Example Code for Arduino-Black and White Line Detection

Hardware Preparation

• DFRduino UNO R3 (or similar) x 1
• USB to Serial Cable x 1
• Jumper wires

Software Preparation

• Arduino IDE
• Click to download DFRobot TF Mini Library

Wiring Diagram

Sample Code

The code needs to be used with the TF Mini library.

/*
  * @File  : DFRobot_TFmini_test.ino
  * @Brief : This example use TFmini to measure distance
  *         With initialization completed, we can get distance value and signal strength
  * @Copyright   [DFRobot](https://www.dfrobot.com), 2016
  *             GNU Lesser General Public License
  *
  * @version  V1.0
  * @date  2018-1-10
*/

#include <DFRobot_TFmini.h>

SoftwareSerial mySerial(12, 13); // RX, TX

DFRobot_TFmini  TFmini;
uint16_t distance,strength;

void setup(){
    Serial.begin(115200);
    TFmini.begin(mySerial);
}

void loop(){
    if(TFmini.measure()){                      //Measure Distance and get signal strength     
        strength = TFmini.getStrength();       //Get signal strength data
        Serial.print("Strength = ");
        Serial.println(strength);  
    }
}    

Result

After uploading the program, place white and black paper at the same distance within the sensor¡¯s detection range. The signal strength values will then be displayed in the Serial Plotter interface, allowing you to compare the reflectivity difference between the two colors.