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2.3.2
Brain tracking unit
The brain unit, in a rigid plastic case, can be plugged into one of the SENSE
sockets.
The brain tracking unit has two IR (infrared) sensors that enables it to track the
IR transmitter.
The two IR sensors are at the same line with an opaque partition between them.
When IR light falls on both of them, it means that the SENSE is in front of the IR
light source.
When the SENSE is at angle to the light source, the IR light will fall only on one
of the IR sensors.
The third IR sensor measures the environment IR light. The brain unit controller
uses this measurement to eliminate the environment light.
The brain unit output is a binary number that describes the detection status of an
IR transmitter. This number is converted to detection results as the following:
None (00) – No IR transmitter light
Right (01) – IR transmitter light on the right
Left (10)
– IR transmitter light on the left
Front (11) – IR transmitter light at front
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