UltraSonic signal processing

Projects General Guidance
1

I am completely new to Arduino and I want guidance on how to go by in my project:

I have a 40kHz ultrasonic receiver and I want to see the signal received on my computer using Arduino.

It should be a bit accurate, what do I need to do/use?

2

It should be a bit accurate

Right.

Use an oscilloscope.

3

https://playground.arduino.cc/Main/SharpIR

if u want it to be super accurate, a matrix lookup table.

feedback/echo is a major problem too if in a closed area

4

tzijie:
Arduino Playground - HomePage

if u want it to be super accurate, a matrix lookup table.

feedback/echo is a major problem too if in a closed area

IR != ultrasound

I've never had feedback problems with ultrasound.

5

AWOL:
IR != ultrasound

I've never had feedback problems with ultrasound.

oh my bad. I've worked with ultrasonic and IR for quite a while last year, got the wrong bookmark.

i was doing a maze solving robot last year, which uses ultrasound n IR. ultrasound pulses through the arena(2m square) and obstacles quite a bit. readings were sometimes jitterish.

had to do a take a bunch of readings, sort it and get its median

6

Maybe you're confusing "echoes" with "feedback".
Try not to do that.

7

Leaving enough time between readings should deal with the echoes. That's what I had to do measuring the water level in a smallish enclosed reservoir using ultrasound. A short delay was all it took to get much better readings.