ESP8266 WiFi Module (ESP-01S)

The ESP8266 01S is a low-cost WiFi module that allows microcontrollers to connect to a WiFi network and make simple TCP/IP connections using Hayes-style commands. It is an improved version of the popular ESP8266-01 module, featuring better stability and performance. The module is ideal for IoT (Internet of Things) applications, enabling devices to communicate wirelessly with the internet or local network.

Key Features:

• Integrated TCP/IP protocol stack
• WiFi 802.11 b/g/n support
• Built-in low-power 32-bit CPU, can also function as an application processor
• 1MB of Flash memory
• Supports AP (Access Point), STA (Station), and AP+STA modes
• UART interface for easy integration
• Wide range of GPIOs for connecting sensors and peripherals
• Compact and lightweight design

Technical Specifications:     

• Microcontroller: Tensilica L106 32-bit RISC processor, running at 80 MHz
• Operating Voltage: 3.0V to 3.6V
• Flash Memory: 1MB
• RAM: 50 kB
• WiFi Standards: 802.11 b/g/n
• Frequency Range: 2.4 GHz to 2.5 GHz
• Data Rate: Up to 1 Mbps
• UART Baud Rate: 9600 bps (default)
• GPIO Pins: 2 (GPIO0 and GPIO2)
• Operating Current: 70 mA (typical)
• Deep Sleep Current: < 10 µA
• Operating Temperature: -40°C to +125°C
• Dimensions: 25mm x 15mm x 6mm

Applications:

• Internet of Things (IoT) devices
• Home automation
• Wireless sensor networks
• Remote data logging
• Smart appliances
• Wearable technology
• DIY electronics projects

Usage:

1. Connection:
   • Connect the VCC pin to a 3.3V power supply and GND to ground.
   • Connect the TX and RX pins to the UART interface of the microcontroller (with proper voltage level shifting if necessary).
   • Use GPIO0 and GPIO2 for additional control and sensor connections.
2. Programming:
   • Use AT commands to configure and control the module via a serial interface.
   • Optionally, use the Arduino IDE or other compatible development environments to write custom firmware for the ESP8266.
3. WiFi Configuration:
   • Configure the WiFi settings (SSID and password) using AT commands or custom firmware.
   • Establish TCP/IP connections for data communication with remote servers or local networks.

AT Command Set

//cdn.sparkfun.com/datasheets/Wireless/WiFi/Command%20Doc.pdf