What I wanted to do is to measure distances using this emitter and reciever like this:
I've been searching info on how I should connect those to my arduino uno to send and know when I recieved the echo but I have nothing clear right now. Is it hard to do? Thanks!
You would be much better off buying a HC-SR04 or Ping sensor than trying to make those work. You will spend more time and money for a system that is probably less able. Google ultrasonic rangefinder circuits to see what you are up against.
So I just can't do a simple circuit to know if I recieved the signal and take the time by software?
Define simple. I Googled a bit and found this A Cheap Ultrasonic Range Finder. I was wrong, maybe it can be pretty simple. The code is for Pic but very well commented. Note that you may have to change the PWM frequency to make it work.
edit Still would be better off getting a HC-SR04 or Ping.
The transmitting side is not the problem; receiving it is.
