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| Lichtknarre: Unmodified Wii remote as a sight accurate Lightgun using 2/4 LEDs |
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| RandyT:
Looks like this one will give you some good info if you decide to go that way: It looks like they were forward-looking enough to leave space when they designed the module, to allow it to bend forward so a heatsink can be added and not be super tall. It may not heat up too much with short pulses, but some testing would certainly be necessary to make sure it can handle that momentary bit of high current over and over. Might also be a good idea to add some holes over where it's mounted to let any heat escape. That's the only thing about re-purposing shells without good dimensions...you have to decide whether you want to pay that much for a water bead blaster on the chance that it doesn't fit. I guess you could always use it to chase raccoons out of your garbage cans :) But I thought exactly the same thing when I saw it. Nice and modular guts and it looks like a good candidate if it's wide enough. If it is, then the plastic ribs won't be a big deal to trim out if need be. |
| Howard_Casto:
Eh I'm sure I could find 30 dollars worth of entertainment out of it and if for some reason it arrived and it didn't look like it would work amazon has an excellent return policy. Thanks for the link btw, that's helpful. Anyway, I think the shell should be wide enough. If you skip to around 2:50 it shows a shot of a guy putting the battery pack in there and it fits with about a quarter of an inch on each side. Since a wiimote is essentially the same width as a pair of AAs that should leave enough room and then some. 7.4 volts btw.... not sure what that would be useful for. It should be ok length wise as well. The trigger area is quite low on the build and even if I had to cut away some of the structure, I think there would still be enough room to keep it intact. Anyway I need to wire up a test rig this weekend and make sure I can get outputs working while using the software and I'll go from there. |
| RandyT:
--- Quote from: Howard_Casto on January 03, 2023, 09:20:05 pm ---If you skip to around 2:50 it shows a shot of a guy putting the battery pack in there and it fits with about a quarter of an inch on each side. Since a wiimote is essentially the same width as a pair of AAs that should leave enough room and then some. --- End quote --- If anything, I think it will either be perfect, or just shy of workable. If you look about a minute later at the barrel view, you can see that the upper section is narrower than where the batteries sit. Kinda getting the same vibe for the barrel diameter and the WA lens. :-\ --- Quote --- 7.4 volts btw.... not sure what that would be useful for. It should be ok length wise as well. The trigger area is quite low on the build and even if I had to cut away some of the structure, I think there would still be enough room to keep it intact. --- End quote --- I had a feeling they were AA type Li-Ions. When fully charged, they will be as high as 8.2v. I actually have some Li-Ions in that form-factor which are regulated down internally to the normal 1.5v per. They last a nice long time, even with the internal circuitry taking up space. Might be a good candidate for an internal (to the gun, not the battery :) ) regulator, if there's enough room for one. |
| lilshawn:
--- Quote from: RandyT on January 04, 2023, 03:49:29 am --- I had a feeling they were AA type Li-Ions. When fully charged, they will be as high as 8.2v. I actually have some Li-Ions in that form-factor which are regulated down internally to the normal 1.5v per. They last a nice long time, even with the internal circuitry taking up space. Might be a good candidate for an internal regulator, if there's enough room for one. --- End quote --- that would be a 14500 battery. essentially a small version of an 18650. i have some small garden lights that use one of those instead of 2x AA batts. |
| RandyT:
--- Quote from: lilshawn on January 04, 2023, 10:08:16 am ---that would be a 14500 battery. essentially a small version of an 18650. i have some small garden lights that use one of those instead of 2x AA batts. --- End quote --- They have their place in very specific circumstances like those, where the device was designed specifically with them in mind. But I've always wondered how many devices ended up in the landfill due to those things. Even using one to replace two normal AA's stuffs about 40% more voltage into a device than it would be expecting when fully charged, which usually means opening the gates for magic smoke and tears to escape. I've heard tales that a standard silicon diode, in series with a schottky diode can be enough to bring the voltage of a standard 3.7v Li-Ion down into usable range. This is based on a .6-.7v voltage drop of the silicon diode and the .3-.4 drop of the schottky. But it's not the best way to do it, as there are some possibilities for it to not work as expected and cook what you are powering. It also doesn't make a lot of sense now that very cheap and surprisingly decent regulators are easy to find. |
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