These reflectance sensors feature a linear array of IR emitter/phototransistor pair modules in a high-density (4 mm pitch) or medium-density (8 mm pitch) arrangement, which makes them well suited for applications that require detection of changes in reflectivity. This change in reflectivity can be due to a color change at a fixed distance, such as when sensing a black line on a white background, as well as due to a change in the distance to or presence of an object in front of the sensor. A variety of sensor counts and densities is available so you can pick the ideal arrangement for your application. Since the outputs are all independent, you can connect just some of the channels to attain an irregular or non-standard sensor spacing.
Unlike our original QTR sensor modules, these units have integrated LED drivers that provide brightness control independent of the supply voltage, which can be anywhere from 2.9 V to 5.5 V, while enabling optional dimming to any of 32 possible brightness settings. For high-density (HD) modules with five or more sensors, there are separate controls for the odd-numbered and even-numbered LEDs, which gives you extra options for detecting light reflected at various angles. See the ?Emitter control? section below for more information on using this feature.
- Dimensions: 29.0 × 20.0 × 2.5 mm
- Operating voltage: 2.9 V to 5.5 V
- Sensor type: QTR
- Sensor count: 4
- Sensor pitch: 8 mm
- Full-brightness LED current: 30 mA (independent of supply voltage)
- Max board current: 62 mA
- Output format: analog voltages (0 V to VCC)
- Optimal sensing distance: 5 mm
- Maximum recommended sensing distance: 50 mm
- Weight: 1.5 g
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1x QTR-MD-04A Reflectance Sensor Array: 4-Channel