How to measure ultrasonic sound waves using led pulse width modulation?
Answers
Answer:
The easy way to read the distance as centimeters is to use the formula: Centimeters = ((Microseconds / 2) / 29). For example, if it takes 100µs (microseconds) for the ultrasonic sound to bounce back, then the distance is ((100 / 2) / 29) centimeters or about 1.7 centimeters.
Ultrasonic sensors work by emitting sound waves at a frequency too high for humans to hear. They then wait for the sound to be reflected back, calculating distance based on the time required. This is similar to how radar measures the time it takes a radio wave to return after hitting an object.
Ultrasonic principle: Ultrasonic sensors emit short, high-frequency sound pulses at regular intervals. ... If they strike an object, then they are reflected back as echo signals to the sensor, which itself computes the distance to the target based on the time-span between emitting the signal and receiving the echo.
Ultrasonic sensors are used around the world, indoors and outdoors in the harshest conditions, for a variety of applications. Our ultrasonic sensors, made with piezoelectric crystals, use high frequency sound waves to resonate a desired frequency and convert electric energy into acoustic energy, and vice versa.
Answer:
The “ECHO”(PWM) ,Ultrasonic Distance Sensor from Rhydolabz is an amazing product that provides very short (2 cm) to long-range (400 cm) detection and ranging. The sensor provides precise,Stable non-contact distance measurements from about 2 cm to 400 cm with very high accuracy. Its compact size, higher range and easy usability make it a handy sensor for distance measurement and mapping. The board can easily be interfaced to microcontrollers where the triggering and measurement can be done using Single I/O pin. The sensor transmits an ultrasonic wave and produces an output pulse that corresponds to the time required for the burst echo to return to the sensor. By measuring the echo pulse width, the distance to target can easily be calculated
Explanation:
Professional EMI/RFI Complaint PCB Layout Design for Noise Reduction
Range: 2 cm to 400 cm
Accurate and Stable range data
Data loss in Error zone eliminated
Modulation at 40 Khz
Mounting holes provided on the circuit board
Triggered externally by supplying a pulse to the signal pin
5V DC Supply voltage
Bidirectional TTL pulse interface on a single I/O pin can communicate with 5 V TTL or 3.3V CMOS microcontrollers
Comparable to Parallax PING.
Echo pulse: positive TTL pulse, 87 µs minimum to 30 ms maximum(PWM)
On Board Burst LED Indicator shows measurement in progress
3-pin header makes it easy to connect using a servo extension cable, no soldering required