Sharp Infrared Distance Sensor 2Y0A21

This Sharp infrared distance sensor measures distances from 10 to 80 cm. The small design and short measuring time suit robot projects that need to avoid obstacles. The analog output can be read directly with an Arduino; the voltage falls non-linearly from around 2.3 V at 10 cm to around 0.4 V at 80 cm.

Recommended alternative for 20 to 150 cm: Sharp Infrared Distance Sensor 20-150cm GP2Y0A02

Recommended Accessories:

• Electrolytic Capacitor Set 120 Pieces assorted

Features:

• Distance from the analog value: distance (cm) = (3027.4 / analog value)^1.2134, calibrate with a comparison measurement for accurate values
• Below 10 cm the measurement is ambiguous: closer objects deliver the same voltage as more distant ones
• According to the datasheet, a capacitor of 10 µF or more belongs between Vcc and GND; this reduces noise
• Arduino library SharpIR, model 1080

Application Examples:

• Obstacle detection for robots
• Contactless distance measurement

Documentation:

• GP2Y0A21YK0F tutorial with Arduino (Makerguides)
• Sharp 2Y0A21 datasheet (PDF)

Technical Data:

• Model: GP2Y0A21YK0F (marked 2Y0A21)
• Measuring range: 10 to 80 cm
• Supply voltage: 4.5 to 5.5 V
• Operating current: approx. 30 mA
• Analog output: non-linear to distance
• Time per measurement: 38.3 ms ± 9.6 ms
• Cable: red +5 V, black GND, yellow analog voltage
• Cable length: 20 cm
• Dimensions: 29.5 × 13 × 13.5 mm
• Mounting holes: 2× 3.2 mm, spacing 37 mm
• Weight: 8 g

Scope of Delivery:

• 1× Sharp infrared distance sensor 2Y0A21
• 1× Connection cable