Darkover
Archangel
- Jul 29, 2021
- 5,535
i used a astable multivibrator for a ir emitter and a Monostable Multivibrator combind with a ir receiver and sr latch basically creating a invisible line that when crossed would sound a buzzer the sr latch was used to remember it had been triggered basically a continuous source of ir was emitted and the ir receiver would rest the Monostable Multivibrator
Astable multivibrator: generated a continuous pulse signal to drive the infrared emitter — this keeps it emitting modulated IR light, which helps with noise immunity.
IR receiver + monostable multivibrator: The receiver resets the monostable pulse, meaning as long as infrared receiver is seen, the monostable doesn't time out — clever debounce/integrity handling.
When the IR beam is broken: The monostable isn't reset anymore, so it times out and its output changes.
SR latch: Captures that the line was crossed, holding the triggered state until manually reset.
Buzzer: Alerts that the beam was broken — created not just a trigger, but a memory of the event.
Astable multivibrator: generated a continuous pulse signal to drive the infrared emitter — this keeps it emitting modulated IR light, which helps with noise immunity.
IR receiver + monostable multivibrator: The receiver resets the monostable pulse, meaning as long as infrared receiver is seen, the monostable doesn't time out — clever debounce/integrity handling.
When the IR beam is broken: The monostable isn't reset anymore, so it times out and its output changes.
SR latch: Captures that the line was crossed, holding the triggered state until manually reset.
Buzzer: Alerts that the beam was broken — created not just a trigger, but a memory of the event.
