I'm trying to design a circuit where a pulse on the input toggles the output, but if the output remains high for a certain time (e.g. 2 seconds) it will go low by itself. Low output remains low until another input pulse occurs. (Again I'm looking to use low-voltage ICs with a 3V power supply, if possible.)
The best I've been able to come up with is something like this:
input --> toggle stage -(final output)-> missing pulse detector --> feed back and combine with input
It seems a missing pulse detector is done with a 555 timer; and the toggle stage could use the other 555 on a dual chip, which might save space. That's still a lot of components though, including an extra IC for the logic gate.
I'm thinking it would probably be easier to do this with a microcontroller. But there might be a simple circuit that I've overlooked. (Perhaps there's a clever single-stage 555 setup that will do this.) Does anyone here know of one?
The best I've been able to come up with is something like this:
input --> toggle stage -(final output)-> missing pulse detector --> feed back and combine with input
It seems a missing pulse detector is done with a 555 timer; and the toggle stage could use the other 555 on a dual chip, which might save space. That's still a lot of components though, including an extra IC for the logic gate.
I'm thinking it would probably be easier to do this with a microcontroller. But there might be a simple circuit that I've overlooked. (Perhaps there's a clever single-stage 555 setup that will do this.) Does anyone here know of one?