ESP-01 ESP8266 WiFi Module

ESP-01 ESP8266 Serial WiFi Module

The ESP-01 is the most compact and widely used WiFi module based on the ESP8266 chipset. It enables any microcontroller with a UART interface — including Arduino, STM32, and PIC — to connect to a WiFi network using simple AT commands, making it a go-to choice for adding wireless connectivity to embedded projects.

Key Features

• Chipset: ESP8266EX
• WiFi Standard: 802.11 b/g/n (2.4 GHz)
• Operating Voltage: 3.3V (not 5V tolerant — use a level shifter)
• Flash Memory: 1 MB
• GPIO Pins: 2 × GPIO (GPIO0, GPIO2)
• Interface: UART (TX, RX) with AT command set
• Antenna: Onboard PCB antenna
• Modes: Station, Access Point, Station+AP
• Dimensions: 24.75mm × 14.5mm

Ideal Applications

• Adding WiFi to Arduino or other microcontrollers via AT commands
• Low-power IoT sensor nodes
• Smart home relay control
• Serial WiFi bridges and gateways
• Standalone ESP8266 projects (programmable via Arduino IDE)

Programming & Compatibility

• Use as a WiFi co-processor with AT firmware (default)
• Flash with custom firmware using Arduino IDE or NodeMCU
• Supports MicroPython and Lua (NodeMCU)
• Requires a 3.3V power supply and USB-to-TTL adapter for programming

Package Includes

• 1 × ESP-01 ESP8266 WiFi Module

Note: A 3.3V power source is required. Do not connect directly to 5V Arduino pins without a voltage divider or level shifter.