Meet the Raspberry Pi Pico: a tiny $4 microcontroller built on RP2040, which is the company’s newly developed chip. The chip has a dual-core ARM Cortex-M0+ @ 133MHz, 264KB on-chip RAM, 30 GPIO pins, 16 × PWM channels, 2 × UARTs, 2 × SPI controllers, and 2 × I2C controllers.
Raspberry Pi Pico has a power supply chip supporting input voltages from 1.8-5.5V. It has a single push button that lets you enter USB mass-storage mode at boot. It is ready for MicroPython programming.