Close-up of ShillehTek ESP8266 ESP-01 Serial WiFi Module with gold antenna pattern

ESP8266 ESP-01 Serial WiFi Module 1MB Wireless Transceiver for IoT

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ESP8266 ESP-01 1MB WiFi module with 1MB flash, ideal for hosting simple web servers as a standalone microcontroller for compact IoT projects.

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Overview

Product Overview

The ESP8266 ESP-01 is a compact Wi‑Fi transceiver and self-contained networking module that gives microcontrollers internet access or can run simple web servers and automation tasks on its own, thanks to a 32‑bit Tensilica L106 processor. This 1MB model provides expanded storage for libraries and supports OTA firmware updates, while the integrated TCP/IP stack and preloaded firmware simplify sending GET/POST requests or connecting to MQTT brokers for data logging. Control and flashing are handled over a standard Serial UART interface (RX/TX) using AT commands or a USB‑TTL adapter, and built‑in deep sleep modes drop consumption to micro‑amps for battery‑powered sensor projects. Practical, small, and proven for IoT prototyping and lightweight standalone applications.

Questions & answers

Frequently asked questions

Yes. It can add Wi-Fi to Arduino, Raspberry Pi, ESP32, and other microcontroller projects through a Serial UART connection. The host typically controls it with AT commands or custom firmware over RX and TX.
The module includes preloaded firmware for basic Wi-Fi networking, so it can be controlled with AT commands over UART. To change firmware or program it directly, use a compatible USB-TTL serial adapter.
The ESP-01 is a 3.3V Wi-Fi module and communicates through standard UART RX/TX serial pins. Do not connect its serial or power pins directly to 5V logic without proper level shifting or regulation.
Yes. It is commonly used to send sensor readings to MQTT brokers, web servers, or cloud logging endpoints. The integrated TCP/IP stack supports lightweight IoT tasks such as GET/POST requests and simple automation control.
The 1MB flash version provides more storage than smaller ESP-01 variants for libraries and firmware features, and this model supports OTA firmware updates. Confirm your firmware build and memory layout match a 1MB ESP-01 module.

Have other questions?

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What's included

Features & Specs

32-bit Processor Runs a 32-bit Tensilica L106 core for standalone IoT applications.

1MB Flash Memory Includes 1MB onboard flash to store firmware and larger libraries.

Built-in Wi-Fi Provides 802.11 b/g/n wireless connectivity for internet access.

Integrated TCP/IP Ships with a TCP/IP stack to simplify HTTP and MQTT communications.

Serial UART Interface Uses standard RX/TX pins for easy AT-command control or microcontroller linking.

Deep Sleep Power Supports deep sleep modes to minimize current draw for battery projects.

OTA & MQTT Support Allows over-the-air firmware updates and connects to MQTT brokers for telemetry.

Reference

Documents

Full Product Manual ShillehTek ESP8266 ESP-01 Serial WiFi Module 1MB Wireless Transceiver IoT | ShillehTek Product Manual In-depth setup guide with wiring, code examples, and troubleshooting.

Datasheet

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