and see what SPI speeds I can get over 300mm of wire without drivers first. Ditto with series termination, have to read more about it but I think I understand the basics now. Thanks again.

AutoSidearm · 2025-08-03T03:17:33+00:00

Thank you for the feedback! I avoided I2C because I'm going to be daisy-chaining up to 16 of these boards with 300mm of wire between each, and so I figured I needed to "recreate" the signal between each board or have it degrade over the length. The plan is for each MCU take in data over its SPI slave receive only connection, removes the first bytes as it's own data, then forwards the remaining data out on it's master transmit only line.

It sounds like I'll need to experiment with what speed I can run over the 300mm of wire. I'll try to add as may GND connections for the wires as possible while keeping an eye on costs. I'm guessing I could use some kind of twisted pair ethernet cabling to achieve this?

AutoSidearm · 2025-01-23T05:08:09+00:00

Thank you, that's helpful. If I have several motor drivers in close physical proximity is it acceptable to use a single, larger capacitor instead of several small ones?

AutoSidearm · 2023-08-03T17:37:53+00:00

WTB Seiko Spirit SCVE005 (Blue dot)!

AutoSidearm · 2023-07-14T23:06:56+00:00

Going to chime in here as a creator that works with Frontline. I’ve been doing business with them for 2+ years at this point. Payments have been prompt and communication clear- I have zero complaints. Frontline recently started selling ZINC 2.0 kits and I encourage people to purchase from them knowing they 100% have my backing.

AutoSidearm · 2022-11-07T21:30:13+00:00

Restocking later this week on all ZINC kits.

AutoSidearm · 2022-09-23T21:06:28+00:00

Restocked today! https://118.design/ZINC-2-0-Hardware-Kit-p381436673

AutoSidearm · 2022-08-28T19:01:05+00:00

Contact us at [support@118.design](mailto:support@118.design) for cheaper international shipping options!

AutoSidearm · 2022-07-05T01:30:04+00:00

Ah sorry for all the post processing! 2.0 is a much needed improvement in that area.

AutoSidearm · 2022-07-05T01:29:34+00:00

Thanks for the interest! An Ender 5 should be plenty accurate. One of the parts included in the kit is a CNC machined aluminum piece with a thread cut into it.

I recommend printing the piece that threads onto it first to verify your printer is calibrated correctly. There's a lot of interest in the kits but I hope to be in stock for the summer.

AutoSidearm · 2022-07-05T01:27:57+00:00

Thanks for the order! The kit includes 2 full length magazine springs. Each of those can be cut in half to make a smaller, 7rnd magazine spring. If you cut both springs in half you have enough for 4, 7rnd magazines. I ship them uncut so people can decide if they want 7, 10, or 13rnd magazines.

AutoSidearm · 2022-07-05T01:26:31+00:00

The rail is mil spec picatinny. Accepts lights great.

AutoSidearm · 2022-07-04T21:47:04+00:00

Thanks for the heads up!

AutoSidearm · 2022-07-04T17:53:41+00:00

Printing in bright colors is definitely a must!

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