Tired of torn-up flower beds, Hap took matters into his own hands by combining a sprinkler and wireless driveway alert system. To allow enough time for the sprinkler valve to open, build pressure, and activate the sprinkler head, he constructed a time-delay unit from an old standby 555 timer. It activates the sprinkler valve with ac power from the control for 10 to 12 seconds — allowing plenty of time to open and apply a good H2O dousing to varmints and wayward mailmen alike. Scroll down to view a video demonstration and the parts list.
Timer Delay Circuit for Motion Detection System
Amt
Part Description
Allied Part #
1
555 Timer IC
263-0133
2
1N4004 Diodes
266-0004
1
Green LED
670-1199
1
Yellow LED
670-1066
1
SPST Mini Switch
642-1136
1
5V dc DPST Relay
886-2529
1
25K potentiometer
754-1257
1
470 ufd Capacitor
852-6566
1
5 ufd Capacitor
507-1056
1
10 ohm Resistor
296-6400
2
100 ohm Resistor
296-5644
2
1 Kohm Resistor
296-5562
1
15 Kohm Resistor
296-5720
1
Terminal Strip
607-7058
Additional parts required: Reporter Wireless Alert System with (1) Transmitter and (1) Receiver; Optima Sprinkler Control Panel
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