ESP-01 ESP8266 3.3V/5V Serial WiFi Adapter Module

The ESP-01 ESP8266 3.3V/5V Serial WiFi Adapter Module is a dedicated breakout and interface board designed to simplify connecting the popular ESP-01 WiFi transceiver with 5V microcontrollers. Because the ESP8266 chip operates strictly on 3.3V power and logic levels, connecting it directly to a 5V board can permanently damage the module. This adapter solves that problem by integrating an onboard 3.3V LDO voltage regulator and a bi-directional logic level shifting circuit, ensuring safe power delivery and reliable UART serial communication.

Ideal for IoT projects, smart home automation, wireless sensor nodes, and remote telemetry systems, this adapter allows seamless plug-and-play compatibility with Arduino UNO R3, Arduino Mega, Nano, and other 5V or 3.3V development boards. With its clear pinout labels (VCC, GND, TX, RX), standard 2.54mm male header pins, and 2x4 female socket, engineers and makers can quickly prototype wireless applications without complex breadboard wiring or external level converters.

Features:

• Onboard 3.3V LDO Regulator: Steps down 4.5V to 5.5V DC input to a stable 3.3V supply capable of delivering up to 240mA for reliable WiFi transmission.
• Integrated Logic Level Shifter: Converts 5V UART TX/RX signals to 3.3V logic levels, protecting the ESP-01 module from overvoltage damage.
• Direct Socket Mounting: Features a dedicated 2x4 pin (8-pin) female header socket for solderless, plug-and-play insertion of the ESP-01 or ESP-01S module.
• Arduino UNO R3 Ready: Breaks out VCC, GND, TX, and RX onto standard 2.54mm pitch male pins for effortless jumper wire or breadboard connections.
• Dual Logic Compatibility: Works seamlessly with both 3.3V and 5V microcontroller platforms including Arduino, AVR, PIC, and STM32.
• Compact & Lightweight PCB: Measures just 47.5mm x 24mm x 11.5mm with four corner mounting holes for secure enclosure integration.

Package Includes:

1 x ESP-01 ESP8266 3.3V/5V Serial WiFi Adapter Module