Brief Introduction on Ultrasonic Sensor
Ultrasonic sensor can detect the barriers in the certain distance of the horizontal direction, and
the transmitting and receiving angle is about 45 degrees.
The principle of ultrasonic sensor is derived from the bat, and its two probes are respectively transmit-
ting probe and receiving probe. Through transmitting and receiving ultrasonic signal, calculate the distance
between ultrasonic sensor and target object. This function can be applied in the projects such as automatic
barrier avoidance and distance measurement etc.
The ultrasonic transmitting probe will shoot the ultrasonic wave forward, and start timekeeping at the
same time of transmitting. The ultrasonic wave will propagate in the air and will be reflected back when
it contacts with barrier during the route, and the ultrasonic receiving probe will stop timekeeping immediately
after receiving the reflecting wave. The propagation velocity of ultrasonic wave in the air is about 340
m/s, according to the time t recorded by timer, the distance s between transmitting point and barrier can
be calculated, s=340×t/2, which is the so-called distance measurement method of time difference.
The tracking sensor can recognize the black lines in tracking map through infrared emission tube and
infrared receiving tube, which can allow Roby to move along the black lines in the white paper.
Ultrasonic sensor Barrier
Tracking sensor
Infrared emission tube
Infrared receiving tube
Infrared receiving tube
The white surface can reflect
more infrared light
The black surface can only reflect
less infrared light
Infrared emission tube
Brief Introduction on Tracking Sensor
Содержание ROBY
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