missing "pulse" detector

Lem0nHead · 2009-05-28T18:28:06+00:00

hello I want to do something similar to a missing-pulse-detector, but I want it to detect also steady signals so I basically want to output high when the input is not switching up/down (up is around 1 second, down may be from 0.3s to 10s... but it doesn't need to be so exactly because it just should trigger if it's not switching for more than 15 seconds) I'm trying to avoid using a microcontroller, so maybe 555 can do that? input: _--_--___--_--______________--___--_-----------------_--_-- output: ______________________-----_________________------______

missing "pulse" detector

Lem0nHead

Member

Updated: Oct 25, 2024

Views: 927

hello
I want to do something similar to a missing-pulse-detector, but I want it to detect also steady signals
so I basically want to output high when the input is not switching up/down (up is around 1 second, down may be from 0.3s to 10s... but it doesn't need to be so exactly because it just should trigger if it's not switching for more than 15 seconds)

I'm trying to avoid using a microcontroller, so maybe 555 can do that?

input:
_--_--___--_--______________--___--_-----------------_--_--

output:
______________________-----_________________------______

0

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Harshad Italiya

Member • May 28, 2009

So you want to monitoring the Input Pules Continue?

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Lem0nHead

Member • May 28, 2009

godfather
So you want to monitoring the Input Pules Continue?
yes
summarizing
the output should go high if the input is steady high or low for more than 15 seconds
then the output goes down again when it switches

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Harshad Italiya

Member • May 28, 2009

Why not you use Microcontroller is there any restriction?

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Lem0nHead

Member • May 28, 2009

godfather
Why not you use Microcontroller is there any restriction?
no
I just find it easier if it's possible with one or two 555, if it's possible
otherwise I'd need to get a programmer board and learn to program

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Harshad Italiya

Member • May 28, 2009

yes let check out first that is it possible with 555 or not... and one more thinh buddy programming of Controller is not too much difficult.

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