PololuPololu· Sensors
QTR-HD-31RC Reflectance Sensor Array: 31-Channel, 4mm Pitch, RC Output
Manufacturer part no. 4131
$35.11≈ 30.92 €
Manufacturer part no. 4131
Listed by Pololu at €30.92. Delivered to France, including shipping, VAT and any customs duty, it comes to about €67.10. Prices last checked on 2026-09-30.
Delivered cost is an estimate for a single item shipped to mainland France; the seller's checkout is authoritative.
| Item | €30.92 |
|---|---|
| Shipping | €25.00 |
| VAT (20%) | €11.18 |
| Total delivered | €67.10 |
Estimate for a single item delivered to mainland France, shipped from outside the EU: customs duty and clearance fees may apply and are charged by the carrier.
| Qty | Unit price | Saving |
|---|---|---|
| ≥ 1 | $35.11 | |
| ≥ 5 | $32.30 | −8 % |
| ≥ 25 | $29.72 | −15 % |
| Voltage max. | 5.5 V |
| Voltage min. | 2.9 V |
| Weight | 8.5 g |
| Led current | 30 mA |
| Maximum current draw | 495 mA |
| Maximum range | 50 mm |
| Optimal range | 5 mm |
| Peak wavelength | 940 nm |
| Sensor count | 31 |
| Sensor pitch | 4 mm |
| Other pcb markings | 0J11376 |
| Output type | RC (measurable by digital I/O) |
| Pcb dev codes | irs51a |
| Sensor type | QTR |
This array of IR LED/phototransistor pairs is great for precisely identifying changes in reflectance (like line detection). It operates from 2.9 V to 5.5 V and offers dimmable brightness control independent of the supply voltage and separate controls for the odd and even emitters. In general, the closer the object, the higher the contrast between light and dark readings, but high-reflectance objects are generally detectable out to around 50 mm. This version features the traditional-style QTR sensors without lenses.
Semantically close products available for less — check the specs match your need.
| Size | 125.0 × 16.5 × 2.5 mm |
