Force Sensitive Resistor Fsr

7/24/2019 Force Sensitive Resistor Fsr

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Force Sensitive Resistor(FSR)Createdby Ladyada

Last updated on 2013-07-30 05:15:18 PM EDT


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Adaru!t "ndustr!es #ttp:$$%earn &adaru!t&'o($or'e-sens!t!)e-res!stor-sr Pa*e 22o

Guide Contents

+u!deContents 2

,)er)!e 3

.o(e /as!'.tats T#ese stats are spe'!!'a%%yor t#e "nter%!n02 but near%ya%%.4s !%%be s!(!%ar&

C#e'!n* t#e datas#eet!%%a%ays !%%u(!nate any d!eren'es

oto (easureor'e$pressure!t# an . 4

Test!n*an .4 6

Conne't!n*to an .4 7

s!n*an .4 8

Ana%o*8o%ta*e4ead!n*Met#od 8

.!(p%eDe(onstrat!ono se 9

.!(p%eCode or Ana%o*.4 Measure(ents 11

"n-Dept#Code or Ana%o*.4 Measure(ents 13

/,7.; 4ead!n*.4 Measure(ents

E=a(p%ePro>e'ts 20

/uy an .4 21
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Overview

.4s are sensors t#at a%%o you to dete'tp#ys!'a%pressure s?uee@!n*and e!*#t&T#eyare s!(p%eto use and %o 'ost& T#!s !sa p#oto o an .4 spe'!!'a%%yt#e "nter%!n02(ode%&T#e

1$2 d!a(eterround part !st#e sens!t!)eb!t&

T#e .4 !s(ade o 2 %ayersseparated by a spa'er& T#e (ore one presses t#e (ore ot#oseA't!)eE%e(entdots tou'# t#e se(!'ondu'torand t#at (aes t#e res!stan'e*o don&


4/25

.4s are bas!'a%%ya res!stort#at '#an*es !tsres!st!)e)a%ueB!n o#(s C depend!n*on #o(u'# !t!spressed& T#esesensors are a!r%y %o 'ost and easy to use but t#eyEre rare%y

a''urate& T#ey a%so)ary so(e ro( sensor to sensor per#aps 10F& .o bas!'a%%y#en youuse .4s you s#ou%don%y e=pe't to *et ranges o response&


5/25

As eE)e sa!dt#e .4Esres!stan'e'#an*es as (ore pressure !sapp%!ed&


6/25

Testin' an FSR

T # e e as!est a y to deter(!ne # o y o u r . 4 o r s !s to ' o nn e ' t a (u%t!(eter !nres!stan'e-(easure(ent (odeB#ttp:$$adaru &!t$aJJDto t#e to tabs on your sensorand see #o t#e res!stan'e'#an*es& /e'auset#e res!stan'e'#an*es a %ota auto-

ran*!n*(eter ors e%% #ere& ,t#er!se>ust(ae sure you try d!erentran*esbet-een 1 Mo#( and 100 o#( beore E*!)!n*upE&
http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://adafru.it/aZZhttp://adafru.it/aZZhttp://adafru.it/aZZhttp://adafru.it/aZZhttp://adafru.it/aZZhttp://adafru.it/aZZhttp://adafru.it/aZZhttp://adafru.it/aZZhttp://adafru.it/aZZhttp://adafru.it/aZZhttp://adafru.it/aZZhttp://adafru.it/aZZhttp://adafru.it/aZZhttp://adafru.it/aZZhttp://adafru.it/aZZhttp://adafru.it/aZZhttp://adafru.it/aZZhttp://learn.adafruit.com/multimeters/http://learn.adafruit.com/multimeters/http://adafru.it/aZZ


7/25

Connectin' to an FSR

/e'ause.4s are bas!'a%%yres!storst#ey are non-po%ar!@ed&T#at(eans you 'an'onne't t#e( up Ee!t#er-ayEa and t#eyE%%or>ust!ne;

.4s are oten apo%y(er!t#'ondu't!)e (ater!a%s!%-s'reened on&T#at(eans t#eyErep%ast!'and t#e'onne't!ontab !s 'r!(pedon so(e#atde%!'ate(ater!a%& T#ebest -ay to'onne't to t#ese !sto s!(p%yp%u*t#e(!ntoabreadboard&

or use a '%a(p-sty%e'onne'tor%!e a%%!*ator'%!psor a e(a%e#eader&

o r a ter(!na%b %o ' s u ' # a s P#oen!=K1 88 1 8 B#ttp:$$adaru &!t$aHJD
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8/25

"t!sposs !b%eto so%deronto t#e tabs butyou must be very

fastbe'ause ! your !ron!snot*ood ?ua%!tyor you da%%ye)en a e se'onds you !%% (e%tt#ep%ast!'and ru!nt#e .4; +on/t attempt to solder directly to your FSR unless you are a%solutely sure youhave the sills to do so&


9/25

0sin' an FSR

1nalo' 2olta'e Readin'3ethod

T#e eas!est-ay to (easure a res!st!)esensor !sto 'onne't one end to Poer and t#e

ot#er to a pull4down res!storto *round& T#ent#epo!ntbet-een t#e !=ed pu%%donres!storand t#e )ar!ab%e.4 res!stor!s'onne'ted to t#e ana%o*!nputo a (!'ro'ontro%%ersu'# as an Ardu!no Bs#onD&


10/25

or t#!se=a(p%e"E(s#o!n*!t!t# a 5 supp%ybut note t#at

you 'an use t#!s!t# a 3&3) supp%y>ustas eas!%y&"nt#!s'on!*urat!ont#e ana%o*)o%ta*eread!n*ran*es ro( 0 B*roundD to about 5 Bor about t#e sa(e as t#e poer supp%y)o%ta*eD&

T#e ay t#!sors !st#at as t#e res!stan'eo t#e .4 de'reases t#e tota%res!stan'eot#e .4 and t#e pu%%don res!storde'reases ro( about 100Ho#(to 10Ho#(&T#at(eanst#at t#e 'urrent %o!n* t#rou*# bot# res!stors increases#!'# !n turn 'auses t#e )o%ta*ea'ross t#e !=ed 10Hres!storto !n'rease&"ts?u!tea tr!';

Force

(l%)Force

(5)

FSR

Resistance(FSR 6 R)

ohmCurrentthru

FSR6R

2olta'eacross

5one 5one "n!n!te "n!n!te; 0 (A 08

"&"

!" 5 30 Ho#( 0 Ho#( 0&13 (A 1&3

"#

l%7 5 6 Ho#( 16 Ho#( 0&31 (A 3&1

# l% 7" 5 1 Ho#( 11 Ho#( 0&5 (A &5

## l% 7"" 5 250 o#(10&25Ho#(

0&9 (A &9

This table

indicates

the approximate

analog

voltage

based on the sensorforce/resistance w/a 5Vsupplyand 10Kpulldownresistor.

ote t#at our (et#od taes t#e so(e#at %!nearres!st!)!tybut does notpro)!de%!near)o%ta*e; T#atEsbe'ause t#e )o%ta*ee?uas!on!s:

2o 8 2c c ( R , (R 6 FSR) )

T#at!st#e )o%ta*e!sproport!ona%to t#e inverseo t#e .4 res!stan'e&


11/25

Simple +emonstration of 0se


12/25

T#!s set'# !%% tae t#e ana%o*)o%ta*eread!n*and use t#at to deter(!ne#obr!*#tt#ered LED !s&T#e #arder you press on t#e .4 t#e br!*#tert#e LED !%%be; 4e(e(bert#att#e LED #as to be 'onne'ted to a P


13/25

T#ese e=a( p%es a ss u ( e y o u n o s o ( e bas!' Ard u!nopr o*ra((!n * &" y o u d o n Et(aybespend so(e t!(ere)!e!n*t#ebas!'sat t#e Ardu!notutor!a%LB#ttp:$$adaru &!t$aHD

$I .4 test!n*set'#&

Conne't one end o .4 to 5 t#e ot#er end to Ana%o*0&T#en' onne't one end o a 10H res!storro( Ana%o*0 to *roundConne't LED ro(p!n 11 t#rou*# a res!storto *round

or (ore !nor(at!onsee &%adyada&net$%earn$sensors$srt(%I$

!ntsrAna%o*P!nM 0N $$ .4 !s' onne'ted to ana%o*0!ntLEDp!n M 11N $$ ' onne't 4ed LED top!n 11 BP


14/25

Adaru!t "ndustr!es #ttp:$$ %earn &adaru!t&'o($or'e-sens!t!)e-res!stor-sr Pa*e 12 o 21


15/25

T#!s 'ode doesnEt do any 'a%'u%at!ons!t>ustpr!ntsout #at !t!nterpretsas t#ea(ount opressure !n a ?ua%!tat!)e(anner& or (ost pro>e'tst#!s !spretty (u'# a%%t#ats needed;

$I .4 s!(p%etest!n*set'#&

Conne't one end o .4 to poer t#e ot#er end to Ana%o*0&T#en' onne't one end o a 10H res!storro( Ana%o*0 to

*round

or (ore !nor(at!onsee &%adyada&ne t$%earn$sensors$srt(%I$

!ntsrP!n 0N $$ t#e .4 and 10H pu%%donare ' onne'ted to a0!ntsr4ead!n*N $$ t#e ana%o*read!n*ro( t#e .4 res!stord!)!der

)o!d setupB)o!dDO$$


16/25

Adaru!t "ndustr!es #ttp:$$ %earn &adaru!t& ' o($or'e-sens!t!)e-res!stor-sr Pa*e 1 o 21
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17/25


$I .4 test!n*set'#&

Conne't one end o .4 to poer t#e ot#er end to Ana%o*0&T#en' onne't one end o a 10H res!storro( Ana%o*0 to*round

or (ore !nor(at!onsee &%adyada&net$%earn$sensors$srt(%I$

!ntsrP!n 0N $$ t#e .4 and 10H pu%%donare ' onne'ted to a0!ntsr4ead!n*N $$ t#e ana%o*read!n*ro( t#e .4 res!stord!)!der !ntsr8o%ta*eN $$ t#e ana%o*read!n*' on)erted to)o%ta*euns!*ned%on*sr4es!stan'eN $$ T#e )o%ta*e' on)erted to res!stan'e ' an be )eryb!* so (ae%o uns!*ned%on*srCondu'tan'eN%on*sror'eN $$ !na%%y t#e res!stan'e ' on)erted to or' e

)o!d setupB)o!dDO.er!a%&be*!nB9600DN $$


18/25


sr8o%ta*eM (apBsr4ead!n*0 1023 05000DN .er!a%&pr!ntB8o%ta*eread!n* !n ( MDN .er!a%&pr!nt%nBsr8o%ta*eDN


19/25

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20/25

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21/25

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22/25

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23/25


sr4ead!n*$M 10N$$ T#e (ore you press t#e aster!tb%!ns; d!*!ta%e't#ard todebu* ! you arenEt e=pe't!n*!t;


24/25


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Buy an FSR

/ u y a n . 4 B#ttp:$$adaru &!t$166D
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Force Sensitive Resistor Fsr

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