Hi, new to the forums and electronics in general so I apologise if i don't make sense or seem a little stupid. Additionally I have searched the forums & google with little luck.
I am doing a project at the moment which consists of a monostable one shot NE555 controlling how long a a stable NE555 chip flashes a led light for.
The monostable one shot output (pin 3) sends a 20 second on period to the astable 555 which flashes at approximately 1 flash per second.
My question is, how can I trigger the initial monostable circuit without the need of a physical push switch. My understanding is that the switch is there to briefly allow current to flow which initiates the process. Is there some sort of simple circuit or simple component that would help me in having a circuit that doesn't rely on a physical switch in that part of the circuit. I am trying to make a simple door alarm that is triggered using a reed switch. I hope this makes sense.
I am doing a project at the moment which consists of a monostable one shot NE555 controlling how long a a stable NE555 chip flashes a led light for.
The monostable one shot output (pin 3) sends a 20 second on period to the astable 555 which flashes at approximately 1 flash per second.
My question is, how can I trigger the initial monostable circuit without the need of a physical push switch. My understanding is that the switch is there to briefly allow current to flow which initiates the process. Is there some sort of simple circuit or simple component that would help me in having a circuit that doesn't rely on a physical switch in that part of the circuit. I am trying to make a simple door alarm that is triggered using a reed switch. I hope this makes sense.