Hello! I have been inspired by previous projects such as the tiny mosquito board by @Valentine to create a mini version (16mm diameter) of my own that can fit on to the back of some tiny 16mm PM1105 motors I have found on aliexpress. I would be immensely grateful if I could get some feedback on the…

Pleased to say my board design has come out well, everything appears to be working as intended, thanks again to the suggestions above with powering from the DRV8311, it seems to cope fine powering everything from its 3.3v regulator which has helped keep the board size to only 16mm diameter. [IMG_5…

[Screenshot 2025-06-22 at 19.11.53]

[Screenshot 2025-06-22 at 19.12.49]

[Screenshot 2025-06-22 at 19.12.21]

Looks pretty good! Can’t go wrong with two unbroken ground planes. The fault pin in the datasheet says “requires an external pullup to AVDD”, but I’m never sure if they mean it’s required to get a proper reading from the fault pin, or if the chip will refuse to run without it. And without SPI to re…

Hey there Harry Wanted to give my two cents on your schematic. I’ve made a few dozen boards using the DRV8311. Mostly just the same board several times trying to fix my mistakes lol. A few things I wanted to point out. I think you have a mistake on the 3.3V supply coming from the DRV8311. The 3.3v…

Hey, congratulations, that looks like a really nice and very tiny driver :slight_smile: is its design open source? I’m sure people here would be interested…

@Harry_Brenton is this open source? Do you have a link to the project and BOM?

also testing PM1105, would like a few of these boards… Rather than the tight soldering, perhaps JST SH? with pre-crimped ends…

PCB Design Check - DRV8311 based BLDC Controller

hardware support

Harry_Brenton June 22, 2025, 6:21pm 2