El ESP8266 D1 Mini V2 es una placa de desarrollo pequeña con WiFi basada en el ESP8266 para proyectos IoT. Ofrece interfaces habituales como UART (TX/RX), I2C (SDA/SCL) y SPI (SCK/MISO/MOSI/SS), además de una entrada analógica (A0) y pines GPIO digitales. Lo habitual es alimentar la placa con 3,3V (con GND conectado) y programarla desde un entorno tipo Arduino.
| Pin | Señal | Descripción |
|---|---|---|
RST |
reset | Active-low reset input for the ESP8266; pull low to restart the module. |
A0 |
analog | Analog ADC input; reads 0-3.3V on the D1 mini board. |
D0 |
digital | ESP8266 GPIO16 digital I/O; commonly used for deep-sleep wake to RST. |
D5 |
SCK | ESP8266 GPIO14 digital I/O; hardware SPI clock SCLK. |
D6 |
MISO | ESP8266 GPIO12 digital I/O; hardware SPI MISO data input. |
D7 |
MOSI | ESP8266 GPIO13 digital I/O; hardware SPI MOSI data output. |
D8 |
SS | ESP8266 GPIO15 digital I/O; SPI chip-select, boot strap must be low at reset. |
3V3 |
power | Regulated 3.3V supply rail for the ESP8266 and low-power external circuits. |
TX |
TX | UART0 transmit from ESP8266; also used for programming and serial debug. |
RX |
RX | UART0 receive to ESP8266; use 3.3V logic for programming and serial input. |
D1 |
SCL | ESP8266 GPIO5 digital I/O; commonly used as I2C SCL clock. |
D2 |
SDA | ESP8266 GPIO4 digital I/O; commonly used as I2C SDA data. |
D3 |
digital | ESP8266 GPIO0 digital I/O; boot strap pin, low at reset enters flashing mode. |
D4 |
digital | ESP8266 GPIO2 digital I/O; connected to onboard LED on many D1 mini boards. |
G |
ground | Ground reference for power and all 3.3V logic signals. |
5V |
power-high | 5V input rail from USB or external supply feeding the onboard 3.3V regulator. |
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