Is it possible to increase the sensitivity of an ultrasonic sensor? Like this one http://www.sparkfun.com/commerce/product_info.php?products_id=8504?
I am making a circuit with a friend and we need extremely high precision position measurement. We are using an electromagnet and positioning a metallic object below it. We don't want to pulse the current on and off, but it seems like this might be necessary. I was thinking of using a digital potentiometer, but I haven't been able to find one in a good range. Anything from 0 - 1000 ohms would be what we want, but I haven't found a pot with such a range. Ideally the voltage would be kept constant, and current could be adjusted. We might have to try to pulse it, but finer control would be had with variable current. I assume it's possible as power supplies can supply C @ CV.