Overview
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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