These FeatherWings were designed to provide Stemma and StemmaQT connections for host Feathers (like the Feather M4 Express) and to permit certain FeatherWings to act as standalone Stemma devices.
The Stemma Host FeatherWing has two dual-connector pads that can be either Stemma 2.0mm pitch or StemmaQT 1.0mm pitch. The Host board can be configured for UART (RX/TX) or I2C (SDA/SCL) communications at 3-volt or 5-volt levels.
The StemmaWing Backpack board stacks onto a FeatherWing that uses UART or I2C communications, furnishing the attached wing with +3.3-volt power harvested from the connected Stemma cable. The Backpack also provides two dual-connector pads.
These designs were derived from working prototypes but as of this writing are untested.
8-bit Counter Featherwing
This Featherwing is an 8-bit counter, with corresponding LEDs. It uses 2 SN74HC191DR 4-bit up/down presettable, cascadable, counters from TI in series to generate an 8-bit counter. The Feather provides power, clock signal, direction, counting enable, and resetability. The 8-bits are connected to 8 LEDs, so that you can visually see the bits counting up. The speed and direction of the counting are controlled by the Feather. You can also reset the counter to zero with the Feather. All you need to do is jumper any of the available Feather pins to the appropriate control pins, upload your code, and off you go.
This project is based off of a similar 8-bit counter I built out of components I found at my school’s student-run Makerspace. That counter used a 555 timer to generate the clock signal. This project is very simple, but still fun to make.
Want to learn more about Feather? See the Awesome Feather list for details.
We are angry, frustrated, and in pain because of the violence and murder of Black people by the police because of racism. We are in the fight AGAINST RACISM. George Floyd was murdered, his life stolen. The Adafruit teams have specific actions we’ve done, are doing, and will do together as a company and culture. We are asking the Adafruit community to get involved and share what you are doing. The Adafruit teams will not settle for a hash tag, a Tweet, or an icon change. We will work on real change, and that requires real action and real work together. That is what we will do each day, each month, each year – we will hold ourselves accountable and publish our collective efforts, partnerships, activism, donations, openly and publicly. Our blog and social media platforms will be utilized in actionable ways. Join us and the anti-racist efforts working to end police brutality, reform the criminal justice system, and dismantle the many other forms of systemic racism at work in this country, read more @ adafruit.com/blacklivesmatter
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.