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Reflectance Sensors TYWu
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Photo Interrupter ON1120 ON1120 is a photocoupler in which a high efficiency GaAs infrared light emitting diode is used as the light emitting element, and a high sensitivity phototransistor is used as the light detecting element. The two elements are arranged so as to face each other, and objects passing between them are detected.
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Photo Interrupter Features Fast response : tr, tf = 6 μs (typ.)
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Photo Interrupter Package Dimension and Circuit Mark Label Bottom View
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OS25B10 Application Circuit and Waveforms
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OS25B10 Application Tape-end sensors Edge sensors
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My Experiment Placement a1 GND Arduino Pin 2 GND 5V or 3.3V Necessary
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Discussion GaAs infrared light emitting diode is easy to be destroyed by high voltage!
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Arduino Code int sensorPin = 2; boolean sensorState = false;
void setup() { Serial.begin(9600); pinMode(sensorPin, INPUT); digitalWrite(sensorPin, HIGH); // Pull High }
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Arduino Code (Cont’d) void loop() {
if((digitalRead(sensorPin) == LOW) && !sensorState) { sensorState = true; Serial.println("Object Gone"); } else if((digitalRead(sensorPin) == HIGH) && sensorState) { sensorState = false; Serial.println("Object Present");
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Execution Snapshot
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Photo Reflective Sensor
This is a reflective sensor combines a GaA1As infrared light emitting diode with a high sensitive Darlington phototransistor in a mini package.
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Photo Reflective Sensor
Package Dimension and Circuit
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Photo Reflective Sensor
Applications Edge sensors Level sensors of liquid
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QTR-1A Reflectance Sensor
Sold by Pololu
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QTR-1A Reflectance Sensor
Function
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