How to Use TB8266: Examples, Pinouts, and Specs

The TB8266 is a low-power Wi-Fi module designed specifically for Internet of Things (IoT) applications. It features a compact design and an integrated TCP/IP stack, making it an ideal choice for projects requiring seamless connectivity to Wi-Fi networks. The module is versatile and can be used in a wide range of applications, including smart home devices, industrial automation, and wireless sensor networks.

• Smart home devices (e.g., smart plugs, thermostats)
• Industrial IoT systems
• Wireless sensor networks
• Remote monitoring and control systems
• Wearable devices with Wi-Fi connectivity

• Wi-Fi Standard: IEEE 802.11 b/g/n
• Operating Voltage: 3.3V DC
• Current Consumption:
  • Idle: ~10mA
  • Active (transmitting): ~200mA
• Operating Frequency: 2.4 GHz
• Data Rate: Up to 72.2 Mbps
• Integrated Features: TCP/IP stack, Wi-Fi Direct (P2P), and SoftAP
• Operating Temperature: -40°C to 85°C
• Dimensions: 18mm x 20mm x 3mm

The TB8266 module has 8 pins, as described in the table below:

1. Power Supply: Connect the VCC pin to a stable 3.3V DC power source and the GND pin to ground.
2. Serial Communication: Use the TX and RX pins to interface with a microcontroller or computer via UART. Ensure the baud rate matches the module's default (typically 115200 bps).
3. GPIO Pins: Configure GPIO0 and GPIO2 as needed for your application. These pins can be used for input, output, or special functions.
4. Enable and Reset:
   • Pull the EN pin high to enable the module.
   • To reset the module, momentarily pull the RST pin low.

• Voltage Levels: The TB8266 operates at 3.3V. Avoid connecting it directly to 5V logic without a level shifter.
• Antenna Placement: Ensure the module's antenna area is free from obstructions for optimal Wi-Fi performance.
• Power Supply: Use a low-noise, stable power source to prevent communication issues.

Below is an example of how to connect the TB8266 to an Arduino UNO and send data over Wi-Fi.

• TB8266 VCC → 3.3V pin on Arduino
• TB8266 GND → GND pin on Arduino
• TB8266 TX → Arduino RX (via a voltage divider to step down 5V to 3.3V)
• TB8266 RX → Arduino TX
• TB8266 EN → 3.3V
• TB8266 RST → Connect to a push button for manual reset

#include <SoftwareSerial.h>

// Define RX and TX pins for SoftwareSerial
SoftwareSerial tb8266(10, 11); // RX = Pin 10, TX = Pin 11

void setup() {
  Serial.begin(9600); // Start Serial Monitor communication
  tb8266.begin(115200); // Start TB8266 communication

  // Send initialization commands to TB8266
  tb8266.println("AT"); // Test communication with the module
  delay(1000); // Wait for response

  tb8266.println("AT+CWMODE=1"); // Set module to Station mode
  delay(1000);

  tb8266.println("AT+CWJAP=\"YourSSID\",\"YourPassword\""); 
  // Connect to Wi-Fi network
  delay(5000); // Allow time for connection
}

void loop() {
  if (tb8266.available()) {
    // Read data from TB8266 and print to Serial Monitor
    Serial.write(tb8266.read());
  }

  if (Serial.available()) {
    // Send data from Serial Monitor to TB8266
    tb8266.write(Serial.read());
  }
}

• Replace "YourSSID" and "YourPassword" with your Wi-Fi network credentials.
• Use a voltage divider or logic level shifter for the TX pin to avoid damaging the module.

1. No Response from the Module

   • Ensure the module is powered correctly (3.3V) and the EN pin is high.
   • Check the UART connections and baud rate settings.

2. Wi-Fi Connection Fails

   • Verify the SSID and password are correct.
   • Ensure the Wi-Fi network is within range and supports 2.4 GHz.

3. Unstable Communication

   • Use a decoupling capacitor (e.g., 10µF) near the VCC pin to stabilize the power supply.
   • Check for electromagnetic interference near the module.

• Reset the Module: If the module becomes unresponsive, pull the RST pin low momentarily to reset it.
• Update Firmware: Ensure the module's firmware is up to date for optimal performance.
• Debugging: Use an external USB-to-Serial adapter to directly communicate with the module for debugging.

By following this documentation, you can effectively integrate the TB8266 into your IoT projects and troubleshoot common issues with ease.