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.