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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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4.3 ★★★★★
Based on 22 reviews
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Product Reviews
★★★★★ 5
Comfy, soft, helps me sleep without pain.
Color: White, Size: Queen
These pillows are very comfy. Lately, I'd been waking up with pinched nerves in my neck and shoulders so I decided to try new pillows. I've been using these pillows for a couple of days now and I no longer have any pinched nerves. They're so comfortable to rest my head on. If I had to make one constructive criticism, its that I wish they were thicker. I know its just personal preference but I like my head to be elevated more.. however, using 2 of these pillows does the trick! Also, they come packaged really well... vacuum sealed and in a box (which is good because they sat out in the rain for 7 hours).. and they didnt have a strange odor to them. For the price, they are great.
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Reviewed in the United States on April 17, 2026
★★★★★ 5
GREAT
Color: White, Size: Queen
These pillows are fantastic. I bought them for my kids beds and decided I needed some for myself. They're the perfect firmness. I don't need to fluff them in the middle of the night and have no neck pain. I have washed them in my home washing machine and they've held up great. I highly recommend them.
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Reviewed in the United States on May 8, 2026
★★★★★ 5
Just perfect. Well made, No Issues Just one perfect sleep zzzzzzzzzzz😴
Color: White, Size: Queen (Pack of 2)
I had down pillows, and foam pillows, and other synthetic pillows etc and some were ok and others were not. I cannot get a great nights sleep if I am constantly having to adjust my pillow during the night. I ordered these pillows as I sleep on my side mostly but sometimes on my back. When they arrived I followed the directions (as they are in a vacuum pack) and only takes a few minutes for them to acclimate. Then put pillow cases on them and off to bed. I had the BEST sleep I have had in YEARS !!!!! The pillows are great. They keep your head comfortable and cool (No Sweating) and super comfortable. The only issue is after a perfect nights sleep, I find I really do not want to get out of bed in the morning..One great thing, is I am retired so I really do not have to get up out of bed until I want to 😴😳. The pillows are well made and feel like expensive down filled pillows but softer. I am VERY satisfied with the pillows. I just wish I would have found these pillows years ago. But now I have them and the perfect sleep that they provide. Dr Dave
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Reviewed in the United States on June 4, 2026
★★★★★ 5
Great sleep
Color: White, Size: Queen (Pack of 2), Color: White, Size: Queen (Pack of 2)
Finally found a pillow that is comfortable. Tested about 5 until I found the right one. This is perfect for back and side sleepers. Firm, but soft. Just enough filling and great quality. Will hold up for many years.
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Reviewed in the United States on May 24, 2026
★★★★★ 4
Good overall
Color: White, Size: Standard (Pack of 2)
Bought these for our guest bedroom. They are quite overstuffed, so if you like full pillows this will be your thing. As such they are dense and firm. The height is a bit much if you are small framed, but are comfortable overall and stay cool enough to be nice in the summer.
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Reviewed in the United States on February 24, 2026