AVT5789 LED dimming mai kulawa tare da firikwensin kusanci
Ana ba da shawarar direba don fitilun LED da wasu fitilun LED na 12V DC ba tare da ka'idodin halin yanzu da ƙarfin lantarki ba, da na gargajiya 12V DC halogen da fitilun incandescent. Kawo hannunka kusa da firikwensin yana kunna tsarin, a hankali yana haskaka tushen hasken da ke haɗe zuwa fitowar tsarin. Bayan kusancin hannaye, zai zama santsi, sannu a hankali.
Tsarin yana amsawa kusa da nesa daga nesa na 1,5 ... 2 cm. Tsawon lokacin aikin walƙiya da duhu yana kusan 5 seconds. Ana yin siginar gabaɗayan tsarin bayanin ta hanyar walƙiya na LED 1, kuma bayan an gama shi, LED ɗin za a kunna ta har abada. Bayan ƙarshen kashewa, LED ɗin zai kashe.
Gina da aiki
An nuna zane-zane na mai sarrafawa a cikin Hoto 1. An haɗa shi tsakanin wutar lantarki da mai karɓa. Dole ne a yi amfani da shi ta hanyar wutar lantarki akai-akai, yana iya zama baturi ko kowane tushen wuta tare da nauyin halin yanzu daidai da nauyin da aka haɗa. Diode D1 yana karewa daga haɗin wutar lantarki tare da polarity mara kyau. Ana ba da wutar lantarki na shigarwa zuwa stabilizer IC1 78L05, capacitors C1 ... C8 suna samar da madaidaicin tacewa na wannan ƙarfin lantarki.
Hoto 1. Tsarin Waya Mai Kulawa
IC2 ATTINY25 microcontroller ne ke sarrafa tsarin. Abunda mai kunnawa shine transistor T1 nau'in STP55NF06. An yi amfani da guntu na musamman na AT42QT1011 daga Atmel, wanda aka tsara a matsayin IC3, azaman mai gano kusanci. An sanye shi da filin kusanci ɗaya da fitarwa na dijital wanda ke nuna babban matakin lokacin da hannu ya kusanci firikwensin. Ana tsara kewayon ganowa ta hanyar ƙarfin capacitor C5 - ya kamata ya kasance cikin 2 ... 50 nF.
A cikin tsarin ƙirar, an zaɓi ikon don haka ƙirar ta amsa kusa da nesa daga nesa na 1,5-2 cm.
Shigarwa da daidaitawa
Dole ne a haɗa ma'aunin a kan allon da aka buga, zane-zane na taron wanda aka nuna a cikin Hoto 2. Ƙungiyar tsarin yana da mahimmanci kuma bai kamata ya haifar da matsala ba, kuma tsarin yana shirye nan da nan don aiki bayan taro. A kan fig. 3 yana nuna hanyar haɗi.
Shinkafa 2. PCB layout tare da tsara abubuwa
Ana amfani da shigarwar firikwensin kusanci mai alamar S don haɗa filin kusanci. Wannan dole ne ya zama saman kayan aiki, amma ana iya rufe shi da abin rufe fuska. Dole ne a haɗa tantanin halitta zuwa tsarin tare da mafi ƙarancin kebul mai yuwuwa. Kada a sami wasu wayoyi masu ɗaukar hoto ko saman kusa. Filin da ba a tuntuɓar ba zai iya zama abin hannu, abin rikewa na karfe ko bayanin martaba na aluminum don tube LED. Kashe wutar tsarin kuma a sake kunnawa duk lokacin da ka maye gurbin ɓangaren filin taɓawa. Ana yin wannan larura ta gaskiyar cewa nan da nan bayan an kunna wutar lantarki za'a bincika ɗan gajeren lokaci da daidaita firikwensin da filin kusanci.
Hoto 3. Tsarin haɗin mai sarrafawa
Duk sassan da ake buƙata don wannan aikin an haɗa su a cikin kayan AVT5789 B don PLN 38, ana samun su a:
