lec 6

Question 1

what is an ultrasonic sensor used for

Answer 1

distance measurement typically comprises of an ultrasonic emitter and
an ultrasonic detector

Question 2

how can ultrasonic sensor detect sound waves

Answer 2

high frequency sound

waves produced by the emitter will bounce off solid objects and be reflected back to the detector

Question 3

how can you measure distance to object

Answer 3

speed of sound TIMES (pulse time of flight / 2)

Question 4

what is the emitter pulse called

Answer 4

chirp

Question 5

what is the receiver pulse called

Answer 5

echo

Question 6

what module is used for ultrasonic sensing , and how accurate is it

Answer 6

HC-SR04

3mm accuracy

Question 7

how to connect module to Arduino

Answer 7

Vcc (+5 volts)
GND (ground 0 volts)
Trig (connect any digital pin on OUTPUT)
Echo ((connect any digital pin on INPUT))

Question 8

what are the means of these key features on syntax -Variable_name = pulseIn (pin, value, timeout)

Answer 8

pin = pin value on I/0
value = logic condition (HIGH or LOW)
timeout = waiting time for pulse (usually 1 second)
variable_name = long integer data type, to hold delay time in microseconds.

Question 9

what is speed of sound dependant on

Answer 9

temperature