Çocukluğumuzun meşhur dizisi Knight Rider yada kara şimşek’deki siyah arabanın önündeki led efektini sanırım hepimiz biliriz. Bu uygulamada B,C,D portları kullanarak 18 led ile yürüyen ışık devresi yapılmıştır. Kodlarda yapacağınız değişiklik ile led sayısını artırıp azaltabilirsiniz. PHP Kodu: #include <16f877.h>#fuses XT,NOWDT,NOBROWNOUT,NOLVP,NOPUT,NOWRT,NOCPD#use delay(clock=4000000)//Tüm programdaki gecikmeleri ayarlama#define gecikme 30 void main (){int i,j; while(1) { // İLERİYE SAYIM // B portu için j=1; //kaydırma işlemi için sayı değeri for(i=0;i<8;i++) { output_b(j); // j sayı değeri B portunda j=j<<1; // j sayısını 1 bit sola kaydır delay_ms(gecikme); //ledin yanık kalma süresigecikme veriliyor } // C portu için output_b(0);//son kalan portb bilgisi sıfırlanır j=1; for(i=0;i<8;i++) { output_c(j); j=j<<1; delay_ms(gecikme); } // D portu için output_c(0);//son kalan portc bilgisi sıfırlanır j=1; for(i=0;i<8;i++) { output_d(j); j=j<<1; delay_ms(gecikme); } //İLERİYE SAYIM SONU //GERİYE SAYIM D PORTU İLE BAŞLAR j=128; //kaydırma işlemi için sayı değeri for(i=0;i<7;i++) { j=j>>1; // j sayısını 1 bit sola kaydır output_d(j); //j sayısı çıkış portunda delay_ms(gecikme); //ledin yanık kalma süresi } output_d(0);//son kalan portd bilgisi sıfırlanır j=128; //kaydırma işlemi için sayı değeri for(i=0;i<7;color: #
Ahmet UZUN on 18 Mar 12" Precision Power Supply © 1986 Doug Bedrosian and 2010 Tony van Roon "This Precision Power Supply is a nice addition on your workbench as primary, or in my case, a supplementary power supply. With zero to 40V and 2A with adjustable current limiting it will surely gets lots of use on your bench. On average the most amperage for a power supply someone needs is around two or three amps. The sensitivity for current limiting is fully adjustable. Have fun building!" Introduction: Test instruments are considered to be some of the most useful tools available when constructing a project. They are also considered to be the most expensive tools one could buy. For instance, a power supply of any quality and usefulness can range from several hundred dollars to several thousand dollars. The alternative to buying a power supply is to build one. The power supply in this article has a voltage range from 0 to 40V and a current range from 0 to 2 amps with current limiting set by the user. The quality of the supply is determined by the time and care the builder takes while constructing it. How It Works: The power supply is best understood when divided into separate parts. The first parts to look at are the two power supply sections. The output supply section consists of XFMR1, Br1, C1, and C2. They supply the appropriate voltage and current required at the output. The IC supply consists of XFMR2, Br2, and C3. The two power supply sections must be separate from each other because a floating ground is required for IC1. The next section is the voltage control. RV1 and R2 determine the operating point of a constant current source out of pin 3 of IC1. By varying RV1 the maximum output voltage will be set. Pins 8 and 9 are inputs to a high gain differential amplifier contained in IC1. By adjusting potentiometer P1 the voltage at pin 8 will vary; this will cause the voltage at the output to change until it is equal to the voltage at pin 8. Due to the high gain of the differenti