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Registered Member #1517
Joined: Wed Jun 04 2008, 06:55AM
Location: Chico CA
Posts: 304
I am designing a killswitch for my robotics platforms and I need to create a circuit that will watch the output of a tone decoder (on the receiver side), and go low if the output of the tone decoder stays low for more than 500ms. Any ideas?
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Hi,
If I'm understanding the problem correctly, any re-triggerable monostable will do. But I'm not sure if it's to be called a kill switch, it's more of a keep-alive signal I would say, very useful but I'd think it has to go back on as soon as you start sending the signal. If your robot is a really mean beast with large danger of running rampage then you could add a flip-flop or a relay(safer!) that kills off the power supply for good, until you manually reset. But note that then you have to risk your life approaching the beast to turn it on again.
Registered Member #1517
Joined: Wed Jun 04 2008, 06:55AM
Location: Chico CA
Posts: 304
Thanks Marko. With this circuit, correct me if I am off track here, but if the input is low, and stays low, the output will remain high correct? If the input goes high, and stays high, then the output will go low after t=RC?
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
coillah wrote ...
Thanks Marko. With this circuit, correct me if I am off track here, but if the input is low, and stays low, the output will remain high correct? If the input goes high, and stays high, then the output will go low after t=RC?
AFAIK, when you consider the metastable state of a monostable an 'active' state, the retriggerable monostable can be triggered at any time, and the active state lasts for it's set duration after the last pulse received. If trigger pulses come frequently enough, the output state will always be active.
A nonretriggerable monostable on the other hand ignores the input pulses until it has expired; it's active period lasts only from the first received pulse. You don't want to use that because you'll invariably end with gaps in output. That's useful for things like frequency division and etc.
There are plenty of circuits you can use, I don't know anything about your circuit so not sure what to recommend. You couldperhaps even get away by using only 555's.
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