Does anyone know where I could acquire a remote controled on/off switch the size of a dime that could be used to open and close the circuit between a 3 volt CR2032 battery and an LED bulb? See the photo below for a visual on what I am looking for. The remote control would only need to have two buttons (on and off) and a very short range.
So what are you trying to accomplish with this device? What you are asking is actually not a trivial task, especially with the size and power constraints. It's hard to make a good suggestion without more information.
Thank you for your reply. The purpose of the device is to enable the user to turn on LED bulbs located inside small paper lanterns. By using a remote switch you can turn on many of the lamps at once.
An alternative solution would be a very small "pinch" on/off switch that could be sandwiched between two sheets of the material used to make the lamps. This would require turning on each of the lamps individualy. Not as elagant a solution, but workable.
The lanters are actually made from 5 mil clear polyester so the electronic components need to be as unobtrusive as possible. See the photo below. The battery and bulb assembly is contained in an envelope slipped in to the center of the lantern. The lantern size is 7" tall by 3" deep by 4" wide.
You might be better off just going with some of those keychain led flashlights with the switch built in. I can see it being a big hassle to make this reliable and run wires down to the edge if you are going to be building these by hand. For what you are asking a reasonably priced wireless solution is probably out of the question, but other ideas may exist.
I'm thinking something like this.
I agree... custom wireless would be expensive and a lot of work. And probably not as small as you're wishing for. I'd go with a small switch on each lantern.
For our wedding my wife purchased very inexpensive paper lanterns with LED lighting, and each had a very small flip switch and battery that would last about 12 hours. We just turned them on in the afternoon and they lasted through the wedding and reception.
How small a switch are you trying to find? Not sure if you'll find paper thin switches if that's what you're trying for. Digikey and other places carry pretty small on-off toggle switches that you could stick in a corner of the lantern and paint to match. Here's a quick example, and i'm sure there are likely other smaller options:
I purchased the smallest switch that Digi Key carries (that is what the tech told me) and it is too big. I know there is something smaller. I have seen greeting cards with a switch small enough to put between the layers of the card with just a 1/4 inch (or less) bump that you pinch to turn on.
Again, thank you for your response
You are probably thinking of Membrane keypads/switches that are that thin and likely what is used in cards. Unfortunately they are always momentary on/off switches, so unless you have some electronics logic to flip the power back and forth the LED would only be on while you held the switch down. Also Digikey doesn't sell individual membrane switches, just keypads with 4-16 buttons, like this:
You can try googling for membrane swiches and see if you can find a single. You might also have to add a small flip-flop circuit to toggle the power with each press.
Here's a thought. Get a little reed switch, like 374-1272-ND, and a little magnet, like 374-1129-ND. Put the magnet inside a plastic straw, seal the ends, and glue it to the lantern. Glue the reed switch by one end of the straw. Tilt the lantern to slide the magnet toward the reed switch, the LED turns on. Tilt the lantern away from the reed switch, the LED turns off.
One thing that stuck to my eye were LED bulbs with built in wifi. So far I just see fancy expensive ones that are dimmable and even can change hue. I'm wondering if there will be less expensive on/off ones.