The Arduino Nano is a compact, breadboard-friendly microcontroller board based on the ATmega328P. It features 14 digital I/O pins, 8 analog inputs, PWM support, and USB connectivity, making it perfect for DIY electronics, robotics, automation, and IoT projects.

The ESP32 Dev Kit V1 is a powerful, low-cost Wi-Fi and Bluetooth development board based on the ESP32 SoC from Espressif Systems. With dual-core processing, built-in Wi-Fi and Bluetooth, multiple GPIOs, ADC, DAC, PWM, and SPI/I2C support, it's perfect for IoT, smart home, and embedded applications.

The PIC16F877A is a powerful 40-pin DIP (Dual In-line Package) microcontroller from Microchip. It features a high-performance RISC CPU, 256 bytes of EEPROM, 368 bytes of RAM, and 33 I/O pins, making it ideal for embedded applications, automation, and control systems.