1. IR Object Detection IR detector IR LED IR light reflected off object
IR light from LED
IR light reflected off object
IR LED
IR detector

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3. How it works The Components
Infrared (IR) light leaving an LED reflects off an object.
The reflected light travels back to an IR receiver.
The IR receiver “detects” the presence of the object.
The object does not need to move to be detected.
The Components
Vishay TSSP58038 supply voltage: 2.7V to 5.5V
current: 0.7mA
IR LED (not your usual LED) outputs 940 nm wavelength light
This sensor detects infrared (IR) light. To avoid detecting the IR component of regular sunlight, the sensor looks for light blinking at 38 kHz.
We write an Arduino sketch to make this LED flash 38,000 times per second so it can be detected by the photoresistor.

4. IR Light IR detector is most sensitive around 950 nm or 0.95(10)-6 m
Vishay documentation for TSSP58038

5. LED Circuit IR Receiver Circuit 220Ω digital I/O pin 8 5V
Aim your LED and IR detector so that they have a clear view (nothing in the way)

6. Wrap IR LED with tape to shield it from detector
If detector can “see” the LED, it will think that an object is detected.

7. Arduino Sketch nothing is detected by IR sensor
something is detected by IR sensor
void setup() {
pinMode(7, INPUT);
Serial.begin(9600);
tone(8,38000); }
void loop() {
int detect=digitalRead(7);
Serial.println(detect);
creates a square wave through pin 8 with a frequency of 38,000 hertz
(the tone command keeps working until a notone(8)is called)

8. Can you think of possible ways to change the distance at which an object is detected?
LED Circuit
220Ω
digital I/O pin 8
HINT: Is there something you could change in the circuit above?