Notice that the output voltage of an object that is 2 cm away is the same as the output voltage for an object that is 28 cm away. The graph also shows why the usable detection range starts at 10 cm. From the datasheet, you can see that the output voltage of the SHARP GP2Y0A21YK0F ranges from 2.3 V when an object is 10 cm away to 0.4 V when an object is 80 cm away. IR distance sensors output an analog signal, which changes depending on the distance between the sensor and an object.
It outputs an analog signal which depends on the position of the object in front of the sensor. This circuit processes the position of the optical spot on the PSD to determine the position (distance) of the reflective object. The sensor has a built-in signal processing circuit. Note the change in the angle of the reflected beam and the position of the ‘optical spot’ on the PSD. See point A and point B in the image below. When the position of the object changes, the angle of the reflected beam and the position of the spot on the PSD changes as well. When the beam of light gets reflected by an object, the reflected beam will reach the light detector and an ‘optical spot’ will form on the PSD. The sensor consists of an IR LED and a light detector or PSD (Position Sensing Device). The distance is calculated using triangulation of the beam of light. As an Amazon Associate we earn from qualifying purchases.Īn IR distance sensor uses a beam of infrared light to reflect off an object to measure its distance. is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to products on. How to use a SHARP GP2Y0A710K0F IR Distance Sensor with Arduino.Waterproof JSN-SR04T Ultrasonic Distance Sensor with Arduino Tutorial.How to use an HC-SR04 Ultrasonic Distance Sensor with Arduino.Example code for SHARP GP2Y0A21YK0F IR distance sensor with Arduino.Wiring – Connecting GP2Y0A21YK0F IR sensor to Arduino.
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