WEMOS D1 ESP8266 Wi-Fi Development Board – compatible with Arduino and NodeMCU
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The D1 is a WiFi-capable, ESP8266-based development board in the shape of an Arduino UNO board format.
This board is compatible with the Arduino IDE and NodeMCU.
The D1 also features an on-board switching power supply which allows you to power the board from a power supply up to 15V. It comes with 11 GPIO pins (input/output/PWM/I2C; except D0), and 1 analog input. The PWM resolution is 10bit (1MHz frequency).
The integrated 5V switching power supply (1A) is followed by a 3.3V LDO to supply power for the Wifi module and the 3.3V output (power supply for sensors and shields).
Note: This is a 3.3V logic level device and higher levels on any pin can destroy it. The max. input voltage for the analog pin is 3.2V