The ESP-01 ESP8266 is a compact and powerful WiFi transceiver module designed to add wireless connectivity to embedded systems. Based on the ESP8266 SoC, it allows microcontrollers to connect to WiFi networks and communicate over TCP/IP using simple serial (UART) commands, making it suitable for IoT, automation, and DIY networking applications.
Core Module Specifications
• Chipset: ESP8266EX WiFi SoC
• WiFi Standard: IEEE 802.11 b/g/n
• Frequency Band: 2.4 GHz ISM band
• Antenna: Onboard PCB antenna
Electrical & Interface
• Operating Voltage: 3.0 V – 3.6 V (typical 3.3 V)
• Logic Level: 3.3 V (not 5 V tolerant)
• Communication Interface: UART (TX, RX)
• Default Baud Rate: 115200 bps
• GPIO Pins Available: 2 (GPIO0, GPIO2)
• Enable Pin: CH_PD / EN
Performance Characteristics
• Wireless Modes: Station / SoftAP / Station + SoftAP
• Network Protocols: TCP, UDP, HTTP
• Security: WEP, WPA, WPA2
• Transmit Power: Up to +20 dBm
• Range: Up to 100 m (open space, antenna dependent)
Physical Characteristics
• Form Factor: Ultra-compact WiFi module
• Size: Approximately 14.3 mm × 24.8 mm
• Weight: Lightweight, suitable for compact designs
Compatibility
• Arduino (via UART or USB-to-TTL)
• STM32, AVR, PIC microcontrollers
• Raspberry Pi (serial interface)
Key Advantages
• Enables WiFi connectivity with minimal external components
• Supports AT commands as well as custom firmware
• Small size ideal for space-constrained designs
• Low-cost solution for IoT and wireless projects
Technical Insights
• Supports AT firmware for quick and fast integration
• Can be flashed with custom ESP8266 firmware
• GPIO0 controls boot and flashing modes
• Requires a stable 3.3 V power supply capable of handling high peak currents
Applications
• IoT sensor nodes
• Smart home automation
• Wireless data logging
• Remote monitoring systems
• DIY WiFi-enabled embedded projects
Pro Tip
• Use a dedicated 3.3 V regulator with sufficient current (300 mA or higher)
• Always level-shift UART signals when interfacing with 5 V controllers
Package Includes
• 1 × ESP-01 ESP8266 Serial WiFi Wireless Transceiver Module