Pololu QTR-8RC Manuel d'utilisateur télécharger pdf (Page 12)

7. Additional Considerations

As the sensing distance of your sensors increases, the distinction between black and white surfaces starts to decrease.

This problem can be exacerbated by infrared components of ambient lighting. The QTR-8x PCB was designed to help

shield the sensors from ambient IR, but this may not be sufficient for areas with unusually high ambient IR or in cases

where you need to mount your QTR-8x higher than the recommended 0.25" maximum. In these situations, you might

fight it helpful to use shielding (e.g. a skirt around your robot) to block ambient IR.

When troubleshooting your QTR-8x, a digital camera can be useful in determining whether the IR LEDs are

functioning as expected. Many older/cheaper digital cameras lack IR filters (most cell phone cameras fit in this

category) and can therefore be used to determine if the LEDs are on or off. However, some cameras (usually more

expensive ones) have better filters that block IR. In the picture below, a point-and-shoot camera shows the IR LEDs

of our IR Beacon [http://www.pololu.com/product/701] shining (in purple) but the DSLR with which the picture is taken

does not show the LEDs.

7. Additional Considerations Page 12 of 12

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Pololu QTR-8RC Manuel d'utilisateur Page 12