The ESP8266 D1 Mini Pro is a compact WiFi-enabled microcontroller development board commonly used for IoT prototypes. It provides GPIO for UART (TX/RX), I2C (SDA/SCL), and SPI (SCK/MISO/MOSI/SS), plus an analog input (A0) and a reset pin (RST). Typical connections include powering the board via 3.3V and using GND as reference.
| Pin | Signal | Description |
|---|---|---|
RST |
reset | Active-low reset input for the ESP8266; pull low to restart the module. |
A0 |
analog | Analog ADC input; reads a variable voltage through the board's input divider. |
D0 |
digital | ESP8266 GPIO16; usable digital I/O and deep-sleep wake input. |
D5 |
SCK | ESP8266 GPIO14; common SPI SCK clock pin and general digital I/O. |
D6 |
MISO | ESP8266 GPIO12; common SPI MISO input and general digital I/O. |
D7 |
MOSI | ESP8266 GPIO13; common SPI MOSI output and general digital I/O. |
D8 |
SS | ESP8266 GPIO15; common SPI chip-select, boot strap pin, and digital I/O. |
3V3 |
power | Regulated 3.3 V supply rail for the ESP8266 and low-current external circuits. |
TX |
TX | UART transmit output from the ESP8266 for serial programming and debugging. |
RX |
RX | UART receive input to the ESP8266 for serial programming and communication. |
D1 |
SCL | ESP8266 GPIO5; commonly used as I2C SCL clock and general digital I/O. |
D2 |
SDA | ESP8266 GPIO4; commonly used as I2C SDA data and general digital I/O. |
D3 |
digital | ESP8266 GPIO0; boot strap pin and general digital I/O, affects flashing mode. |
D4 |
digital | ESP8266 GPIO2; boot strap pin, often connected to the onboard LED. |
GND |
ground | Ground reference for power and all logic signals. |
5V |
power | 5 V input/output rail, typically from USB or external supply to the regulator. |
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