im working on my GCSE project and im making a door alarm and so in one of my circuits ive decided i want to put in a 555 timer to make a delay start so the user can get out of the room before the alarm is activated (it is triggered using a infra-red receiver). i have managed to make the 555 timer part of the circuit but i have no idea how to make it into what i want? I also dont know how to use the infrared receiver, as i havent been taught using the circuit symbol yet, but i have to use it rather than the reed switch and the hall effect which i already have, and the ultrasonic range sensor which will be in the last circuit
can anyone give me a hand with this?? i have to hand everything in by tuesday so asap would be nice )
can anyone give me a hand with this?? i have to hand everything in by tuesday so asap would be nice )