I am trying to build a relatively 'simple' circuit with a piezo sensor that turns on an LED for ~10-20 seconds after it has been tapped.
In the off-state the circuit should use zero current to preserve battery life. I would also like to avoid any ICs. Just some simple capacitors/resistors/mosfets etc.
I have tried a few different latch circuits - which seem to work fine with a normal button but I am not able to get them to work with the piezo sensor.
What would be the best approach to this?