Photosensor- Short Range
Introduction¶
The reflectivity of infrared light varies with the color and distance of the reflecting surface, According to this principle,Photosensor- Short Range utilizes a TCRT5000 reflective photosensor module to detect color and distance. When a light-colored object approaches,the signal intensity received by infrared reflective sensor increases and the indicator LED on board turns ON. When a dark-colored object approaches, the intensity decreases and the LED turns off. This sensor is a basic and widely used part in applications such as line-following cars, rotary speed detection, auto data logging on utility meters or other situations where color or distance contrast is sharp.
There is also a long range version Photosensor for you to choose.
SLS01013S
Features¶
- Operating voltage: 4.5 V - 5.5 V.
- Digital output, 0 or VCC.
- High resolution sensor;minumum detectable length: 1mm black line.
- Effective distanceļ¼1-8mm,optimum:2.5mm.
- Indicator LED on board.
- Size:35*7.5*5mm.
- Easy to use in obstacle sensoring; White/Black wire tracking
Usage¶
There is a infrared emitter and a receiver on this module, the emitter always emit infrared ray. When the infrared light emitted by the emitter gets reflected on a surface that blocked it, the phototransistor can pick up the signal. with this way, this module can be used to detect if there is a obstacle in the measuring range. It can be also use to do White/Black wire tracking because the black wire absorb the rays while the white wire reflect the rays.
Hardware¶
Connect the Photosensor to your Arduino/Crowduino power supply pin and digital pins. You can can connect the "s" terminal to any of your arduino Pins,like the "D6" as belows: 
Programming¶
1.Copy the following program to Arduino IDE and upload to your Arduino/Crowduino:
void setup() {
Serial.begin(9600);
pinMode(6,INPUT);
}
void loop() {
while(1) {
delay(500);
if(digitalRead(6)==HIGH) {
Serial.println("Somebody is here.");
}
else {
Serial.println("Nobody.");
}
}
}
2.Open the Serial moniter , and set the baudrate to 9600, you will see that When somebody is in front of the sensor , the Serial Monitor will output "Somebody is here.".Or, the Serial Monitor output "Nobody."
