Arduino-compatible wireless sensor node based on ATmega328, with onboard RTC, CR2032 backup battery, microSD socket, dual-voltage (5 V/3.3 V) I2C hub, and an XBee-form-factor socket. Functionally identical to the ATmega168 variant but with double the flash (32 kB vs 16 kB).
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| D0 | signal | |||
| D1 | signal | |||
| D2 | signal | |||
| D3 | signal | |||
| D4 | signal | |||
| D5 | signal | |||
| D6 | signal | |||
| D7 | signal | |||
| D8 | signal | |||
| D9 | signal | |||
| D10 | signal | |||
| D11 | signal | |||
| D12 | signal | |||
| D13 | signal | |||
| A0 | signal | |||
| A1 | signal | |||
| A2 | signal | |||
| A3 | signal | |||
| A4 | signal | |||
| A5 | signal | |||
| VIN | power | |||
| 5V | power | |||
| 3.3V | power | |||
| GND | ground | |||
| RESET | control | |||
| I2C_VCC | power | |||
| I2C_SDA | signal | |||
| I2C_SCL | signal |
USB · 3.3 V
Confirm the data interface matches your host board.
Module pins: VIN, 5V, 3.3V, I2C_VCC, GND, D0, D1, D2. 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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