Elektronik ve İşlemciler_ Atmega8 ve RS232 ile 3 Renkli LED Modül Sürülmesi.pdf

7/25/2019 Elektronik ve lemciler_ Atmega8 ve RS232 ile 3 Renkli LED Modl Srlmesi.pdf

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ktronik ve lemciler: Atmega8 ve RS232 ile 3 Renkli LED Modl Srlmesi

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Elektronik ve lemcilerGelien mikrokontrol teknolojileri ve artan bilgi birikimi sayesinde gelitirici dzeyinde dahayaygn kullanmna olanak tanmtr. Burada elimden geldii kadar bazrnekler sunmaya

alacam...

27 ubat 2010 Cumartesi

Atmega8 ve RS232 ile 3 Renkli LED Modl

Srlmesi

Giri

LED k kaynaolarak kullanlan elektronik elemanlardan biridir. Gnmzdeinsan gz iin grnr ve grnmez dalga boylardahil birok renkteretilmektedir. yle ki gemite k kaynaolarak souk katot ve flresantpleri kullanlan tarayclar iin dahi gnmzde LED'ler kullanlmaktadr.zerinde taraycbulunan bir mrekkep pskrtmeli yazcdan sklmbirLED k kaynann Atmega8 ilemcisi yardmyla bilgisayar zerindenkontrol zerinde alacaz. (Ne yazk ki o kadar kolay bozuluyorlar ki,cihazzerindeki blmlerden biri bozulunca her ikisi de kullanm dkalyorlar.)

LED

TrkeIk Yayan Diyotolarak aabileceimiz bu eleman dk gle kretebilen uzun mrl elektronik elemanlardr.
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2/12



ekil-1:Led'ler

LEDler geliimi hakknda daha ncelerine ait bilgiler bulunsa da, gnmzdekullanlan LEDlerin 60'lyllarda gelitirildiini syleyebiliriz. Krmzrenkblgesinde yer alan LED GaAsP bileiminde Galyum-Arsenik taban zerineFosfor eklenmesi ile elde edildi. 70'li yllara doru turuncu, sarve yeil renkliLEDler gelitirildi. 70'li yllarn ortalarna doru mavi renkli k yayabilenLED'ler gelitirildi.

Tabii ki ilk gelitirilen LED'lerin verimlilii fazla deildi ama o yllardakullanlan sistemlere gre olduka verimliydiler.

Gnmzde ise byk LED Televizyonlar, reklam tabelalar, trafik klar, ceptelefonlarnn arka plan aydnlatmalar, hatta lamba ve el feneri gibi biroksaysz uygulamasvar.

LED basit bir anlamda bir diyottur. Devreye iletim ynnde balanr. LEDzerine uygulanan gerilim eik seviyesine ulatzaman akm akmaya balar veLED k vermeye balar. Bu noktada dikkat edilecek konu akm miktardr.Eer akm artarsa LED bozulur ve yanar. Bu nedenle LED elemanlardaimaakm snrlama elemanolarak seri bir diren ile akm snrlamaya gereksinimduyar.
http://4.bp.blogspot.com/_mKk1EG_cc4c/S4i6-OSRKiI/AAAAAAAAA2c/pFy4o635hjg/s1600-h/M8_3renk_led_ledlbar.jpghttp://1.bp.blogspot.com/_mKk1EG_cc4c/S4i6itfoeOI/AAAAAAAAA2U/RFAQXmqKhhM/s1600-h/M8_3renk_led_ledler.jpg


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ekil-2:Kullanlan LED rnei.(Aslnda baka bir yazctipinde kullanlan LEDmodl)

Projede kullanlan LED zerinde yazc-taraycbulunan bir cihaz zerinden(taraycblm) k tarama kafasblmnden elde edildi. ekil 1 bu parannsadece LED'ler grlecek ekilde resimde gsterilmektedir.

ekil-3:In yaylmasiin optik klavuz kanal

Bu sistemde kullanlan LED bir dizi halinde deil. Sadece 3 adet led var. BuLED'lerin klavuz bir optik kanal iinden genibir yzeyden darkar. Buda bir k ubuu olarak grlmesini salar.

Ikta Renkler ve LEDlerdeki Durumu

Ik ile renklerin elde edilmesi biraz deiik bir konudur. O veya bu ekilde boyaile ilgilenenler bilir. Sar, krmzve mavi renkleri (aslnda cyan, magenta vesar) kullanarak istedikleri renkleri kolaylkla elde edebilirler. Gazete, dergi veafiler (hatta evinde suluboya ile uraanlar) buna ok iyi rneklerdir.

ekil-4:Renkli klarn bileimindeki renkler

Ik ile renklerin elde edilmesinde ise krmz, mavi ve yeil renkler ile dier tmrenkler elde edilebilir. Eer bilgisayar ekranve televizyon ekrannyakndaninceleme ansnbulursanz grnt elde etmek iin 3 renk ieren noktalarolduu greceksiniz. Bunlar birincil renklerdir. birincil renk st ste bindiizaman cyan, magenta ve sarortaya kar. birden beyaz, (RGB renkmodeli).
http://4.bp.blogspot.com/_mKk1EG_cc4c/S4i7_n9_SgI/AAAAAAAAA2s/9jfhSf_zpkA/s1600-h/M8_3renk_led_renkler.jpghttp://4.bp.blogspot.com/_mKk1EG_cc4c/S4i7QywedQI/AAAAAAAAA2k/xb9zPYGyy8M/s1600-h/M8_3renk_led_cubuk.jpg


4/12



ekil-5:Darbe geniliine gre parlaklk deiimi

Projede k kaynaolarak kullanlan LEDlerde parlaklk(k miktar) ayarzerinden geen akm ile kontrol edilir. Ama bu yntemin kontrolu biraz zordurve analog devre gerektirir. Saysal sistemlerde ise bu akm sabit olmak zereLEDin a ve kapatma ile kontrol edilir. Yani LEDin ak ve kapalkalma srelerikontrol edilerek istenen etkiyi yaratr. Bu ynteme darbe genilik modlasyonuolarak tanmlayabiliriz. Burada gz nne alnacak nokta a ve kapat srelerinintoplamnn sabit olmasgerektiini dikkate almak gerekir.(Frekans sabit)

ekil-6:Srlen LED'lere gre k deiimi (rnek) Darbeler k rengine gresralanm, alttaki kutucuklarda gsterilen renkleri belirtir.

Biraz basite indirgersek LED ekranlarn temelini oluturuyor. Yani bu modlgibi yzlercesi belki binlencesi ile bir LED ekran oluturulabilir. Bir yere kadar.

Devre

RS232 modl ile ilemci modl arasndaki balantIDC10 konnektrlerzerinden 10 yollu kablo zerinden veri ve beslemme balantsnoluturur.LED kartile ilemci arasndaki balant4 kablo balantsile salanyor.(Renkler o LED'e gre kablo rengi taklmtr. Mor renkli kablo hari. O Vcc

balantsiin kullanld.

Sistem bir adaptr zerinden alnan besleme gerilimi 7805 zerinden 5Vbesleme gerilimi retiliyor.

ekil-7:LED kartnn kablo balantular.
http://3.bp.blogspot.com/_mKk1EG_cc4c/S4i9DekbR_I/AAAAAAAAA3M/F9ptdKfOV0U/s1600-h/M8_3renk_led_calis.jpghttp://2.bp.blogspot.com/_mKk1EG_cc4c/S4i8i-DIkVI/AAAAAAAAA28/qXkDGzLgJ1k/s1600-h/M8_3renk_led_darbeRenk.jpghttp://4.bp.blogspot.com/_mKk1EG_cc4c/S4i8S-1OwpI/AAAAAAAAA20/1e-yKi7Gci8/s1600-h/M8_3renk_led_darbe.jpg


5/12



Kartlarn ve kablolarn balantlarhakknda balk altndaki resmi ve ekil-8bir fikir verecektir.

ekil-8:Sistem alrken.

ema

Atmel 8 ilemcimiz olan zere IC1 ile temsil ediliyor. lemciye balkristal, C5ve C6 kondansatrleri saat frekansreteci olarak alyor. D2(LED) ve R1sistem izleme gstergesi olarak alyor.(ama gelen veri o kadar az ki yanpsnd grlmyor).ISP konnektr artk bilinecei zere IC1 programlamaiin. R2,R3 ve R4 renkli ledleri srmede akm snrlama elemanolarakalyor. CLED olarak belirtilen LED'ler ubuk LED olarak tanmlanan elemaniinde yer alr. C8 ve C9 LED modl beslemesinde oluabilecek dalgalanmarszmek iin eklendi.

D1, C1,C2 ve IC2 sistem iin gereken 5V besleme devresini oluturuyor.

IC3,C12,C14...C16 kondansatr grubu RS232 balantsiin gereken blm

oluturuyor. DB9 P4 kondansatr bilgisayar RS232 balantsnsalyor.Buradaki R5,D3(LED) besleme gerilim geldii gsterir.

Geri kalan kondansatrler filtre iindir. emada ilemci kartile RS232 modlarasndaki balantda kullanlan konnektrler gsterilmemitir.

ekil-9:Blok emas
http://4.bp.blogspot.com/_mKk1EG_cc4c/S4i-D7pa4PI/AAAAAAAAA3c/vrvGVuYKwGU/s1600-h/M8_3renk_led_blok.jpghttp://4.bp.blogspot.com/_mKk1EG_cc4c/S4i8-N69TmI/AAAAAAAAA3E/Bu8_wNhn_48/s1600-h/M8_3renk_led_kartbagla.jpg


6/12



ekil-10:Devrenin emas(krmzizgi ile iaretli blge RS232 iletiimmodldr)

Devrenin almas

Devre ilk aldnda LED modl zerindeki LED'ler sndrlr. Bilgisayarprogramnda yer alan kaydrma ubuklarile belirtilen renkteki led bilgisiRS232 zerinden ilemci kartna gnderilir. Gelen bilgi Darbe genilikmodlasyonu iin darbe sresi olarak kullanlarak LED yanma sresini belirler.Gelen bilgiye gre yakp sndrlen LEDler bir renk karmoluturur.

ekil-11:LED Modl.

ekil-12:lemci Modl.

ekil-13:RS232 Modl.
http://1.bp.blogspot.com/_mKk1EG_cc4c/S4i-ms_QeBI/AAAAAAAAA3k/eT5zX1uyUjI/s1600-h/M8_3renk_led_rs232.jpghttp://4.bp.blogspot.com/_mKk1EG_cc4c/S4i-rZY8CyI/AAAAAAAAA3s/tgb1mbhfxio/s1600-h/M8_3renk_led_islemci.jpghttp://1.bp.blogspot.com/_mKk1EG_cc4c/S4i-v1qH6VI/AAAAAAAAA30/baEyoa8DWXQ/s1600-h/M8_3renk_led_ledKart.jpghttp://1.bp.blogspot.com/_mKk1EG_cc4c/S4i-AIBCohI/AAAAAAAAA3U/FrTT06Z1UGw/s1600-h/M8_3renk_led_semab.jpg


7/12



Devre Yapm

Devre yapmnda kritik bir eleman yok. Baskdevre kartzerindegeekletirildiinde standart eleman yerleimi gz nne alnarak devrekurulabilir. Bu noktada dier devre montaj teknikleri kullanldnda bacaklarndoru balanmasnemlidir. Tabii ki kristal topraklanmaldr.

Tm direnler eyrek vattr.

Besleme konusunda bir sorun oluturmayacanzdnyorsanz giritekikpry devre dbrakabilir veya tek bir diyotla deitiribilirsiniz. (Kendibesleme kaynanz varsa ve devreyi kendiniz kullanacaksanz). Bacakbalantlaruyan baka bir LED kullanlabilir. Entegreler iin soket kullanlmassonradan oluabilecek sorunlarn zmnde size yardmcolabilecektir.

LED modl ilemci modlne Tunik 4'l konnektr kullanlarak balantssaland. LED modl zerindeki ubuk LED ayaklarLehimlendikten sonra kartile LED ubuk arasnda biraz scak silikon sklmasmekanik dayankllk

salayacaktr.

ekil-14:Devrenin baskplan(eleman yznden grnd gibi)

ekil-15:Devrenin yerleim ekli(eleman yz)

ekil-16:Devrenin yerleim plan

Not:Baskdevrede* ile iaretli elemanlar kullanlmamaktadr. Bu elemanlar

RS232 modl bamsz olarak kullanlma durumunda kullanlmaktadr.Devre Elemanlar

470R R2,R3,R4
http://4.bp.blogspot.com/_mKk1EG_cc4c/S4i_cA45TgI/AAAAAAAAA38/LP_b09MPzJY/s1600-h/M8_3renk_led_birlikte.jpghttp://1.bp.blogspot.com/_mKk1EG_cc4c/S4i_f2zviuI/AAAAAAAAA4E/OO7ynZx3FjY/s1600-h/M8_3renk_led_eleman.jpghttp://2.bp.blogspot.com/_mKk1EG_cc4c/S4i_ig19m1I/AAAAAAAAA4M/irfU3E9ohCE/s1600-h/M8_3renk_led_pcb.jpg


8/12



1K R1,R5

27pF C5,C6

100nF C2,*C4,C7,C8,C10,C11,C13,C17

10F *C1,C3,C9,C12,C14,C15,C16,C18,*C19

B125C1500 veya benzeri D1,*D4

LED D2,D3

ubuk LED RGB LED

ATMEGA8 IC1

7805 IC2,*IC4

MAX232 IC3

3,6864Mhz kristal XT1

DB9 P4

6 Header (ISP6) ISP

4'l Tunik P12'li Klemens P2,*P5

10'lu kablo -

Malzeme listesi. Burada ilemci iin soket ve 9V adaptr verilmemitir. Kaliteli16 ve 28 bacaklsoketler oluabilecek problemlerin nne geecektir. 2'liklemens (P2)ve P3 ile P3-1 emada gsterilmemitir ve "*" ile iaretli elemanlarkullanlmamtr.

ekil-17:Devre alrken ubuk LED zerinde elde edilmirenkli kgrntleri

Bilgisayar Program

Bilgisayar zerinde kullanlan program Delphi 7 ile yazld. "LED_Renkli.exe"program2 ana pencereden oluuyor. Birinci pencere ayarlarn yapldpenceredir. Seri port seimi yaplr. kincisi Gsterilecek rengin deerlerininbelirlendii penceredir.
http://3.bp.blogspot.com/_mKk1EG_cc4c/S4jAlnFmOYI/AAAAAAAAA4U/QboQmQO1ElI/s1600-h/M8_3renk_led_ornek.jpg


9/12



Programaltrn ayarlar penceresinden alet baladnz RS232 portunu seinve Tamam butonuna tklayarak onaylayn. Ana pencere zerinde kaydrmaubuklarnfare ile hareket ettirerek istediiniz rengin LED ubuundagsterilmesini salayn. Alet ak kaldsrece ayarlanan renk kalacaktr.

Ana Pencere

ekil-18:Ana Penceresinin grnm

Bu pencere zerindeki eleri deinecek olursak;.

1. KrmzRengin belirlendii kaydrma ubuu.2. Krmzrengin belirlendii kaydrma ubuunun deeri3. Mavi Rengin belirlendii kaydrma ubuu.4. Mavi rengin belirlendii kaydrma ubuunun deeri5. Yeil Rengin belirlendii kaydrma ubuu.6. Yeil rengin belirlendii kaydrma ubuunun deeri7. Belirlenen renk deerlerine gre bilgisayarda rengin gsterilmesi(LED

ubuunda farklolabilir)8. Renk kaydrma ubuklarnsfr deerine eker9. Seenekler penceresini aar

Seenekler

ekil-19:Seenekler penceresi
http://1.bp.blogspot.com/_mKk1EG_cc4c/S4jBbO2umHI/AAAAAAAAA4k/byCnAuDrUSs/s1600-h/M8_3renk_led_secenek.jpghttp://2.bp.blogspot.com/_mKk1EG_cc4c/S4jA8rE5SLI/AAAAAAAAA4c/EdMig1Ucg0Y/s1600-h/M8_3renk_led_anaSay.jpg


10/12



Sonraki Kayt nceki Kayt

Seenekler penceresi zerindeki eleri deinecek olursak;.

1. Bilgisayara zerinde bulunan seri portlarlisteler ve bunlar arasndanbalantsyaplan port seilir.Seilen port numarasini dosyasnakaydedilir.(tamam butonu tklandktan sonra ayar onaylanr)

2. Bu pencerede yaplan ayarlaronaylar ve Ana pencereyi aar

Ekler:

ATMEGA8 hakknda bilgi

Atmega8 ve RS232 ile 3 Renkli LED Modl Srlmesi iin dosyalar- birleik

Bu devrenin yapm sorumluluu size aittir. Devre yapldve alyor. K.A....

GnderenAdil atczaman: 08:19Etiketler:Atmega8, avr, led, rs232

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11/12



Austos (1)

Temmuz (1)

Haziran (3)

Mays (1)

Nisan (4)

Mart (2)

ubat (5)

Atmega8 ve FT232BL (USB) ile 3 Renkli LED Modl S...Atmega8 ve RS232 ile 3 Renkli LED Modl Srlmesi

Atmega8 ve RS485 ile VFD Ekran Modl Srlmesi

Atmega8 ve FT232 ile VFD Ekran Modl Srlmesi

Atmega8 ile VFD Ekran Modl Srlmesi

Ocak (2)

2009 (22)

2008 (4)

HakkmdaAdilatc Takip et

8

Profilimin tamamngrntle

Etiketler93C46(5) at90S2313(7)

atmega16 (5) Atmega8 (44)attiny2313(18) avr(71)

FT232BL(9) grafik LCD(6)LCD

(22) led(8) led ekran(12) LM35(8)rs232 (16)

rs485(14) saat(14) termometre(13) USB(14)

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