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IR Object Detection

living with the lab. 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. . IR Object Detection. IR receiver.

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IR Object Detection

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  1. living with the lab 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. IR Object Detection IR receiver IR light reflected off object IR LED IR light from LED

  2. living with the lab The Parts Panasonic PNA4602Msupply voltage: 4.8V – 5.2V current: 3mA IR LED (not your usual LED)outputs 940 nm wavelength light This sensor detects infrared (IR) light. However, to avoid detecting the IR component of regular sunlight or light from other stray IR sources, the sensor only looks for light coming in 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 PNA4602M.

  3. living with the lab IR Light IR detector is most sensitive around 950 nm or 0.95(10)-6 m Panasonic documentation for PNA4602M wikipedia.org

  4. living with the lab Install an LED Shield It is important to install the LED in an enclosure to properly direct the IR light. Your kit includes the black pieces shown. Insert the legs of the LED through the holes in the longer black cylinder, and then install the smaller top piece over the exposed end of the LED. If you don’t have a shield, a piece of paper can be rolled up and taped around the LED. Your LED will look like this after shielding.

  5. living with the lab IR Receiver Circuit LED Circuit 5V from digital outputpin on Arduino 220Ω 220Ω to digital input pin on Arduino Be sure to aim your LED and IR detector so that they have a clear view (nothing in the way)

  6. living with the lab Arduino Sketch void setup() { Serial.begin(9600); // allows output to display pinMode(2, OUTPUT); // define digital pin 2 as an output (output to LED) pinMode(3, INPUT); // define digital pin 3 as an input (input from sensor) } void loop() { tone(2,38000); // output a LOW HIGH LOW sequence at 38,000 Hz intIR_status= digitalRead(3); // acquire the status of the IR sensor Serial.println(IR_status); // display the status of the IR sensor delay(100); // wait 100ms between sensor queries } nothing is detected by IR sensor something is detected by IR sensor

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