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Auto Alarm

2016-02-18 21:15  
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Before arming circuit IOD, LED1 lights green. Before arming circuit SI operation, allowing the alarm 0 after - 45 seconds delay time. SI is the external key switch.

Auto Alarm 
 

After this delay circuit arm, LED1 lights red. Then, the sensor S2 S4 through - (NO) or S5 through S6 (NO) 2 U2 pull pin low, activate K1 and audible alarm. The duration of the alarm sound determined by R4 and C2. K1 editions and circuit after this time ready again. Manual reset is via the key switch, SI.

 


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