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Small green Grove IR distance sensor board with black ITR9909 photosensor and blue potentiometer

Seeed Studio

Seeed Studio Grove IR Distance Interrupter v1.2 transducer

SKU CH-5SQ4-JMCJY

An IR reflective sensor using an ITR9909 photosensor to detect objects up to 40 cm away, with adjustable sensitivity via an onboard potentiometer and a Grove connector for plug-and-play use

  • Product typeSensors
  • Highly sensitive detection using ITR9909 reflective photosensor
  • Detects objects up to 40 cm away
  • Adjustable sensitivity via on-board potentiometer
  • Durable construction resists easy damage
  • Grove unified socket enables plug-and-play integration

IR distance interrupter for object detection

The Grove IR Distance Interrupter v1.2 uses an ITR9909 reflective photosensor to detect objects blocking the light path. It outputs a digital HIGH signal when reflected light is received and a digital LOW signal when the path is clear or the object is too distant. An on-board LED indicates the detection status for immediate visual feedback. The module connects via a Grove unified socket for plug-and-play integration.

Detection range limited to 40 centimetres

The sensor operates effectively within a 7.5 to 40 cm detectable range, beyond which the output remains LOW regardless of object presence. Sensitivity can be tuned using the on-board potentiometer to suit different surface reflectivity and ambient conditions. Performance varies with surface colour, as lighter surfaces reflect more infrared light than darker ones at the same distance.

Adjustable sensitivity via potentiometer

A rail-to-rail operational amplifier boosts the phototransistor signal, and its gain is set by a physical potentiometer adjusted with a screwdriver. This single hardware control determines the detection threshold for all target surfaces and distances. Buyers who need software-configurable thresholds or multiple preset detection zones cannot meet that need with this module.

How it compares

Measured against everything we stock in Sensors, Transducers & Thermometers, at today’s prices. Recalculated every night.

Price $18.99
Cheaper than about 78% of the 255 comparable items (median $39.99).

Specifications

Product
Product typeSensors

Questions about this item

Which version of the Grove IR Distance Interrupter should I choose?

The product supplied is version 1.2, the only version listed in the current stock.

What does the 40 cm detectable distance mean when the sensor is mounted in my project?

It indicates the maximum range at which a reflective object can trigger a digital HIGH output; actual range varies with surface colour and ambient light.

What interface does the module use and what does it limit in practice?

It uses a Grove unified socket for plug-and-play digital I/O, limiting integration to platforms with compatible 4-pin connectors.

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