Seeed Studio XIAO SAMD21 - Smallest Arduino Compatible Microcontroller with Rich Interfaces, 1pc

Beetle-A Small Microcontroller for Arduino Leonardo with USB HID for IoT & Wearable Projects (20mm×22mm, ATmega32u4, 3V Battery Support)

ELEGOO UNO R3 Board ATmega328P with USB Cable(Arduino-Compatible) for Arduino

LUIRSAY 2Pcs Nano V3.0 Board ATmega328P/CH340G Chip Microcontroller Kit Compatible with Arduino IDE/PWM/SPI 5V 16M(USB C Port with 2Pcs USB Cable)

Arduino® UNO™ Q 4GB [ABX00173]- Hybrid Board, Qualcomm Dragonwing QRB2210 microprocessor (MPU) & STM32U585 Microcontroller(MCU), AI Vision, Voice, IoT, Robotics, Linux Debian OS, Wi-Fi 5, USB-C

flashtree 10pcs Atmega328P-PU Atmega328p Microcontroller with Uno R3 Bootloader DIP28

ELEGOO Mega R3 Project The Most Complete Ultimate Starter Kit with Tutorial Compatible with Arduino IDE

ESP-WROOM-32 ESP32 ESP-32S Development Board 2.4GHz Dual-Mode WiFi + Bluetooth Dual Cores Microcontroller Processor Integrated with Antenna RF AMP Filter AP STA Compatible with Arduino IDE (1 PCS)

AYWHP 3PCS Nano V3.0 Board With Cable, ATmega328P, CH340G Chip 5V 16M, Microcontroller Compatible With Arduino (USB C Port)

Electronics for Beginners: A Practical Introduction to Schematics, Circuits, and Microcontrollers