ESP-01 WiFi Module ESP8266 Wireless Transceiver

The ESP-01 WiFi Module ESP8266 Wireless Transceiver is the most compact and cost-effective way to add WiFi to any microcontroller project. With just 8 pins, it provides full WiFi connectivity for IoT and wireless communication applications.

Key Features

• Ultra-compact size (24.5mm x 14.5mm) for space-constrained designs
• 802.11 b/g/n WiFi with integrated TCP/IP stack
• AT command firmware preloaded for easy control
• Low cost WiFi solution for any microcontroller
• 8-pin header with UART, GPIO, and power pins
• 3.3V operation with low power consumption
• Arduino library support via ESP8266WiFi or AT commands

Technical Specifications

Applications

• Add WiFi to Arduino and other microcontrollers
• Compact IoT sensors with minimal footprint
• WiFi-to-serial bridges for legacy equipment
• Wireless relay controllers
• Remote data collection endpoints
• Smart switch retrofits in small enclosures

Important Notes

• REQUIRES external 3.3V regulator – module draws ~300mA during WiFi TX
• GPIO pins use 3.3V logic only – connecting 5V will damage module
• USB-to-TTL adapter required for programming (3.3V level)
• GPIO0 must be grounded during power-on for flash mode
• Limited GPIO – use ESP-12F or devkit for more pins