Did you know? Your (original/lite) DS basically has 3D touch!

Nintendo-senpai had advanced technology?
Surprising.
What's not is how much Bill saved on car insurance.
Geic-

I recall learning this when Colors was a ds homebrew and I was reading on the manual that the old ds and lite had pressure sensitivity. Wonder why they did away with it. i imagine it was a lack of games and such utilizing said feature. Great for art apps fur sure!

The DS also had a temperature sensor afaik, but it was so obscure that you didn't even have a GUI in the BIOS to callibrate it.

Edit: yup, DS and DSLite had a temperature sensor, but the firmware didn't use it, or barely anything, basically.

Wow, MarcusD, that I did not know. Maybe they were gonna make a Ds weather app or something.

Only the DS lite and very late models of the original one have pressure sensitivity, I bought 2 "phat" ds-es and only the one I bought in 2008 had pressure sensitivity.

I just noticed

The DS Lite isn't discontinued in NA

I remember Colors having it but I assumed it was just a side effect of having a resistive touchscreen, since those work by detecting pressure. I guess maybe the pressure level just isn't exposed on the DSi/3DS.
It took a little force just to get it to register anything at all though, and it took a LOT of force to get it to register maximum pressure, so it wasn't all that great for drawing, but still far better than no pressure sensitivity at all.
I remember there was a homebrew that used the temperature sensor. It seemed a bit inaccurate though.

that's pretty cool. it would have made for a fun warioware mini game

Pretty sure Lego Rock Band used some special trickery so you could play with the touch screen. I remember being able to do multi touch in that game.

Resistive multitouch is possible, it just doesn't work properly. I've seen some shitty Chinese phones use it.

Resistive double touch (not multi, that's impossible) works by detecting by touch history if the kinetic force of the touch point is so big that a human possibly can't move and stop the touch pen that fast, and detecting where it jumped.

In English: when you press the screen with two pens, and they are far apart enough, the touch sensor will register as if the actual touch point will be in the middle of the two points (linear interpolation with t=0.5). When you press the second pen on the screen, the touch point will jump from the first point to the center of the two points so fast a human possibly can't do such thing. And as you move the *second* pen, the center point will move with the half the distance, so you can get the second pen position by multiplying the first_point-->current_point vector by two.

All of this requires very fast timing though, especially if you plan on making it detect two touches "at the same time". Due to human timing imperfection it's possible if you dedicate enough CPU time for polling the touch data.

DiagnoSE uses the temperature sensor and I think that there is a homebrew that uses multitouch, too.

I touch my DS Lites in '3D' all the time.