Adafruit released a new Feather Express board based on the STM32F405 microcontroller. Adafruit will focus on CircuitPython with the new board, but with all the time we spent using STM32CubeIDE, we just had to try programming it with C!
In this tutorial, we’ll create a quick blinking LED example and upload it to the board using the built-in DFU bootloader. That will require using the dfu-util tool, and if you’re on Windows, you’ll need to install the WinUSB driver via Zadig.
From there, we’ll create a simple temperature logger. The Feather STM32F405 Express has a built-in SD card and STEMMA-QT connector, so we’ll take a reading from a PCT2075 sensor over I2C, print it out over the virtual serial port (USB), and log it to a file on the SD card.
Finally, we’ll use the test points on the back of the board to break out the SWD debug port. That will allow us to perform step-through debugging operations on the board.
As 2022 starts, let’s take some time to share our goals for CircuitPython in 2022. Just like past years (full summary 2019, 2020, and 2021), we’d like everyone in the CircuitPython community to contribute by posting their thoughts to some public place on the Internet. Here are a few ways to post: a video on YouTub, a post on the CircuitPython forum, a blog post on your site, a series of Tweets, a Gist on GitHub. We want to hear from you. When you post, please add #CircuitPython2022 and email email@example.com to let us know about your post so we can blog it up here.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
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