ESP-01S WiFi Module

Overview

The ESP-01S WiFi Module is a miniature, highly integrated WiFi transceiver based on the ESP8266 chip. It combines a full TCP/IP stack, RF front-end, and MCU core, allowing you to add WiFi connectivity to your projects with minimal external components. The module supports multiple operational modes (station, access point, or both), and is well suited for IoT, automation, and wireless control applications.

Key Features

• Supports 802.11 b/g/n WiFi standard

• Integrated TCP/IP protocol stack for direct networking

• Operating frequency: ~2.4 GHz

• On-board MCU with memory (flash) for hosting firmware or AT commands

• Multiple interfaces: UART, GPIOs (e.g., TX/RX, CH_PD, RST, GPIO0, GPIO2)

• Low power consumption in sleep / standby modes

• Improved stability and internal pull-up resistors compared to older ESP-01 modules

Typical Applications

• IoT sensor nodes & data loggers

• Remote control / home automation

• Embedded WiFi in microcontroller projects

• Wireless communication gateways

• Prototyping WiFi-enabled devices

Suggested Specifications 

• Supply voltage: ~3.0 V to 3.6 V (nominal 3.3 V)

• Average working current: ~80 mA (varies with mode)

• WiFi modes: STA / AP / STA+AP

• UART baud rate range: up to several Mbps (default 115200 bps)

• Operating temperature: –40 °C to +125 °C