what is active buzzer ideal for
simple alerts and beeps
what frequency does buzzers produce
fixed frequency
what does an active buzzer have
oscillator
what is a passive buzzer
a buzzer that does not have oscillator. requires Pulse Width Modulation, and an external square wave
what is the advantage and disadvantage of a passive buzzer
more flexible with sounds, but more coding effort
distance measurement module that uses sound waves above human hearing range to detect object distance
Ultrasonic Sensor
outputs the time taken for the sound wave to return
Echo Pin
Arduino sends a 10 us pulse to the trig pin
. the module emits 8 ultrasonic signal
working principle of an ultrasonic sensor
Ultrasonic sensors work by sending out a sound wave at a frequency above the range of human hearing. The transducer of the sensor acts as a microphone to receive and send the ultrasonic sound. Our sensors, like many others, use a single transducer to send a pulse and to receive the echo. The sensor determines the distance to a target by measuring time lapses between the sending and receiving of the ultrasonic pulse. This process is a key aspect of ultrasonic sensor working.
the angle of detection for the HC-SR04 ultrasonic sensor is approximately
15 degrees
what affects the speed of sound the most in air
the temperature of air
what happens when you add a resistor to a buzzer
the sound volume decreases, because of reduced voltage
what is the timeDelay formula
1 second/ (2* Frequency)
what happens when you increase an octave for a buzzer
the frequency doubles
what does the tone function do
generates a square wave
what does the beat_length function control
temp
