The ESP-01 is a compact WiFi module based on the popular ESP8266 chip, providing an easy way to add wireless connectivity to Arduino and other microcontroller projects. This upgraded version features 1MB of flash storage—double the original—allowing for more complex firmware and OTA updates. Control it with AT commands over serial, or flash custom firmware like NodeMCU or Arduino to turn it into a standalone WiFi-enabled microcontroller. Key Features ESP8266 Chip – 802.11 b/g/n WiFi with full TCP/IP stack 1MB Flash – Upgraded from 512KB for more firmware options AT Command Support – Control via serial at 115200 baud (default) Cloud Service Ready – Supports remote transmission services Compact Form Factor – 8-pin module for easy integration 3.3V Operation – Low power consumption Specifications Chip – ESP8266 Flash – 1MB WiFi – 802.11 b/g/n Default Baud Rate – 115200 Operating Voltage – 3.3V GPIO Pins – 2 (GPIO0, GPIO2) Ideal For Adding WiFi to Arduino projects IoT sensors and home automation Wireless data logging Learning embedded WiFi development Note: The ESP-01 requires 3.3V power and logic levels. Use a level shifter or voltage divider when connecting to 5V systems like Arduino Uno.
