Has anyone daisy chained these sensors before: Ultrasonic Range Finder - LV-MaxSonar-EZ1 - SEN-00639 - SparkFun Electronics
I'd like to be able to measure the level of grain in 5 silos and instead of using the inputs up it mentions that it is possible to do it all with two pins. How does this work? WHen it cycles through the sensors, how does the arduino know which one is telling it the distance at any one time?
If I was to buy 5 of these senors, it will it definitely work with arduino on at least 4 or less pins for the lot of them?