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Need to supress 0.5sec pulse for 0.5sec, then output

yamajason

Oct 12, 2015
2
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Oct 12, 2015
Messages
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I have a Directed Electronics Passive Keyless Entry, it flashes the Parking Lights for
0.5sec ON,
0.5sec OFF
0.5sec ON
OFF

I want to Ignore the 1st Pulse ON (which signals Locked) and only output signal on the 2nd Pulse (which signals Unlocked) this will Drive a Pulse Timer Relay.

The Parking Light Flashes/Pulses are (-)12VDC with 200ma capability.

What would you recommend?
 

Alec_t

Jul 7, 2015
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3,587
Welcome to EP!
The Parking Light Flashes/Pulses are (-)12VDC
Why the negative sign? Are these signal levels normally high (+12V), going to 0V (or -12V) for 0..5 secs?
Are these already-debounced signals, or are they from mechanical switch contacts (and so would need debouncing as a preliminary step)?
 

yamajason

Oct 12, 2015
2
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Oct 12, 2015
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The (-)12VDC is really +12V going to 0V ground from a chip. No debouncing required. Manual lists it as (-) output, but you're smarter than that. Thanks
 

Alec_t

Jul 7, 2015
3,587
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only output signal on the 2nd Pulse (which signals Unlocked) this will Drive a Pulse Timer Relay.
Does the output signal have to last 0.5 secs too?
What sort of signal (volts, current) is the Relay expecting?
 

GPG

Sep 18, 2015
452
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Sep 18, 2015
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Does the central locking have a locked/unlocked indication signal?
 
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