This is definitely a crazy idea, but is the flex casing malleable enough to press a button in the implant? (momentary or toggle)
To, for example:
*my idea was to make a payment implant that can do lights too, but it might draw too much current so you get to pick lights, or payment depending who you want to impress
I don’t think that’s a concern, a few credit cards have little lights built in, and I’m pretty sure @fraggersparks even has a payment implant with blinkies already
Mostly I’m just curious if you would be able to press a button at all through the coating, because why not 
and my plan with the lights is to have a circle of 8 in a rainbow, sort of like this tattoo
Do you think that would draw too much?
Technically you can have 8 independent LEDs to achieve that result, which means each one does it’s own draw through it’s own antenna.
The magnetic field from a reader should be more than enough to power all of them + other implants.
The furthest I tested were 6 LED nails + 6 DF2, simultaneously though the same reader. had no issues and could probably have gone way further up!
Now regarding the maleability of the coating, I believe only @amal could state about it.
I would personally go for a magnectic switch (something sturdier than a reed one), because mechanical manipulation will eventually wear something out.
My main concern would be the skin elasticity pressing the button itself when it’s not wanted
I don’t see why you couldn’t make a button in an implant though, I just don’t see it working well
Ah, well, that is a little bit more than a single LED and out of my range of knowledge in this case
On the topic of weird LED ideas for implants, does anyone know the size of the LED chip used in the xSIID or similar?
There are some really small fast-flashing style RGB LEDs available now, and an RGB implant would make for just about the ultimate party trick
I would personally go for a magnectic switch
now that’s a really good idea
do you think I could run 8 LEDs and a chip off a single antenna? it would simplify the design is all
The problem I see is that things like momentary buttons and reed switches need to be powered while being activated since they momentarily divert current. This means you would need to be activating the switch while scanning the implant which would be awkward.
I had no idea these existed! Awesome!
I’ve also thought about things like micro switches and flexible dome cap push buttons under our flex material. I think it’s totally possible but has not been tested yet. Part of the problem is that these buttons don’t have a latching feature, or at least none that I’ve seen… so basically if you wanted to use a button to enable a chip for example you would have to hold it while being scanned and that presents kind of a space and logistics problem. It would be cool if you could click a switch on and then scan your chip and then click it off again in a way that was totally mechanical.
You’re not thinking it through: with a latching reed switch, you provide the function, it’s sealed and safe and - most importantly - you incentivize the customer to buy the implantable control accessory: a Titan magnet 
Haha well how would you easily reverse polarity on your Titan to reverse the latch in the relay?
You don’t need to reverse the polarity: latching reeds also work by presenting the same pole front or rear of the switch.
EDIT: by that I mean present the magnet at one end or the other end, not flip your implant over.
Right ok interesting. Might be worth a look… particularly for larger devices.
Yeah and those glass switches are void inside and extremely fragile. I wouldn’t want to implant something like that as-is. Maybe a reinforced glass enclosure of some kind…
Could? yes.
Should? I would not reccomend.
A single antenna means:
Could be done, but I would go down another route.
I planned for myself a circle of LEDs as part of a tattoo similar to the circle you described. What I’ll do is to use LED nails, individually sealed, and implant them one at a time, over a longer period, to make them settle properly.
Hence the Latching model @anon3825968 posted.
although I totally agree with:
Hence me mentioning earlier “something like a reed, but sturdier”.
I think the picture confused my point, I’m thinking a 1cm diameter circle of LEDs, with a single antenna the size of the flexNExT
@amal, what are the LEDs you use in the implants?
There aren’t any LEDs used on flex implants anymore, and you will notice that the flexNExT has been discontinued / all other round flexes no longer offer LEDs as an option. This is due to most of them failing after some length of time 
. Those ones were actually NFC LED fingernails made in China, so the LED specifications are unknown AFAIK. Also implants that big don’t seem to fare very well due to flexing under the skin, though the flip chip / sticker style assembly uses in the flexNExT was far far worse than the copper coil used in the flexMN and flexMT.
In terms of actually powering multiple LEDs from one antenna, like Eyeux has said, its definitely possible. To add a little bit to the downsides… different coloured LEDs have difference capacitances, currents and forward voltages for a given brightness. It might be possible to have them all in parallel and find an antenna that lights them all up when directly connected, but they definitely wouldn’t have consistent brightness. It’s a lot lot easier to have just one colour / LED type. Obviously adding circuitry / a microcontroller and regulator etc. but that is a lot more complexity and things to go wrong. Some people I know are trying it anyway though 
, and I’ve considered designing some too (a friend of mine might be working on a project to drive 4 RGBW LEDs )
Could you induce enough current with a magnet or magnetic field in some kind of Hall effect sensor to flip a bit/gate and have a button type functionality that way?
Sure do, but don’t count on it being possible. My blinky is only working still due to the fact it had a nice stable base so it didn’t fold or curl - because the implant I had converted was as-is and massive compared to a Flex.
