Hi All,
I tried to find information about the real distance measurement of the ultrasonic module HC-RS04 but without success.
In the description it is written that range is 0-4.5m (0-5m in another source) but in reality I can only measure the distance up to 2.5m
Does anybody know anything about it?
Is it okay for those crapy sensors from e-bay?
Thank you guys in advance!
Cheers!
Did you buy one of those
Did you buy one of those sensors of ebay or are you considering getting one?
I bought one of those!
I bought one of those! Actually I bought two of them :)
And both of them are the same.
Do you think I made a mistake? 
Well that is what I am
Well that is what I am wondering, I am tempted to get 2 or 3 myself. But before I would like to see somebody here on LMR get one working with an Arduino.
Still 2 meters isn’t too bad, 4.5 or 5 would have been nice though.
You might want to post your code and setup so that people can help you.
I have one,
Do you mean HC-SR04 not HC-RS04?,
If so I bought one and it works fine with arduino.
Range is well over 3 meters.
Yeah, I meant HC-SR04The one
Yeah, I meant HC-SR04
The one that looks like this 
And I used the algorithm from here http://iteadstudio.com/application-note/arduino-ultrasonic-ranging-with-hc-sr04/
However I couldn’t get the range more than 2.5 metre 
