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Wi-Fi Board D1 is an ESP8266-based development board similar to the Arduino Uno but with built-in Wi-Fi capabilities. It features a micro-USB port for programming and power. The board supports Arduino IDE and MicroPython for flexible firmware development. It includes multiple GPIOs, PWM, and analog input for sensor interfacing. The board runs at 3.3V logic and features an onboard voltage regulator. It supports deep sleep mode for energy-efficient applications. Ideal for IoT development, wireless communication, and cloud-based projects.