UNTESTED: Stemma Host FeatherWing: The Stemma Host FeatherWing is a single Stemma or StemmaQT interface, compatible with the Adafruit Feather format. It is designed for use with a Feather MCU board such as the Feather M4 Express and will selectively communicate via UART (RX/TX) or I2C (SDA/SCL). The Stemma connector power is provided by the host Feather and is selectable for either 3 volts or ~5 volts. Stemma 2.0mm and Stemma-QT 1.0mm connector types are supported. For use ONLY with Feather MCU boards that provide at least a 3.3-volt power source. USB or battery power is needed for Stemma ~5-volt signals.

UNTESTED: StemmaWing Backpack: A stackable add-on backpack that transforms a UART or I2C FeatherWing into a self-powered standalone Stemma or Stemma-QT interface.

Cedar Grove Robot Friend (v03): A passive FeatherWing adapter for stacking an Adafruit PyBadge or PyGamer with a Crickit FeatherWing. Includes a prototyping area for custom circuitry and sensors.

AD9833 ADSR Waveform Generator FeatherWing with amplitude control: An Adafruit Feather-compatible module. The Waveform Generator with amplitude control produces an op-amp buffered sine, triangle, or square wave output with a practical frequency range of 0.5Hz to 100kHz with 0.1Hz resolution. Frequency accuracy and stability is determined by the 25MHz clock source. Waveform Generator control is via the Feather SPI bus; chip select is provided by the Feather’s D6 logic pin. Output signal peak-to-peak amplitude is I2C controlled with an AD5245 8-bit digital potentiometer (10K, 256-step). Peak output value is potentiometer adjustable with a maximum unipolar output of slightly less than 3.3 volts. The wing derives its power from the host Feather’s 3.3V power.

RoverWing: The RoverWing is an Adafruit Feather-compatible module, used to transport the Trinket M0 into the Feather ecosystem. The wing connects the Trinket’s five GPIO pins to the Feather pin-out and provides optional LiPo battery support. On-board jumpers reconfigure the Trinket M0 pins for general I/O, I2C, and UART configurations. Jumper-enabled LiPo battery management circuitry accomodates battery capacity of 100mAhr or greater. The battery charging rate is fixed at 100mA. The Feather-compatible ENABLE (EN) power control pin controls battery power to the attached Trinket M0 board.