Hi. Ive designed a motorbike alarm circuit but have come across a problem. I ma using a mercury tilt switch to trigger the 555 timer but have encountered the problem that if the imput is held on, i dont get the pulse i need to start the timing.
what i really want to happen is that when then switch it closed, the alarm will go off and when the switch is openened again, it will start timing.
Any help would be greatlt appreciated. This is for my as level technology project and the deadline is looming.