ESP8266 ESP-01S WiFi Serial Transceiver Module

The ESP-01S is an upgraded version of the original ESP-01 module, built around the ESP8266EX chip from Espressif. It's a compact, low-cost WiFi module that adds wireless networking to any microcontroller project with minimal extra hardware.
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The ESP-01S is an upgraded version of the original ESP-01 module, built around the ESP8266EX chip from Espressif. It's a compact, low-cost WiFi module that adds wireless networking to any microcontroller project with minimal extra hardware.

Unlike the original ESP-01, the ESP-01S includes an improved onboard power management circuit, giving it more stable operation — particularly useful when connecting via USB-to-serial adapters that can't always supply clean, sufficient current. It also adds a blue status LED on GPIO2 for quick visual feedback during flashing or operation.

The module ships pre-programmed with AT command firmware, so it can be connected straight to an Arduino (or any 3.3V-tolerant microcontroller) via UART and controlled with simple serial commands — no additional firmware flashing required for basic use. For more advanced projects, it's also fully compatible with the Arduino IDE and NodeMCU/Lua firmware for custom programming.

Key Specifications:

  • Chip: ESP8266EX (Tensilica L106 32-bit low-power MCU)
  • WiFi: 802.11 b/g/n, 2.4GHz
  • Flash memory: 1MB
  • Operating voltage: 3.3V (do not connect to 5V)
  • I/O voltage tolerance: 3.6V max
  • Serial interface: UART (default baud rate 115200 bps; some firmware versions use 9600)
  • Onboard status LED (GPIO2)
  • Pin count: 8-pin (VCC, GND, TX, RX, CH_PD/EN, RST, GPIO0, GPIO2)

 

Typical uses:

  • Adding WiFi connectivity to Arduino or other microcontroller projects
  • IoT sensor nodes and remote monitoring
  • Basic home automation and smart switches
  • Low-cost prototyping before moving to a full ESP32/ESP8266 dev board

 

Note: The ESP-01S operates at 3.3V logic and is not 5V tolerant — a logic level shifter or direct 3.3V microcontroller connection is required when interfacing with 5V boards like a standard Arduino Uno. A separate USB-to-serial programmer (e.g. an ESP-01/ESP-01S USB adapter) is recommended for flashing custom firmware. We also stock a breadboard adapter for use in your projects.

What's in the box?

1 x ESP8266 ESP-01S WiFi Serial Transceiver Module

Respurces

Instructables.com offer some help on this board as well as on medium.com

  • Availability: Out of Stock
  • Model: ESP8266 ESP-01S
  • Brand: Generic1