Hello all, I have a question about a seemingly simple circuit I’ve built. I’ve connected a low voltage laser light (3v DC) to a power source and a momentary pushbutton. I’ve placed an object atop the button to depress it so that it turns on the light to illuminate it. As soon as the object is removed, the light goes off as intended. My problem is that with this setup, I cannot prevent someone from just pressing the button again and turning on the light. I am searching for a way to instead have the light go off and STAY off until something else resets it. My preference is to kill the power and then reset it later. I can use a remote control socket to plug the power source in and once it gets turned off, simply use the remote to turn it back on. (I suppose I could also do it with a second button to reset but I am trying to avoid that. I don’t want anyone turning the laser on by themselves and adding a second button anywhere close might invite that.) What device could I add to this simple wired circuit to facilitate killing the light and/or button or (even just the power) once the button changes its state from on to off? Preferably in such a way that powering the circuit again would reset everything to it’s initial state?
I am thinking something like this. You would place the item on the light first. Then you would press the Master set switch for it after and it should hold the relay in the toggled state.
The next option would be to use a DPDT relay instead so you can also toggle another circuit to do something. That way it can be any other voltage / current rating.
Ah, thanks! That does seem efficient and simple. Are you able to tell me a specific part # I should order for the relay latch?
Ah, also sounds like a good solution. Not familar with the DPDT relay so I will try to look those up on here. thanks!
For a relay option that would really depend on how you would like to use it as well as the other specifications for these too.
If you went with the DPDT option you can use any voltage and current system you want to be the trigger and hold side and have the laser on the other to turn it on and off.
Or you could have the trigger and hold side also turn on the laser and have the other cause something else to happen.
Which of these you pick would change the specific relay used.
Also we would need to know how you would like to have the relay mounted as well as where you want it mounted.
Looking over what you said originally. If you are wanting to have the mechanisms / control items affect the room remotely then the last part is not too much of an issue if you have the extra space for it.
So currently, the entire system is enclosed within a wooden box with the button protruding from the top. An object sits above the momentary pushbutton which depresses it to the ON position. This closes the circuit which lights the laser. The power source is from a wall outlet with a remote activated outlet plugged into into and a 3v 1A DC transformer plugged into that and wired into the circuit. Removing the object releases the button which cuts off the laser. Of course, it’s still able to be turned back on just by pressing the button again which is what I’m trying to prevent. I am using the remote to cut power completely for now but it’s an inefficient method. My preference would be to keep this all contained inside the wooden box but I can certainly run a wire out of the room to another location if that is necessary. All items are to be mounted either onto the wood interior or are embedded into and through the wood itself ( i.e. the laser and button).