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Help! Where are my Sprinkler Valves Located?

Step 2Project Schematic

Project Schematic
The wiring schematic is shown in the picture.

Usage Instructions:
1. turn off water to sprinkler system
2. connect valve across relay (24VAC systems)
3. turn on circuit by closing SPST switch
4. turn on sprinkler system and select valve that is connected to the circuit.
5. LED light on circuit will blink alternately.
6. relay will open and close one time per second.
7. sprinkler valve will turn on one time per sec.
8. listen to ground and you should hear valve turning off and on.
9. if you still can't find valve then increase timer circuit frequency by changing values of R1,R2 and C per the equations shown below. Increasing frequency will make solenoid hum louder.
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