The maximum input voltage for the analog pin is 3.2V. Please pay attention when you connect other active peripherals to the I/O pins, because this is a 3.3V logic level device and higher levels on any pin could damage it. 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). The PWM resolution is 10bit (1MHz frequency). Arduino: 1.8.9 (Windows 10), Board: 'Generic ESP8266 Module, 80 MHz, Flash, Disabled, All SSL ciphers (most compatible), ck, 26 MHz, 40MHz, DOUT (compatible), 512K (no SPIFFS), 2, nonos-sdk 2.2. The D1 features an on-board switching power supply which allows you to power the board from a power supply up to 24V, 11 GPIO pins (can be used as input/output/PWM/I☬, except D0), and 1 analog input. 80 MHz Processor / 4M Flash FCC Certified ESP8266-12F Module 11 digital input/output pins, all pins have interrupt/pwm/I2C/one-wire supported (except for D0). Full integration of a microcontroller ATmega328 and a Wi-Fi chip ESP8266 with 32 MB memory on. This board is compatible with the Arduino IDE and with NodeMCU. It is a modernized version of the classic Arduino UNO R3 board. ESPDuino ESP8266 ESP-13 WIFI Development Board Module Arduino UNO R3 Format. This WeMos D1 R2 development board for Arduino / NodeMCU is a WiFi capable ESP8266 based development board in the format of the Arduino UNO R3. It is a customized version of the classic ARDUINO UNO R3 board. RobotDyn UNO+WIFI R3 is a customized version of the classic ARDUINO UNO R3 board which has two Processors: Atmel ATmega328 microcontroller and ESP8266 WiFi chip.
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