About this product
The D1 R2 is an ESP8266 Wi-Fi development board in the Arduino UNO shield footprint, with onboard USB programming, 2.4 GHz Wi-Fi, digital I/O, and a single ADC input. Everything runs at 3.3 V logic, so 5 V shields and sensors need level shifting. It is programmed from the Arduino IDE and suits connected sensors, home automation, and IoT prototypes.