ESP8266 ESP-01 / ESP-01S Wi-Fi Module
Ultra-compact 2.4 GHz Wi-Fi module with integrated TCP/IP stack, 32-bit Tensilica MCU, and 2x4 (8-pin) 2.54mm pitch header.
Aliase:ESP-01, ESP-01S, ESP8266 Serial Wi-Fi
2x4 Male Header (Top View)
8 Pins
Pinout Table8
| Pin | Signal / Name | Type | Alternative Functions |
|---|---|---|---|
| 1 | GND | Ground | Ground (0V) |
| 2 | TXD | Digital | UART0 TXDGPIO1 |
| 3 | GPIO2 | Digital | GPIO2 — General Purpose I/O (must be HIGH during boot for normal operation; LOW selects UART1 debug output)TXD1 — UART1 Transmit (debug output only; active during boot) |
| 4 | CH_PD | Digital | Chip Power DownChip Enable — must be pulled HIGH (≥0.9V) for normal operation; do not leave floating |
| 5 | GPIO0 | Digital | GPIO0 — General Purpose I/OBoot Mode Select — pull LOW during reset to enter flash programming mode (UART download); HIGH = normal boot |
| 6 | RST | Digital | External Reset (Active Low) |
| 7 | RXD | Digital | UART0 RXDGPIO3 |
| 8 | VCC | Power | +3.3V Power Supply (DO NOT CONNECT 5V) |