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Maker Pro

Circuit help needed

JackRabbit

Feb 15, 2011
1
Joined
Feb 15, 2011
Messages
1
I am working on a project that uses an alarm clock to trigger an controller. My problem is that the alarm clock goes off and im using the speaker to trigger the control. My problem is that the speaker is putting out a square wave that isnt powerful enough to sustain a signal to the controller . I have thought about using relays to communicate between the two but I was looking for an easier route.

Thanks
 

Laplace

Apr 4, 2010
1,252
Joined
Apr 4, 2010
Messages
1,252
Is one side of the speaker grounded? You could use a low power Schottky diode to rectify the speaker signal then feed it to a low pass RC filter and use a comparator to sense the voltage level. Use the output of the comparator to drive the controller.
 
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