ESP8266 ESP-01 WiFi Module — 802.11 b/g/n, UART

ESP8266 ESP-01 WiFi Module — 802.11 b/g/n, UART

The ESP8266 ESP-01 is the most compact and widely used WiFi module for adding wireless connectivity to Arduino and microcontroller projects. Communicates via UART AT commands at 3.3V — connect to any microcontroller with a serial port to add 802.11 b/g/n WiFi to your project. Can also be programmed directly with the Arduino IDE or ESP-IDF as a standalone WiFi microcontroller.

Key Specifications

• WiFi: 802.11 b/g/n | Protocol: TCP/IP
• MCU: ESP8266EX | Clock: 80MHz (up to 160MHz)
• Flash: 1MB | SRAM: 64KB instruction / 96KB data
• I/O: 2 GPIO pins (GPIO0, GPIO2) | Interface: UART (TX/RX)
• Operating voltage: 3.3V | Current: up to 215mA (TX peak)
• Antenna: PCB trace antenna | Connector: 2mm pitch 8-pin header
• Compliance: RoHS compliant

Why Choose This?

• ✅ Ultra-compact — smallest ESP8266 module, ideal for embedded WiFi installations
• ✅ UART AT commands — add WiFi to any Arduino or microcontroller with a serial port
• ✅ Standalone programmable — run custom firmware directly on the ESP8266 via Arduino IDE
• ✅ Low cost WiFi — most affordable way to add 802.11 WiFi to any project

Typical Applications

• Arduino WiFi shield replacement
• IoT sensor nodes and smart home devices
• Remote monitoring and data logging via WiFi
• Standalone ESP8266 WiFi microcontroller projects