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Da 3: receptor/emisor IR

Los l ed infrarrojos s e caracterizan por emitir radiacin electromagntica, invisible al ojo humano, ya que su

longitud d e o nda e s m ayor a l a d el espectro v isible.

Para comprobar si un led IR funciona p odemos m irarlo a t ravs de la c mara d e n uestro m vil, ya q ue

este tipo d e c maras si que detectan rad iacin infrarroja.

http://www.davidmiguel.com/arduino/wp-content/uploads/2013/03/arduinopna4602.gifhttp://www.davidmiguel.com/arduino/wp-content/uploads/2013/03/arduinopna4602.gif

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Los r eceptores de infrarrojos son u nos p equeos integrados que p oseen u na foto-clula q ue detecta

emisiones infrarrojas. En e l siguiente d iagrama de bloques p odemos ver su funcionamiento:

PIN: sensor de infrarrojos (foto-diodo), convierte la seal luminosa incidente en seal elctrica. AGC (control automtico de ganancia): proporciona una seal de salida constante. Si la seal de

entrada e s pe quea, aumenta la g anancia y vi ceversa. Band Pass (ltro paso banda): ltra las f recuencias n o deseadas (E j: luz v isible). Demodulator (demodulador): r ecupera la informacin transportada p or la o nda p ortadora. Botn transistor: invierte la seal. Si del demodulador sale un 1, la salida se conecta a masa. Por

lo tanto, si no recibimos n ada, la s alida va a ser 5V.

*Para q ue el receptor se co mporte b ien, el led IR que u semos tiene q ue tener l a longitud de onda a la c ual

es m s sen sible e l sensor. La ms com n es 94 0nm. Podemos en contrar estos da tos en el datasheet de

los com ponentes.

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Existen multitud de dispositivos que utilizan tecnologa infrarroja para control remoto, por ej emplo los

mandos d e las televisiones. Su funcionamiento se basa en la emisin de secuencias de pulsos de luz IR

que t ransportan u n c digo d e N bits q ue identica la t ecla p ulsada.

Existen muchos p rotocolos de comunicacin infrarroja, nos va mos a c entrar en el protocolo NEC , que e s

el que u san los m andos un iversales.

El protocolo N EC utiliza pulsos d istancia para l a t ransmisin de u n m ensaje. Este p rotocolo funciona a una

frecuencia de 38kHz, es decir, los pulsos d uran 562.5 s. El mensaje se transmite de la siguiente forma: 0 lgico : Enva u n pulso d e 5 62,5 s, seguido de un espacio de 5 62,5 s de duracin (tiempo

de transmisin de 1,125 ms) 1 lgico: Enva un pulso de 562,5 s segu ido de u n e spacio de 1 .6875 m s de duracin (tiempo

de transmisin de 2 ,25 ms)

Cuando pulsamos un botn de un mando, se en va la si guiente cad ena d e p ulsos:

1. Una rfaga de pulsos de 9 ms.

2. Un espacio 4,5 ms

3. La direccin para e l dispositivo receptor (8 bits)

4. El inverso l gico d e la d ireccin (8 b its) (para comprobar errores)

5. El comando (8 bits)6. El inverso lgico del comando (8 bits)

7. Un pulso de 5 62.5 s para indicar el nal de la transmisin del mensaje.

A continuacin se i lustra co n una imagen para u na direccin 00000000 y u n co mando 1 0110101:

http://wiki.altium.com/display/ADOH/NEC+Infrared+Transmission+Protocolhttp://wiki.altium.com/display/ADOH/NEC+Infrared+Transmission+Protocol

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Vamos a empezar con una prctica sencilla que nos va a permitir comprobar el correcto funcionamiento

de n uestro rece ptor. Realizamos e l siguiente m ontaje:

Como hemos m encionado a ntes, si no mandamos n ingn pulso a l receptor, la sa lida de este tendra q ue

dar 5V. Sin e mbargo, si apretamos u n b otn de un mando a d istancia, el led debera p arpadear por unos

instantes, ya que cuando recibe un pulso, la salida se pone a 0V. Si ocurre esto, nuestro receptor funcionacorrectamente.

El siguiente c digo nos pe rmite registrar la su cesin de pulsos que m anda un mando cuando p ulsas u n

botn. Adems t e p repara e l cdigo para q ue lo puedas implementar, como ver emos a continuacin. No

vamos a explicar este cdigo , ya que es b astante complejo, nos l imitaremos a utilizarlo.

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/* Raw IR decoder sketch!This sketch/program uses the Arduno and a PNA4602 todecode IR recei ed This can "e used to make a IR recei er#"$ %ooking &or a particu%ar code'or transmitter #"$ pu%sing an IR () at +,-. &or thedurations detected1ode is pu"%ic domain check out www %ad$ada net and ada&ruit com&or more tutoria%s!*/

// 3e need to use the raw pin reading methods// "ecause timing is er$ important here and the digita%Read#'// procedure is s%ower!//uint-5t IRpin 27// igita% pin 82 is the same as Pin 2 see// http9//arduino cc/en/ acking/Pin:apping;6- &or the raw pin mapping8de&ine IRpin5PIN PIN8de&ine IRpin 2

// the ma mi%%iseconds is a %ong time8de&ine :A?P@( ) 6>000

// what our timing reso%ution shou%d "e %arger is "etter// as its more precise = "ut too %arge and $ou wont get// accurate timing8de&ine R) B(@TIBN 20

// we wi%% store up to ;00 pu%se pairs #this is =a %ot='uint;65t pu%sesC;00DC2D7 // pair is high and %ow pu%se

uint-5t currentpu%se 07 // inde< &or pu%ses we re storing

https://github.com/adafruit/Raw-IR-decoder-for-Arduinohttps://github.com/adafruit/Raw-IR-decoder-for-Arduinohttp://arduino.cc/en/Hacking/PinMapping168https://github.com/adafruit/Raw-IR-decoder-for-Arduinohttp://arduino.cc/en/Hacking/PinMapping168

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oid setup# oid' E eria% "egin#F600'7 eria% print%n#GRead$ to decode IR!G'7H

oid %oop# oid' E

uint;65t highpu%se %owpu%se7 // temporar$ storage timing highpu%se %owpu%se 07 // start out with no pu%se %ength

// whi%e #digita%Read#IRpin'' E // this is too s%ow! whi%e #IRpin5PIN #; JJ IRpin'' E // pin is sti%% IK

// count o&& another &ew microseconds highpu%seLL7 de%a$:icroseconds#R) B(@TIBN'7

// I& the pu%se is too %ong we timed out = either nothing // was recei ed or the code is &inished so print what // we e gra""ed so &ar and then reset i& ##highpu%se M :A?P@( )' #currentpu%se ! 0'' E printpu%ses#'7 currentpu%se 07 return7 H H // we didn t time out so %ets stash the reading pu%sesCcurrentpu%seDC0D highpu%se7

// same as a"o e whi%e #! #IRpin5PIN 5 O#IRpin''' E

// pin is sti%% (B3 %owpu%seLL7 de%a$:icroseconds#R) B(@TIBN'7 i& ##%owpu%se M :A?P@( )' #currentpu%se ! 0'' E printpu%ses#'7 currentpu%se 07 return7 H H pu%sesCcurrentpu%seDC;D %owpu%se7

// we read one high=%ow pu%se success&u%%$ continue! currentpu%seLL7

H oid printpu%ses# oid' E eria% print%n#G n r n rRecei ed9 n rBQQ tBNG'7 &or #uint-5t i 07 i J currentpu%se7 iLL' E eria% print#pu%sesCiDC0D * R) B(@TIBN )1'7 eria% print#G usec G'7 eria% print#pu%sesCiDC;D * R) B(@TIBN )1'7 eria% print%n#G usecG'7 H

// print it in a arra$ &ormat eria% print%n#Gint IRsigna%CD EG'7 eria% print%n#G// BN BQQ G'7 &or #uint-5t i 07 i J currentpu%se=;7 iLL' E

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// eria% print#G tG'7 // ta" eria% print#Gpu%seIR#G'7 eria% print#pu%sesCiDC;D * R) B(@TIBN )1'7 eria% print#G'7G'7 eria% print%n#GG'7 // eria% print#G tG'7 eria% print#Gde%a$:icroseconds#G'7 eria% print#pu%sesCiL;DC0D * R) B(@TIBN )1'7 eria% print%n#G'7G'7

H // eria% print#G tG'7 // ta" eria% print#Gpu%seIR#G'7 eria% print#pu%sesCcurrentpu%se=;DC;D * R) B(@TIBN )1'7 eria% print#G'7G'7

H

Si cargamos el cdigo en nuestro Arduino y a brimos la consola, nos d ir que est listo para decodicar IR.

Entonces t enemos q ue pulsar el botn que d eseamos y n os a parecer la relacin de tiempos de los

diferentes pulsos y a dems nos l os preparar para poder implementarlo en nuestro p rograma.

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Ahora q ue tenemos la se cuencia d e p ulsos qu e e mite e l mando al pulsar un botn determinado, podemos

reproducir ese botn gracias a A rduino y a un led IR. Este s e c onecta como un led normal:

Vamos a reutilizar parte del cdigo que utilizamos p ara la prctica del monitor serie. Los p ulsos va n a ser

enviados c uando p ulsemos l a b arra e spaciadora e n e l monitor. En la funcin emitirPulsos() pegaremos

el cdigo que n os ha proporcionado e l programa a nterior.

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/*(ed IRApaga $ enciende una te%e isi n mediante un %ed IR*/

int %edIR ;,7 // ec%aro pin para e% %ed IR

oid setup#' Epin:ode#%edIR B@TP@T'7 //1on&iguro e% pin ;, como sa%idaeria% "egin#F600'7 //Inicio %a comunicaci n serieeria% print%n#G %ed IR G'7eria% print%n#G**********************************G'7eria% print%n#G* 1ontro% TO9 *G'7eria% print%n#G**********************************G'7eria% print%n#G* )ncender/Apagar9 *G'7eria% print%n#G* "arra espaciadora *G'7eria% print%n#G**********************************G'7H

oid %oop#'E int serie7 //A%maceno %os datos Sue %%eganpor serie

whi%e # eria% a ai%a"%e#' M 0'E //1uando ha$ datos para %eer

serie eria% read#'7 //(eo esos datos

switch#serie'E case 9 // arra espaciadora emitirPu%sos#'7 //(%amo a %a &unci n Sue emite %os pu%sos eria% print%n#G)n iado!G'7 de%a$#2000'7 "reak7

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de&au%t9 // i es otra cosa "reak7 //no hago nada H HH

oid emitirPu%sos#'E /*ASu pegamos e% c digo proporcionado por e% anterior programa*/ pu%seIR#-0'7 de%a$:icroseconds#U;40'7 pu%seIR#60'7 de%a$:icroseconds#U-20'7 pu%seIR#-0'7 de%a$:icroseconds#4240'7 pu%seIR#;00'7 de%a$:icroseconds#U200'7 pu%seIR#-0'7 de%a$:icroseconds#;460'7 pu%seIR#-0'7

de%a$:icroseconds#6,40'7 pu%seIR#-0'7 de%a$:icroseconds#;;>40'7 pu%seIR#60'7 de%a$:icroseconds#2-0'7 pu%seIR#;20'7 de%a$:icroseconds#>U60'7 pu%seIR#60'7 de%a$:icroseconds#2;60'7 pu%seIR#;20'7 de%a$:icroseconds#;60'7 pu%seIR#;00'7 de%a$:icroseconds#;;U40'7

pu%seIR#;40'7 de%a$:icroseconds#>-0'7 pu%seIR#60'7 de%a$:icroseconds#>440'7 pu%seIR#2-0'7 de%a$:icroseconds#F600'7 pu%seIR#;60'7 de%a$:icroseconds#2-40'7 pu%seIR#;60'7 de%a$:icroseconds#F420'7 pu%seIR#;00'7 de%a$:icroseconds#;0220'7 pu%seIR#-0'7

de%a$:icroseconds#>420'7 pu%seIR#;20'7 de%a$:icroseconds#4U20'7 pu%seIR#4-0'7 de%a$:icroseconds#;02-0'7 pu%seIR#60'7 de%a$:icroseconds#,2-0'7 pu%seIR#-0'7 de%a$:icroseconds#,-;00'7 pu%seIR#;40'7 de%a$:icroseconds#2>>20'7 pu%seIR#-0'7 de%a$:icroseconds#;2400'7

pu%seIR#60'7 de%a$:icroseconds#40U-0'7 pu%seIR#;20'7

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de%a$:icroseconds#;60'7 pu%seIR#-0'7 de%a$:icroseconds#,FF-0'7 pu%seIR#60'7 de%a$:icroseconds#4420'7 pu%seIR#60'7

de%a$:icroseconds#;;F60'7 pu%seIR#60'7 de%a$:icroseconds#-U-0'7 pu%seIR#-0'7 de%a$:icroseconds#UF60'7 pu%seIR#60'7 de%a$:icroseconds#;2;60'7 pu%seIR#;00'7 de%a$:icroseconds#42220'7 pu%seIR#-0'7 de%a$:icroseconds#,-F,2'7 pu%seIR#;00'7 de%a$:icroseconds#,>40'7

pu%seIR#-0'7 de%a$:icroseconds#>;F40'7 pu%seIR#;00'7H oid pu%seIR#%ong microseg'E /*Kenera %os pu%sos de ,-. de &recuencia durante < microsegundos VParWmetros9 microseg*/

c%i#'7 // desa"i%itamos cua%Suier interrupci nwhi%e #microseg M 0' E /*,-. son apro< ;,microseg en IK $ ;,microseg en (B3

%a instrucci n digita%3rite tarde ,microseg en eXecutarse por %o Sue hacemos dos de%a$s de ;0 en e de ;, )n tota% e% cic%o dura 26microseg cuando se comp%eta restamos a% tiempo Sue tiene Sue estar mandando e% pu%so*/digita%3rite#%edIR IK '7de%a$:icroseconds#;0'7digita%3rite#%edIR (B3'7de%a$:icroseconds#;0'7microseg = 267Hsei#'7 // acti a %as interrupcionesH

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F"R #$C Protocol Ba ed Remote Control for thi Bord

Remote %ontrol *or his 0oard

#$C Infrared Protocol

http://www.circuitvalley.com/2013/09/nec-protocol-ir-infrared-remote-control.htmlhttp://www.circuitvalley.com/2013/09/nec-protocol-ir-infrared-remote-control.html

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2 &its *or the address (address > inverse) re?uire 6 inverse)

also re?uire 6 address inverse) or (command>command inverse) willalwa"s contain 4 9 9s and 4 929s so (4 @ 2.26,ms) > (4 @ 6.6,ms) AA 6 .,ms>66

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the image give &low is ta e &" Rigol DB2 ,6$Cscilloscope

'o&ic naly er how the timin& detail 2 leading pulse at 4 .22,ms 6 space on 13.64ms 3 +ddress starts at 1

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he #$% protocol is so widel" used that soon all possi&le addresseswere used up. 0" sacri=cing the address redundanc" the address range wase tended *rom 6, possi&le values to appro imatel" , di erent values.

his wa" the address range was e tended *rom 4 &its to 2 &its withoutchanging an" other propert" o* the protocol. he command redundanc" is

still preserved. here*ore each address can still handle 6, di erentcommands.in e tended protocol instead o* sending address and addressinverse we send address low and address high as shown in the image &low.

Repeat Codes

If the key on the remote controller is kept depressed, a repeat code will be issued,typically around 40ms after the pulse burst that signified the end of the message. A repeat codewill continue to be sent out at 108ms intervals, until the key is finally released. he repeat codeconsists of the following, in order!

A "ms leading pulse burst A #.#$ms space A $%#.$&s pulse burst to mark the end of the space 'and hence end of the transmitted repeat

code(.the figures give blow show the timing of repeat codes

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if user keeps the key depressed the repeat codes keep coming

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8 shows the timing of repeat code

Decoding NEC Protocol with microcontroller)ecoding *+ is really easy ,there are certainly various methods to do, some e-amples i

have see n used polling method in which the firmware keep polling the input pin of microcontroller which connects to I sensor , other method is to user interrupt ,inthis demonstration we will be using the interrupt method as this one is better, we will be usinginterrupt on change.

Schematic :

SOFTWARE

Git !" Repo

Clic# here DOWN$OAD T E SO%RCE CODE & F'R(WARE And Schematic

https://github.com/circuitvalley/IR-Remote-Controlhttps://sites.google.com/site/microembededfiles/home/september-2012/NEC%20IR%20REMOTE.zip?attredirects=0&d=1https://github.com/circuitvalley/IR-Remote-Controlhttps://sites.google.com/site/microembededfiles/home/september-2012/NEC%20IR%20REMOTE.zip?attredirects=0&d=1

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PROTOT)PE

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http!//www.circuitvalley.com/#01#/0"/infrared ir nec microcontroller pic avr.html

EXTRAER DIRECCION Y COMANDO

#include #use delay(clock=20000000)#fuses N !" $%&$ ' $ N ' *+ $ , !N $ -+ $ N /'$ N +'"

oid e 3 + ( oid)5

#define 3 N' ' N3,0 77 he "ecode9 has o :e connec ed o anin e99u; ;in

#define 3& A & ( in;u ( 3 N' )) 77 in e9 si nal f9o ecei e9

y;edef s 9uc in 8 da a?2@5in 8 s a e5

9c 3s 9uc 5

http://www.circuitvalley.com/2012/09/infrared-ir-nec-microcontroller-pic-avr.htmlhttp://www.circuitvalley.com/2012/09/infrared-ir-nec-microcontroller-pic-avr.html

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9c 3s 9uc 9c 5

77 in e99u; func ion fo9 eB e9nal in e99u; ;in#in 3*C *C 3is9() e 3 + ()5

77 + decodinin 1 e 3 + ( oid) in 16 ;$ 5 in i5 in 1 in;5

se 3 i e91(0)5 77 9ese i e9 Dhile( 3& A &==1)5

= e 3 i e91()5

if ((

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;= ; E 0B 0005 77 clea9 ,i s 1 $14 I 1

;= ; I 0B Hff5 77 cu off o le:i

9c .da a?0@= ; I 0Bff5 77 eB 9ac de ice add9ess

;>>=85

9c .da a?1@= ; I 0Bff5 77 eB 9ac co and code

9c .s a e = 15 77 se fla fo9 successful co and decodin

disa:le3in e99u; s( N 3*C )5 77 disa:le n e99u; s un il 9ecei edco and has :een ;9ocessed

9e u9n 15

oid ain() 77 con 9olle9 ini ialisie9en se u;3 i e930( ++3 N * NA E ++3" /31)5 se u;3 i e931( 13 N * NA E 13" /3,J38)5 77 i e91 is used fo9 +decodin . !hen he chi; 9uns K 20-%L$

77 a ;9escale9 of 8 has o :e used

se u;3 i e932( 23" &A, *"$0$1)5 se u;3co ;a9a o9(N+3N+3N+3N+)5 se u;3 9ef(FA &*)5

77 ena:le in e99u; sena:le3in e99u; s( N 3*C )5

ena:le3in e99u; s(M ,A )5

9c .s a e = 05

Dhile(1) if(9c .s a e==1) 77 did De 9ecei e a alid co and

9c .s a e = 05

;9in f(O"e iceP QuRnO$ 9c .da a?0@)5 77 dis;lay de ice add9ess ;9in f(O+o andP QuRnO$ 9c .da a?1@)5 77 dis;lay co and code

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ena:le3in e99u; s( N 3*C )5 77 9eena:le in e99u; s

http://www.microchip.com/*orums/m, 122 .asp

)escription

This project shows how to decode IR remote controls which use RC5 code with a PIC

microcontroller.

With being able to read IR remote control command it is possible to use standard remote

controls as input device for a microcontroller.

$ asics

n 9oduc ion

The RC5 protocol was developed by Philips as consumer IR infrared! remote control

communication protocol for consumer electronics.

"a a Fo9 a

The RC5 code is "# bits long. $ach code includes % start bits& " toggle bit& a 5 bit address or

system! and a ' bit command. This allows for (% systems li)e T*& C+& video& etc.! and '#

commands per system.

http://www.microchip.com/forums/m509110.aspxhttp://www.microchip.com/forums/m509110.aspx

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The two start bit indicate the start of the RC5 frame.

Note:

Af e9 so e i e 64 co ands ;e9 sys e didnS see o :e enou h hou h$ so an eB 9a

co and :i Das added o alloD 128 co ands. o ain ain :ackDa9d co ;a i:ili y Di h

he s anda9d + $ he fo9 a i self Das lef unchan ed. he second s a9 :i (&2) Das

9e;laced :y +6. he 9esul in fo9 a is called *B ended + .

The toggle bit T changes each time a new command is transmitted. It allows detection if the

same )ey is pressed twice. ,ince a code is being sent as long as the )ey is pressed& a short

release of the button and again pressing it again would otherwise not be recogni-ed.

The address bits 5.. / specifies the system or device! the command shall be sent to& e.g.

T*& C+& *ideo& etc.

0inally& the command bits specify the command to be performed.

-odula ion

RC5 uses 1anchester coding. 1anchester coding has a transition in the middle of a bit.

logical " is coded as a / in the first half of the bit and a " in the second half of the bit.

logical / is coded as a " in the first half of the bit and a / in the second half of the bit.

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Important hint:

-os of he ecei e9s (e. . he &F% 110 o9 & '1H 6) ha e an in e9 ed ou ;u &o a

lo ical 1 a he ou ;u of he ecei e9 Dill :e 9e;9esen ed :y a 1 in he fi9s half of he :i

and a 0 in he second half$ a lo ical 0 Dill :e 9e;9esen ed :y 0 in he fi9s half of he :i and

a 1 in he second half.

+ *Ba ;le

In the e2ample below an e2ample of an RC5 code which shows how the information is coded.

In this e2ample the toggle bit is /& the address is also / and the command is 3& i.e. )ey 434

has been pressed.

2ardware

s IR Receiver I used a ,065""/ (' which is a IR Receiver for Remote Control ,ystems. lso

other IR Receivers li)e& a ,065/' (' or T,7P"8(' will wor). Important is that the IR

Receiver is designed for a carrier fre9uency of (')6- which is the carrier fre9uency used by

RC5!.

The interface to the PIC microcontroller is very simple& the output of the IR Receiver just

needs to be connected to an :interrupt on change: pin. I used a PIC"'0;;' where port < has

:interrupt on change: capability& so I connected it to port pin R

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3oftware

The RC5 software driver is written in C language and currently is compatible to CC, C

compiler and 1icrochip C"; compiler.

"ecodin

The decoding happens in the interrupt service routine of the :on change: interrupt of port

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@ow we need to add the interrupt handler which calls the RC5 decoding function of the RC5

driver. The decoding function is RC5_InterruptHandler() .

/*****************************************************************************//* Interrupt5R*//**//* Port change interrupt ser ice routine*//* @sed to decode R1> IR signa%*//*****************************************************************************/8INT5Roid Interrupt5R # oid 'ER1>5Interrupt and%er#'7c%ear5interrupt#INT5R '7H

nd finally& we need to configure the timer / which will be the time base for the RC5

decoding function and enable the :on change: interrupt.

/* QB 1/4 is timer source *//* QB 1 20: M >: i e timer increment e er$ t ;/#QB 1/4' 200ns *//* with presca%er o& ;2- timer wi%% increment e er$ 2> 6us */setup5timer50#RT115INT)RNA(YRT115 IO5;2-'7/* con&igure port interrupt on change */set5tris5"#0

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/*** QI() )A )R****************************************************************** QI()NA:)9 rc>demo c* AT)9 26 0U 20;;* A@T BR9 1hristian tad%er** ) 1RIPTIBN9 R1> demo which shows usage o& R1 decoder dri er*******************************************************************************//* make compi%er case sensiti e */8pragma case8inc%ude 8inc%ude Gt$pes hG/* === R1> dri er con&iguration === */8de&ine R1>5 ATA5PIN PIN5 ; /* IR sensor # Q >;;0=,6'connected to R ; */8de&ine R1>5TI1. 5P)R5: #;000/26' /* timer increments e er$

2> 6us *//* i e around ,F ticks per mi%%isecond */8de&ine R1>5KetTimer#' get5timer0#' /* timer0 sha%% "e used&or R1> decoding */8inc%ude Grc> hG /* R1> dri er inc%ude *//* === macros to switch on/o&& () === */8de&ine (ed5Bn#' output5high#PIN5A0'8de&ine (ed5B&' output5%ow#PIN5A0'/*****************************************************************************//* Interrupt5R*/

/**//* Port change interrupt ser ice routine*//* @sed to decode R1> IR signa%*//*****************************************************************************/8INT5Roid Interrupt5R # oid 'E(ed5Bn#'7

R1>5Interrupt and%er#'7c%ear5interrupt#INT5R '7(ed5B&'7H/*****************************************************************************//* main*//**//* 1on&igures timer0 as time "ase &or R1> decoding and ena"%es port */

/* interrupt on change*/

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/* :ain %oop checks i& a R1> code has "een recei ed and writes thecode *//* to the R 2,2 inter&ace*//*****************************************************************************//* NBT)9 1urrent%$ it on%$ works i& PI1 is reset a&ter programmingZ */oid main#'Euint;6 rc>code7/* QB 1/4 is timer source *//* QB 1 20: M >: i e timer increment e er$ t ;/#QB 1/4' 200ns *//* with presca%er o& ;2- timer wi%% increment e er$ 2> 6us */setup5timer50#RT115INT)RNA(YRT115 IO5;2-'7/* con&igure port interrupt on change */set5tris5"#0 1ode 0code'R1>5KetTogg%e it#rc>code'R1>5Ket1md#rc>code''7H/* this &unction increments the R1> timeout timer *//* NBT)9 ecoding wi%% a%so work without ca%%ing this &unction "ut *//* it cou%d happen that R1> codes are sometimes not getting *//* recogni ed "ecause o& decoding state machine stucks due *//* to erroneous R1> signa% */R1>5TimeoutIncrement#'7H

H

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)ownload

+emo project CC, C Compiler!D rc5AdecoderAccsA"""/"'.-ip +emo project 1icrochip C"; Compiler!D rc5AdecoderAc";A"""/"3.-ip +river source code CC, C Compiler& 1icrochip C"; Compiler!D rc5.h

http://mem&ers.aon.at/electronics/pic/pro!ects/rc,Edecoder/inde .html

http://members.aon.at/electronics/pic/projects/rc5_decoder/rc5_decoder_ccs_111016.ziphttp://members.aon.at/electronics/pic/projects/rc5_decoder/rc5_decoder_c18_111019.ziphttp://members.aon.at/electronics/pic/projects/rc5_decoder/rc5.hhttp://members.aon.at/electronics/pic/projects/rc5_decoder/index.htmlhttp://members.aon.at/electronics/pic/projects/rc5_decoder/rc5_decoder_ccs_111016.ziphttp://members.aon.at/electronics/pic/projects/rc5_decoder/rc5_decoder_c18_111019.ziphttp://members.aon.at/electronics/pic/projects/rc5_decoder/rc5.hhttp://members.aon.at/electronics/pic/projects/rc5_decoder/index.html