The valves make a clicking noise when their solenoids open and close the water valve. I figured that if I turn the valves on and off (after turning off the water supply) and listen then I might be able to hear the valves operating. The problem is that I didn't have anybody that would stand around flipping the switch on/off while I walked around the yard listening. So I built this circuit and connected it to the sprinkler system. Within two minutes I found the valves and had the leaks all fixed.
Parts List: wire, (AA,AAA,C,D or 9V) batteries, toggle switch, relay, leds, NTE955 timer chip, 1k resistors, 5k resitors, 4k resistor, 100uF capacitor, battery clip or battery pack holder, circuit board.
Step 1: Tools Used For This Project