Hi all- It's amazing how helpful the experts on this forum are.
I need help, myself, with the following problem:
I have an RC plane application where I need a circuit that just has one input and one output. I need the circuit to be able to switch on (or source/sink) a load after waiting two seconds after the input goes low, and then when the input goes high, have it wait for seven seconds, then switch off the load. If the input goes high during the two-second timeout, then the timer should reset and wait for the input to go low again. The seven second timeout should not be interruptable, ideally.
The supply voltage and the voltage switched is 3.7-4.2 volts (one lipo cell.) The switched load is approximately 160mA.
It seems easy enough to do this with a PIC, but I was hoping to avoid using a programmed chip. It seems like it could be done with some NAND gates and resistor/cap network, or a 555 or 556 chip in some combination, but I am not yet knowledgeable enough to be able to design a circuit like that myself. The fewer the components, the better. I was hoping that someone had a sample circuit that does much the same thing, or knew where one was...
Suggestions?