How to Use tfmini-s: Examples, Pinouts, and Specs

The TFmini-S is a compact, high-precision LiDAR distance sensor designed for accurate distance measurements in a variety of applications. With a measurement range of up to 12 meters and a small form factor, the TFmini-S is ideal for robotics, drones, and other embedded systems requiring reliable distance sensing. Its simple serial interface ensures easy integration into projects, making it a versatile choice for both hobbyists and professionals.

• Obstacle detection in robotics
• Altitude measurement for drones
• Distance sensing in industrial automation
• Smart home devices and security systems
• Educational and research projects

The TFmini-S offers robust performance in a compact package. Below are its key technical details:

The TFmini-S has a 4-pin interface for power and communication. The pinout is as follows:

To use the TFmini-S with an Arduino UNO, follow these steps:

1. Wiring:

   • Connect the VCC pin of the TFmini-S to the 5V pin on the Arduino.
   • Connect the GND pin of the TFmini-S to the GND pin on the Arduino.
   • Connect the TX pin of the TFmini-S to the Arduino's D2 pin (for software serial).
   • Connect the RX pin of the TFmini-S to the Arduino's D3 pin (for software serial).

2. Install Required Libraries:

   • Install the SoftwareSerial library (pre-installed with the Arduino IDE).

3. Arduino Code: Use the following example code to read distance data from the TFmini-S:

   #include <SoftwareSerial.h>
   
   // Define software serial pins for TFmini-S
   SoftwareSerial tfminiSerial(2, 3); // RX, TX
   
   void setup() {
     Serial.begin(9600); // Initialize serial monitor
     tfminiSerial.begin(115200); // Initialize TFmini-S serial communication
     Serial.println("TFmini-S Distance Sensor Initialized");
   }
   
   void loop() {
     if (tfminiSerial.available()) {
       uint8_t data[9];
       if (tfminiSerial.read() == 0x59) { // Check for frame header
         if (tfminiSerial.read() == 0x59) { // Check for second frame header
           for (int i = 0; i < 7; i++) {
             data[i] = tfminiSerial.read(); // Read remaining data bytes
           }
           uint16_t distance = data[0] + (data[1] << 8); // Calculate distance
           uint16_t strength = data[2] + (data[3] << 8); // Signal strength
           Serial.print("Distance: ");
           Serial.print(distance);
           Serial.print(" cm, Strength: ");
           Serial.println(strength);
         }
       }
     }
   }
   

• Power Supply: Ensure a stable 5V power supply to avoid measurement errors.
• Baud Rate: The default UART baud rate is 115200. Ensure your microcontroller matches this setting.
• Signal Strength: Low signal strength may indicate poor reflectivity of the target or excessive ambient light.

1. No Data Output:

   • Cause: Incorrect wiring or baud rate mismatch.
   • Solution: Double-check the wiring and ensure the Arduino's baud rate matches the TFmini-S.

2. Inaccurate Measurements:

   • Cause: Target surface is too reflective or not reflective enough.
   • Solution: Use a target with moderate reflectivity and avoid direct sunlight.

3. Intermittent Data:

   • Cause: Unstable power supply.
   • Solution: Use a regulated 5V power source.

1. Can the TFmini-S be used outdoors?

   • Yes, but performance may be affected by direct sunlight or extreme temperatures.

2. How do I switch between UART and I2C modes?

   • The TFmini-S supports mode switching via specific commands. Refer to the manufacturer's datasheet for details.

3. What is the maximum frame rate?

   • The TFmini-S supports frame rates up to 1000 Hz, configurable via commands.

By following this documentation, you can effectively integrate the TFmini-S into your projects and troubleshoot common issues.