TCRT5000 Track Sensor Module

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*Disclaimer: The images are merely illustrative.

Specifications

Electrical Characteristics

Switch and indicator

1. Regulating of threshold voltage:

The threshold voltage is a voltage for comparison. When the sensor encounters obstacles (white surface), and the induced voltage is above the threshold, it will digitally output a high level (3.3V or 5V); when there are no obstacles (black surface), and the induced voltage is below the threshold, it will digitally output a low level (0V). In this way, the digital pin can be used directly to see if the sensor encounters obstacles or not or to follow a black line on a white surface. The threshold voltage can be regulated by simply twisting the potentiometer which is shown in the following diagram, and it increases by rotating to left side and decreases by rotating to right side

2. Status LED

Within certain height, LED lamp will be OFF when obstacles or non-black objects are detected and it will be ON when no obstacles but black objects (compared to the non-black objects under the same height) are detected.

Demo

Connect S port of track sensor to D2 port of Arduino board, and we will use the following program to read the digital value of current status. When objects are detected, a buzzer (not included) connected to output pin 3 will give an alarm.

 const int DSIGNAL = 2;
 const int buzzer= 3;

 void setup() 
 {
 pinMode(DSIGNAL, INPUT);
 }
 void loop() 
 {
 int DsignalState = digitalRead(DSIGNAL);
 if(DsignalState)
 {
 digitalWrite(buzzer,LOW);
 }
 else
 {
 digitalWrite(buzzer,HIGH);
 }  
 }