Programming instructions

Inventor’s Guide insert
accessories
sensor accessories
line follower kit • 3
1 Technical overview, continued
The optimal range for the line follower is approximately 0.02 to 0.25 inch.
The minimum line width it can detect is 0.25".
Sensor output will be low (0V) when the infrared light bounces back to
the detector – in other words, when the surface is pale or highly
reflective – and high (+5V) when the light is absorbed and does not
bounce back.
line follower kit, continued
Minimum
¼"
1/8" optimum
HELPFUL HINT:
Because the line follower uses an infrared LED to illuminate its target
and an infrared sensor to detect the reflected light, it will actually
work in low-light conditions or even in the dark! However, this
also means that it can easily become saturated — in other words,
everything will look white to it, like an over-exposed photograph — in
environments where there is a lot of infrared radiation. You’ll find
environments like this in competition settings where tungsten lights are
used for illumination. To avoid saturating the infrared sensor,
consider mounting it underneath the robot or adding a cardboard
shield to block ambient radiation.
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