The 1K Ohm Resistor (1/4W, Through-Hole) is a high-precision, general-purpose resistor commonly used for pull-up/pull-down circuits, voltage dividers, current limiting, and signal conditioning. Ideal for Arduino, ESP32, Raspberry Pi, and various electronic applications.

The 220 Ohm Resistor (1/4W, Through-Hole) is a high-precision, general-purpose resistor used for current limiting, voltage division, and circuit protection. It is ideal for LED current limiting, Arduino projects, power supplies, and electronic circuits.

The HC-SR04 Ultrasonic Sensor is a high-precision distance measurement module that uses ultrasonic sound waves to detect objects and measure distances ranging from 2cm to 400cm with an accuracy of ±3mm. It is ideal for robotics, obstacle detection, automation, and IoT applications.

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.