The Sharp GP2Y0A02YK0F is a long-range optical distance sensor that measures distances from 20 cm to 150 cm (8″ to 60″). It utilizes an integrated combination of an infrared emitting diode (IRED), a position-sensitive detector (PSD), and a signal processing circuit to calculate distance through triangulation. Because it uses the triangulation method, its readings are minimally affected by the object’s reflectivity, operating temperature, or duration of operation.Technical Specifications

• Operating Voltage: 4.5 V to 5.5 V
• Average Current Consumption: 33 mA typical (Note: It draws current in large, short bursts)
• Output Type: Analog voltage (0.4 V at 150 cm up to approximately 2.8 V at 20 cm)
• Response/Update Time: 38 10 ms
• Dimensions: 29.5 13.0 21.6 mm

Pinout and ConnectionThe sensor features a 3-pin JST PH connector interface. Looking at the back of the sensor case, the pins typically align as follows:

1. VCC: Connect to +5V power source.
2. GND: Connect to system ground.
3. Vo (Output): Connect to an Analog Input pin on your microcontroller (e.g., Arduino A0).

Hardware Tip: Because the sensor draws current in massive, quick spikes during its internal IR pulses, the manufacturer strongly recommends placing a 10 F or larger bypass capacitor across the VCC and GND lines close to the sensor. This stabilizes the power supply line and eliminates noise spikes in your readings.

Non-Linear Output BehaviorThe output voltage of this sensor is non-linear and inversely proportional to the distance.

• If an object gets closer than 20 cm, the voltage curve drops back down. A distance of 10 cm might look exactly like 80 cm to the microcontroller. Ensure your project keeps obstacles at least 20 cm away.
• Linearizing Data: To map voltage to an actual distance in centimeters, you cannot use a simple linear function like Arduino’s map(). The relationship is roughly linear when relating the output voltage (V) to the inverse of the distance (1/Distance)