
Round, sewable ATmega32u4 development board (45 mm diameter, 4.7 g) for e-textile projects, with 14 conductive-thread pads, onboard NeoPixel, micro-USB (HID), 3.3V/250mA regulator, and a polarized JST battery connector accepting 3.5–16 V input.

UART receive and GPIO
UART transmit and GPIO
I2C data, GPIO, interrupt
I2C clock, GPIO, interrupt
GPIO, analog input, PWM
GPIO, analog input, PWM
GPIO, analog input, PWM
GPIO and analog input
SPI MISO and GPIO
SPI clock and GPIO
SPI MOSI and GPIO
Switched battery/USB-derived high-current output for NeoPixels or servos, not recommended as input
Onboard regulator output
Ground
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| D0RX | sewable pad | GPIO, UART | UART receive and GPIO | 3.3V logic |
| D1TX | sewable pad | GPIO, UART | UART transmit and GPIO | 3.3V logic |
| D2SDA | sewable pad | GPIO, I2C | I2C data, GPIO, interrupt | 3.3V logic |
| D3SCL | sewable pad | GPIO, I2C | I2C clock, GPIO, interrupt | 3.3V logic |
| D6A7PWM | sewable pad | GPIO, Analog, PWM | GPIO, analog input, PWM | 3.3V logic |
| D9A9PWM | sewable pad | GPIO, Analog, PWM | GPIO, analog input, PWM | 3.3V logic |
| D10A10PWM | sewable pad | GPIO, Analog, PWM | GPIO, analog input, PWM | 3.3V logic |
| D12A11 | sewable pad | GPIO, Analog | GPIO and analog input | 3.3V logic |
| D14MISO | 2x3 SPI header | GPIO, SPI | SPI MISO and GPIO | 3.3V logic |
| D15SCK | 2x3 SPI header | GPIO, SPI | SPI clock and GPIO | 3.3V logic |
| D16MOSI | 2x3 SPI header | GPIO, SPI | SPI MOSI and GPIO | 3.3V logic |
| VBATT | sewable pad | Power | Switched battery/USB-derived high-current output for NeoPixels or servos, not recommended as input | battery/USB selected output |
| 3.3V | sewable pad | Power | Onboard regulator output | 3.3V, about 100mA recommended |
| GND | sewable pad | Ground | Ground | 0V |
UART receive and GPIO
UART transmit and GPIO
I2C data, GPIO, interrupt
I2C clock, GPIO, interrupt
GPIO, analog input, PWM
GPIO, analog input, PWM
GPIO, analog input, PWM
GPIO and analog input
SPI MISO and GPIO
SPI clock and GPIO
SPI MOSI and GPIO
Switched battery/USB-derived high-current output for NeoPixels or servos, not recommended as input
Onboard regulator output
Ground
USB · 3.3 V
Confirm the data interface matches your host board.
Module pins: VBATT, 3.3V, GND, D0 / RX, D1 / TX, D2 / SDA, D3 / SCL, D6 / A7 / PWM. Schematik maps them to your board in the app.
Specialists: Teensy for high-clock audio and USB, Adafruit SAMD boards running CircuitPython or the Arduino IDE, proper STM32 eval kits, and the micro:bit classroom ecosystem. Schematik builds target ESP32, Arduino Uno, and Pico; come here when you have a specific reason to.
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