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ESP-01S

ESP8266 Wi-Fi module, 80MHz, 1MB Flash, 2×GPIO, PCB antenna, 2×8 pin

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Manufacturer Part：

ESP-01S

Package：

Module (14.3×24.8 mm, 2×8 pins, 2.54mm pitch)

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Description

Product Overview

The ESP-01S is a Wi-Fi module based on the Espressif ESP8266EX chip, featuring a complete TCP/IP stack and microcontroller unit in a tiny 2×8 pin form factor. With 802.11 b/g/n Wi-Fi, 32-bit RISC processor at 80 MHz, 1 MB Flash, and full GPIO/SPI/I2C/UART interfaces, it became the breakout module that popularized low-cost IoT development. Packaged as a bare module with onboard PCB antenna.

Key Specifications

Core Tensilica L106 32-bit RISC
Clock Speed 80 MHz (up to 160 MHz)
Wi-Fi 802.11 b/g/n (2.4 GHz)
Flash Memory 1 MB (8 Mbit) external SPI Flash
SRAM ~50 KB available for user
GPIO 2 usable (GPIO0, GPIO2)
Interfaces UART, SPI, I2C
Supply Voltage 3.0V to 3.6V (3.3V typical)
Current (TX) 170 mA (typical at 3.3V)
Current (Standby) 0.9 mA (deep sleep)
Operating Temperature -40°C to +85°C
Module Size 14.3×24.8 mm, 2×8 pins, 2.54mm pitch

Features

  • Complete Wi-Fi networking subsystem with TCP/IP stack
  • Integrated 32-bit MCU with RTOS support
  • AT firmware for transparent serial-to-Wi-Fi bridge
  • Arduino and NodeMCU Lua programming support
  • STA, AP, and STA+AP operating modes
  • WPA/WPA2 security
  • Ultra-compact 2×8 pin module with PCB antenna
  • Deep sleep mode: 0.9 µA (with RTC)

Applications

  • IoT sensor node with Wi-Fi connectivity
  • Serial-to-Wi-Fi transparent bridge
  • Smart home device wireless control
  • Weather station and remote monitoring
  • Low-cost Wi-Fi add-on for existing MCU designs

The ESP-01S is the iconic Wi-Fi module based on the Espressif ESP8266EX chip, featuring a 32-bit RISC processor, 802.11 b/g/n Wi-Fi, 1 MB Flash, and a complete TCP/IP stack in an ultra-compact 2×8 pin form factor. With AT firmware for serial-to-Wi-Fi bridging and support for Arduino/NodeMCU programming, it revolutionized low-cost IoT development and remains widely used for sensor nodes and smart home applications.

The ESP-01S is built around the ESP8266EX SoC which integrates a Tensilica L106 32-bit RISC processor, Wi-Fi baseband/MAC/RF, and peripheral interfaces. The processor runs an RTOS and the TCP/IP stack, handling all Wi-Fi connection management and data transfer. In AT command mode, an external MCU sends serial AT commands to configure Wi-Fi and send/receive data. In standalone mode, the ESP8266 runs user firmware directly (Arduino, NodeMCU, MicroPython). The onboard PCB antenna radiates at 2.4 GHz. The 1 MB SPI Flash stores firmware and user data. The CH_PD pin must be held HIGH for normal operation, and GPIO0 must be LOW during programming mode.

Pin Name Type Function
1 GND Power Ground
2 TX (GPIO1) I/O UART transmit / GPIO1
3 GPIO2 I/O General-purpose I/O (boot mode select)
4 CH_PD Input Chip enable (active-high, connect to VCC via 10kΩ)
5 GPIO0 I/O General-purpose I/O (pull LOW for flash mode)
6 RST Input Reset (active-low)
7 RX (GPIO3) I/O UART receive / GPIO3
8 VCC Power 3.3V supply (3.0-3.6V, must supply 300mA+)
  • IoT sensor node with Wi-Fi data upload to cloud platforms
  • Serial-to-Wi-Fi transparent bridge for existing MCU designs
  • Smart home device wireless control via MQTT or HTTP
  • Weather station and environmental monitoring with remote access
  • Low-cost Wi-Fi add-on module for Arduino and other MCU projects
Manufacturer Part Number Package Notes
Espressif ESP-12E Module (16 pins) More GPIO, external antenna, popular version
Espressif ESP-12F Module (16 pins) Improved antenna design over ESP-12E
Espressif ESP32-WROOM-32D Module Dual-core, BT+Wi-Fi, next generation
Espressif ESP8285 QFN-32 1MB internal Flash, single-chip solution
AI-Thinker ESP-07S Module (16 pins) External antenna connector, ceramic antenna
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