3 X Microcontroller and Development Boards UNO ESP8266 WEMOS D1

Actual items in photo will be shipped

These are three different microcontroller development boards commonly used for electronics, IoT (Internet of Things), and prototyping projects.

1. NodeMCU ESP8266 Development Board (Left)

Main Chip: ESP8266 (ESP-12F / ESP-12E module)

Key Features: Built-in Wi-Fi, Micro-USB port for programming and power, onboard voltage regulator, and breadboard-friendly layout.

Best Used For: Compact Wi-Fi/IoT projects, smart home devices, and wireless sensors.

2. WeMos D1 R1 Wi-Fi Board (Middle)

Main Chip: ESP8266

Key Features: Combines the Wi-Fi capability of the ESP8266 chip with the familiar Arduino Uno layout/form factor. It operates at 3.3\text{ V} logic and is compatible with many Arduino shields.

Best Used For: Projects requiring Wi-Fi connectivity while maintaining compatibility with standard Arduino Uno shields and hardware layouts.

3. Arduino Uno R3 (SMD Version) (Right)

Main Chip: ATmega328P (Surface Mount Package)

Key Features: Standard 5\text{ V} microcontroller board, USB Type-B connection, DC power jack, and standard header pin layout. (Note: Unlike the other two, this standard board does not have built-in Wi-Fi).

Best Used For: Beginners learning electronics, offline robotics, sensor reading, and general micro-controller prototyping.