If you’ve started to play with the brand new Raspberry Pi 3 you might have discovered, like Ladyada did on this live stream, that the serial UART pins don’t behave exactly like they did in the past. Brian Dorey has a great blog post that talks about one of the Pi 3 changes to use the hardware UART of the chip to talk to the Bluetooth module. A consequence of this change is that the UART pins on the GPIO header, like you might use to connect to a GPS device, a serial cable, etc., now use a ‘mini-UART’ that’s tied to the CPU speed. This means the GPIO UART might not have a stable baud rate as it changes with the CPU speed.
Brian’s blog post mentions a workaround from the Pi foundation to disable Bluetooth, however he also found a great way to remap the GPIO pins to use the hardware UART and the Bluetooth module to use the mini-UART. There might still be issues with Bluetooth using this option, but it’s great to have in case you need a very stable UART on the GPIO pins. Check out Brian’s post for all the details.
8-6-2021 (August 6, 2021) is the Snakiest day of the year and it’s also this year’s CircuitPython Day! The day highlights all things CircuitPython and Python on Hardware. See you there!
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.