AlphaBot User Manual
15
share awesome hardware
Obstacle avoidance module
Obstacle avoidance module
consists
of
an
infrared
transceiver and a comparator.
The infrared transmitter has an
infrared LED array as a
luminophor. When there is an
obstacle (reflector) on the
detection direction, the Infrared light will be reflected, and received by the infrared
receiver, which is a semiconductor with a PN junction made of a special material as
its core part. As the intensity of the infrared light enhances, more current can be
generated and the analog signal increases. LM393 comparator receives and
handles the analog signal, and then outputs the relative digital signal. At this point,
the green LED will light up. The logical level of the DOUT can tell you whether there
is obstacle in front of the sensor, and the output voltage of AOUT can tell you the
distance from the obstacle if there is. The detection distance can be adjusted via the
potentiometer knob.
Summary of Contents for AlphaBot
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