DIY flex sensor gloves for possible VR or video game control--- make money online

hi everyone I thought I'd make a video

and show the latest project that I've

been working on it is a ten finger flex

sensor arrangement built into two gloves

to do motion capture of all 10 fingers

and I used these flex sensors which you

can get from Sparkfun they're made by

spectra cymbal and it's basically a

variable resistor that changes value

when you flex it they typically only

work in one direction so it's flat you

get about 10 K and when you bend it I

think it goes up to about 15 K or

something like that so what I've done is

I've mounted them on these gloves these

are underarmor brand the yard to which I

selected because these are their batting

gloves and I selected them because the

has sort of like a two ply construction

so the outer layer is like this

synthetic leather and the under layer is

a cloth sort of liner on the inside of

the glove so it makes it easy to cut

little slits in the leather and then

insert the sensor through and as I'll

show you the mounting is not so trivial

you can't just sort of glue the sensor

on because what happens when you flex a

finger the sensor has to slide a little

bit up here and so if you fix the sensor

down throughout the whole finger length

it's just going to break or it's going

to be very difficult to flex the finger

because it needs to slide up here so

what I've done is I've used a needle and

thread to fix the base of at the bottom

of the sensor to this synthetic leather

coating and the rest of it is just

threaded through the glove material here

so it can slide pretty easily so this is

it allows quite a lot of dexterity you

can actually you know work with things

pretty much normally and the glove

doesn't really restrain very much

movement it's still pretty easy to

operate things

each of the ten flex sensors is

connected to a negative five volt source

which is generated in this little

monolithic 5 volt converter here put

some details up on those and the

negative 5 volts is run through the

sensor which is just a variable resistor

and then fed into an op-amp circuit so

there's ten identical op-amp circuits in

there I like using LM 324 s just because

they're good for you know a low

frequency relatively high or low DC

offset so they're good for DC circuits

and voltage measurement the trimpots

are designed to allow me to sort of

calibrate the circuit so that when the

fingers are straight they all give

approximately the same voltage output

value so what I did was just lay the

gloves flat on a table and then go

through each sensor and adjust the trim

pot so that I got about a nominal three

and a half a volt signal and then when

the finger is flexed the voltage goes

down so three and a half volts is sort

of closed

these aren't rail-to-rail op amps so if

you feed them a five volt source you're

only guaranteed about three and a half

out in this circuit I'm actually feeding

them with a six volt source so I can go

up to about four and a half volts output

voltage and I chose three and a half for

the nominal sensor output just to make

sure there was some Headroom there when

the finger is fully flexed the voltage

goes down to about one volt or maybe a

volt and a half the 10 individual analog

voltage signals from the op amps are

connected to a National Instruments USB

6210 which is just an analog capture

device and it makes it easy to get raw

analog voltages into a computer okay so

here we are in LabVIEW signal Express

this is just a really basic data capture

program and I'm going to put on both

gloves

okay and so now the upper graph has five

traces on it and so I'll close my hand

and you can see all the traces on the

upper graph and now open my hand again

traces move up and down like this and

this is each finger moving so you can

see the different color for each finger

and here's the other hand the lower

graph is the right hand so we're getting

a volt of signal swing from about three

and a half volts and if I close my hand

completely get about a volt and a half

or two volts on one finger

that's the thumb it looks like the

bottom graph is a scaling graph just to

show kind of the noise on one of these

lines I've set the top two graphs not to

auto scale so it's hard to see the noise

but it's easy to see the signal there if

I stop if I took off the gloves you can

see on the bottom here it's moving from

about three point four eight seven to

about three point four nine so really

eight nine it's really only oscillating

by a few millivolts or pretty much the

resolution of the of the digital analog

converter or the analog digital

converter so that's very good

so I don't have an actual application

for this yet this is a project for

someone else and they're going to use

the data from the National Instruments

software for another analysis but I

think this really could be used for a

lot of different things including you

know virtual reality and the obvious

sort of video game controls but they're

fairly solid gloves they're there's a

little bit of a problem with these

sensors sticking out the front so if

you're repeatedly picking off objects

that might be an issue but other than

that it leaves the palms totally open

and it really doesn't restrict movement

very much you still retain a lot of good

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