The ESP-01 is a self-contained SOC (System On a Chip) with integrated TCP/IP protocol stack that can give any microcontroller access to your Wi-Fi network.It can either be used as a “Wi-Fi shield” for an Arduino (via AT commands) or programmed as a standalone, ultra-low-power microcontroller using the Arduino IDE.Despite its tiny size, it packs a 32-bit processor and 1MB of Flash memory, making it a favorite for home automation and wireless data logging.
Key Features
Ultra-Compact Footprint: Smaller than a postage stamp, making it ideal for wearable or embedded tech.
Dual Mode Functionality: Use it as a Serial-to-Wi-Fi bridge for Arduino or as a standalone MCU.
High Compatibility: Fully supported by the Arduino IDE, MicroPython, and NodeMCU (Lua).
Integrated Antenna: Features an on-board PCB trace antenna with surprisingly good range for indoor use.
IoT Ready: Perfect for MQTT, HTTP requests, and creating local web servers to control relays.
Technical Specifications
Feature
Specification
Microcontroller
ESP8266 (32-bit)
Operating Voltage
3.3V ONLY (Not 5V tolerant)
Current Consumption
Max ~250mA (during Wi-Fi transmission)
Flash Memory
1 MB
Wi-Fi Protocols
802.11 b/g/n (2.4 GHz)
Security
WPA / WPA2
GPIOs
2 Pins (GPIO0 and GPIO2)
Dimensions
24.8mm x 14.3mm
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