SKU: IOWC-0056
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AI-Thinker ESP-01S ESP8266 WiFi Module

₹185.00 (Inclusive of all taxes)
Out of Stock

The AI-Thinker ESP-01S is a compact ESP8266EX-based WiFi module pre-flashed with AT command firmware, providing a 3.3V UART interface for easy integration of Wi-Fi connectivity into microcontroller projects like Arduino and Raspberry Pi.

Features

  • Powered by the ESP8266EX SoC with integrated TCP/IP stack for standalone Wi-Fi networking.
  • Pre-programmed with AT command firmware for out-of-the-box UART-based Wi-Fi control (AP/STA/AP+STA modes).
  • Compact form factor with 1MB flash memory, four primary interface pins (VCC, GND, TXD, RXD), and two usable GPIOs.
  • Operates on a 3.0-3.6V supply with a wide -20°C to 85°C temperature range for robust deployment.
  • Extremely cost-effective entry point for adding 2.4GHz Wi-Fi (2412-2484 MHz) to IoT sensors and automation devices.

Out of stock

Description

The ESP-01S module from AI-Thinker encapsulates the full capabilities of the ESP8266EX system-on-chip into a minimal-footprint board. It functions as a self-contained SOC with an integrated LWIP TCP/IP stack, capable of hosting an application or offloading all Wi-Fi networking functions from a primary host microcontroller via simple serial AT commands.

Designed for cost-effective IoT integration, its high on-chip integration minimizes external RF circuitry requirements. The module supports advanced features like APSD for VoIP and Bluetooth co-existence interfaces, backed by a self-calibrated RF system that ensures stable operation across varying environmental conditions.

Key Features

  • ESP8266EX SoC with integrated 32-bit Tensilica processor and Wi-Fi MAC/BB/RF/PA/LNA.
  • Pre-flashed AT command firmware for immediate UART-based Wi-Fi configuration and control.
  • Supports Wi-Fi modes: Access Point (AP), Station (STA), and concurrent AP+STA.
  • Compact design with four primary interface pins (3.3V VCC, GND, TX, RX) and two additional GPIO pins for sensor or control interfacing.
  • Internal LWIP stack enables full TCP/IP networking capabilities for IoT applications.
  • Self-calibrated RF circuitry ensures reliable performance without external RF components.
  • Ideal for low-cost, high-volume Wi-Fi integration in smart home devices and telemetry sensors.

Applications

  • Smart home automation relays and switches.
  • Wi-Fi sensor nodes for environmental monitoring (temperature, humidity).
  • IoT prototyping bridges for Arduino and other microcontrollers.
  • Low-cost consumer device connectivity for data logging and remote control.
  • Educational tools for learning embedded Wi-Fi and IoT networking.

Technical Specifications

Microcontroller/SoCESP8266EX
Wireless ProtocolIEEE 802.11 b/g/n Wi-Fi
Frequency Range2412 - 2484 MHz (2.4 GHz)
Flash Memory1 MB (8 Mbit)
Supply Voltage3.0 - 3.6 V DC
Operating Current> 300 mA (peak during RF transmission)
InterfacesUART, GPIO (2 pins available)
AntennaIntegrated PCB antenna
Operating Temperature-20°C to +85°C
DimensionsApprox. 24.75mm x 14.5mm (module)

Frequently Asked Questions

How do I power and communicate with the ESP-01S module?

Connect a stable 3.3V DC power supply to the VCC and GND pins. Use a USB-to-serial adapter or microcontroller UART set to 3.3V logic levels to connect TXD and RXD pins for communication. The default baud rate for AT commands is typically 115200. Ensure your serial adapter provides adequate current, as the module can draw over 300mA during RF transmission. Always use a common ground between the power source and the serial interface.

Can I reprogram the ESP-01S with custom firmware like Arduino code?

Yes, but it requires entering the flash mode. To flash new firmware, you must connect GPIO0 to GND during power-up and use a serial programmer tool. You can then upload code via the Arduino IDE using a board definition like "Generic ESP8266 Module." Note that the module has limited GPIOs (GPIO0 and GPIO2 are exposed) and 1MB of flash, which constrains complex projects. The AT command firmware can be overwritten, so backup the original binaries if needed.

What are the primary differences between the ESP-01 and ESP-01S?

The ESP-01S is an improved version featuring a more stable power circuit with additional filtering capacitors, which reduces brownout resets. It typically uses the ESP8266EX chip and has a fixed, integrated PCB antenna, whereas older ESP-01 versions sometimes had a connector for an external antenna. The ESP-01S also generally has more reliable flash memory. Both share the same pinout and core functionality, but the 'S' variant is recommended for new designs due to its enhanced power integrity.

Package Includes

  • 1 x AI-Thinker ESP-01S ESP8266 WiFi Module

Additional Information

Weight 0.03 kg
Dimensions 8 × 5 × 1 cm