If you’re bit-less, they’re also now selling an Arduino-centric starter kit with the Arduino module and 8 others (a battery, a few switches, a servo, and a control dial) for $89.

The previous generation Arduino UNO R3 used the 8-bit microcomputer ATmega328P as the MCU, but the Arduino UNO R4 is equipped with the ' Renesas RA4M1 ' that includes a 32-bit Arm Cortex-M4 core.