Axiometa Sparklet

The Axiometa Sparklet is a drop-in, pin-compatible replacement for the Arduino Nano that keeps the ATmega328P at 16 MHz and the original 45 × 18 mm, 30-pin footprint, but upgrades the hardware with a USB-C data/power port, linear converter supplying up to 1 A at 3.3 V, one user push-button, a user LED alongside the standard power and TX/RX indicators, and otherwise preserves the full set of Nano I/O—including 22 digital (6 PWM), 8 analog, SPI, I²C, UART—and the onboard reset circuitry.