ESP8266-01S Serial WiFi Wireless Module

ESP8266-01S Serial WiFi Wireless Module gives designers a compact and cost-effective way to add WiFi connectivity to embedded projects. Based on the popular ESP8266 chipset, this module integrates TCP/IP networking and offers serial communication, making it a favorite for IoT prototypes, smart devices, and wireless controllers.

Key Features:

• Built-in WiFi Support: Fully integrates 802.11 b/g/n protocol with soft-AP and station modes.
• Serial UART Interface: Communicates easily with microcontrollers using AT commands.
• Low Power Consumption: Includes sleep and deep-sleep modes for energy-efficient designs.
• Integrated TCP/IP Stack: Handles networking protocols internally, reducing host MCU load.
• Compact Design: Small footprint suits space-constrained IoT projects.
• Firmware Upgradability: Supports OTA and serial firmware updates.

Technical Specifications:

• Chipset: ESP8266EX
• Operating Voltage: 3.0 V – 3.6 V (typical 3.3 V)
• Operating Current: ~70 mA average, peaks up to 200 mA during TX
• WiFi Standards: IEEE 802.11 b/g/n
• Data Rate: Up to 72.2 Mbps (802.11n)
• Flash Memory: 1 MB (01S variant)
• Interface: UART (default baud rate 115200 bps)
• Security: WEP, WPA/WPA2, WPA2-PSK, WPS
• Operating Temperature: −40 °C to +125 °C

Mechanical Specifications:

• Module Type: ESP-01S with PCB antenna
• Connector: 2×4 2.54 mm pitch header pins
• Mounting: Compatible with breadboards and standard pin sockets
• Enclosure: Open-frame module, not conformal coated

Dimensions:

• Length: ~24.8 mm
• Width: ~14.3 mm
• Height: ~3 mm (excluding header pins)
• Pin Pitch: 2.54 mm standard

Pinout and Wiring:

• VCC: Power input, 3.3 V regulated supply only (do not connect 5 V)
• GND: Ground
• TX: UART Transmit (3.3 V logic)
• RX: UART Receive (3.3 V logic, level shift if using 5 V MCU)
• CH_PD/EN: Chip enable, tie to 3.3 V for normal operation
• GPIO0: Used for normal boot (pull high) or flashing (pull low)
• GPIO2: General-purpose I/O (pull high for boot)
• RST: Reset pin, active low
• Wiring Note: Use a regulated 3.3 V power supply with at least 500 mA capacity for stable WiFi operation.

Datasheet Reference:

• Refer to Espressif’s official ESP8266EX datasheet and the ESP-01S module documentation for detailed electrical and timing characteristics.

Applications:

• IoT Devices: Add WiFi connectivity to sensors, controllers, and automation projects.
• Smart Home: Use in switches, lighting controllers, and wireless appliances.
• Wireless Data Logging: Transmit sensor readings to cloud services or local servers.
• DIY Projects: Integrate into hobby electronics, robotics, and Arduino-based systems.

Equivalent Models:

• ESP-01: Earlier version with similar footprint but lower flash size
• ESP-12E/F: Larger ESP8266 modules with more GPIO and external antenna options
• ESP32-C3 Mini: Newer generation module with Bluetooth LE and more processing power

Package Includes:

• 1 x ESP8266-01S Serial WiFi Wireless Module