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Description
Adafruit Feather STM32F405 ExpressST takes flight in this upcoming Feather board. The new STM32F405 Feather (video) that we designed runs CircuitPython at a blistering 168MHz our fastest CircuitPython board ever! We put a STEMMA QT Qwiic port on the end, so you can really easily plug and play I2C sensors. This Feather has lots of goodies: STM32F405 Cortex M4 with FPU and 1MB Flash, 168MHz speed 192KB RAM total 128 KB RAM for general usage + 64 KB program only cache RAM 3. 3V logic,
ST takes flight in this upcoming Feather board. The new STM32F405 Feather (video) that we designed runs CircuitPython at a blistering 168MHz – our fastest CircuitPython board ever! We put a STEMMA QT / Qwiic port on the end, so you can really easily plug and play I2C sensors.
This Feather has lots of goodies:
- STM32F405 Cortex M4 with FPU and 1MB Flash, 168MHz speed
- 192KB RAM total - 128 KB RAM for general usage + 64 KB program-only/cache RAM
- 3.3V logic, but almost all pins are 5V compliant!
- USB C power and data - our first USB C Feather!
- LiPo connector and charger
- SD socket on the bottom, connected to SDIO port
- 2 MB SPI Flash chip
- Built in NeoPixel indicator
- I2C, UART, GPIO, ADCs, DACs
- Qwiic/STEMMA-QT connector for fast I2C connectivity
- We use the built-in USB DFU bootloader to load firmware. It does not come with a UF2 bootloader.
With CircuitPython basics running on this board, it's fast to get all our drivers working, then use the built in plotter in Mu to instantly get sensor data displaying within 3 minutes of unboxing.
You can use MicroPython, CircuitPython or Arduino IDE with this board, with some caveats. This board and chipset is new so expect rapid developments and updates!
CircuitPython support is under development. We have digital IO, analog in/out, I2C, SPI, PWM working so far and more on the way. For example, the SDIO SD card is not yet supported natively. DisplayIO is also not yet supported.
Arduino is supported through STM32duino. There's no auto-reset bootloader support yet so you have to pull the BOOT0 pin high and manually reset before uploading. That said, STM32 support is really good, and we were able to run just about every sketch we tried.
MicroPython support is very solid but Adafruit does not provide MicroPython libraries for sensors!
We tested this in Arduino STM32duino with all our FeatherWings and only the RFM69/RFM9x libraries did not work (they are very platform specific). Its an extraordinarily fast Feather, and our first foray into STM32 - very exciting!
Features
- Product Dimensions: 52.0mm x 23.0mm x 10.0mm / 2.0" x 0.9" x 0.4"
- Product Weight: 6.2g / 0.2oz
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4.0 ★★★★★
Based on 23 reviews
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Product Reviews
★★★★★ 5
Good shelves for the price can be challenging to install correctly
Size: 16 Inch, Color: White, Size: 16 Inch, Color: White
Good quality shelves for the price. Happy with the purchase. They give you assorted hardware to mount each shelf. Wall anchors for masonry or brick and anchors for drywall as well as screws to affix shelf to the wall bracket. The installation was fairly easy but it can be a bit difficult to get the bracket leveled on the wall. The “level” they give you is useless, it is only the tube - not in a housing, so 1 1/2” long. You will need a better level. Basically you place the bracket where you want the shelf to go then make sure it is level and take a pencil to mark the holes. We ended up using a heavier quality wall anchor so only needed 2 anchors instead of the four they send you. Once the bracket is on, slide the shelf onto the bars coming from the bracket and use the 2 set screws to secure it in place. Check for level and if it isn’t you can remove shelf and loosen bracket screws and wiggle the bracket while still attached while retightening screws. We had to re-level one of our shelves this way. Hope this helps and that it makes sense. As for weight capacity I wouldn’t want to put more than a couple of pounds on a shelf. As it is secure, it is hollow inside and too much weight would probably either cause the shelf to sag or damage your wall
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Reviewed in the United States on February 25, 2025
★★★★★ 5
Excellent product with height recommendation
Size: 24 Inch, Color: White, Size: 24 Inch, Color: White
My bathroom renovation is turning out great. These shelves are beautifully stable and show no visible assembly. The idea of these floating shelves is brilliant.
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Reviewed in the United States on February 19, 2026
★★★★★ 5
Beautiful and sturdy
Size: 24 Inch, Color: White
Excellent quality shelves. All hardware came with them and also the stickers to cover the screws. I also placed a plant on one of the shelves and it’s not leaning and again very nice and secure.
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Reviewed in the United States on May 13, 2026
★★★★★ 5
Great shelves
Size: 24 Inch, Color: White
Easy to assemble and comes with everything you need for drywall or wood. Nice color and texture and comes with stickers to hide the holes underneath. I bought two sets of three. These are very long, so I recommend just using two at a time.
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Reviewed in the United States on February 8, 2026
★★★★★ 5
Beautiful, sturdy shelves — perfect for any room!
Size: 15.6 inch, Color: White, Size: 15.6 inch, Color: White
These 16-inch solid wood floating shelves exceeded my expectations. The quality of the wood is excellent — thick, smooth, and very sturdy. They were easy to install, and all the hardware was included. Once mounted, they feel secure and can hold a good amount of weight without sagging.
I love how they add a clean, modern touch to the room. I’ve used them to display small framed photos, books, and decor items in my living room, and they look fantastic. The small ledge is a nice feature too — it keeps things from sliding off easily.
Great for any space — bedroom, kitchen, hallway — and they’re both functional and stylish. Highly recommended!
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Reviewed in the United States on July 13, 2025
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