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Recent content by vudiepdh1

  1. V

    Ni-Cd&NiMh elements charger.

    Sao lại có lọ cao sao vàng thế kia ! Hàng Việt hả ? :D
  2. V

    can not open wincc project

    Lasttime i still run my project in wincc. But now when i re-open that project. WinCC error Active project "A basic application could not be started. Please check your software license. I think my problem is Active WinCC. So I was re-actived winCC by using SIMATIC EKB Install 2009_08_26. But it...
  3. V

    SMPS 220V AC to 13.5 V DC

    Hi every one !! I want to design a circuit ( input 220V AC, output 13.5V Dc ) to charge for battery 12V Dc 100Ah using SMPS (boost mode ). I need some idea to do it . And i need some fomule to calculate SMPS transformer in this case ? Thanks !
  4. V

    About oscillator using crystal in 8051

    Hi all i have a question about oscillator in 8051. How does it work ? There are two ceramic capacitor 33p connected to Xtal1 and Xtal2 pins . What to do ? What happen if i don't use them ? Thankss!
  5. V

    Control 12v Dc motor speed using 8051.

    Thank for reply Ianp ! I have got some transistor H1061 . Can i use it in this case !?
  6. V

    Control 12v Dc motor speed using 8051.

    Thank a lots ! IANP
  7. V

    Control 12v Dc motor speed using 8051.

    Hi all ! I want to control 12v Dc motor speed using 8051. Many people say i should use Pwm to control motor speed . So please tell me how does it work and how to do it with 8051 . I am using c ! Thank
  8. V

    Problem with Converting voltage to frequency !

    Hi all . I have a problem with Lm331. I connect Fout pin in Lm331 to B pin 2n2222 transistor. And i really want to know transistor 2N2222 can work on off with frequency about 1kHz. Because i want to measure voltage Dc by counting frequency use Microcontroller 8051! Thank !
  9. V

    Need to charge battery NiCad 3.6v !

    I need a circuit to charge my battery NiCad 3.6v 600mah. And i want to know can i do it with LM317 and input voltage = 4.5 v Ac . Thanks a lot !
  10. V

    Help me to write simple C code for '51

    Help me c code ! I have a small problem with c code in programing 8051! I connect 2 button to p2.0 and p2.1 . Button 1 to increase value Parameter2 and button 2 to decrease value Parameter2 . I compare this Parameter2 with another Parameter1 = Th0*256 +TL0 ! If parameter 2 > parameter 1 then...
  11. V

    Help code asm - help urgently needed

    Help code asm i write this code for my project ! But it not run ! please correct it ! Help me !
  12. V

    Tachometer using 89s52 display lcd 16x2 !

    Hi every body ! i have a project with 8051 . I want to design a tachometer . Many people use pic or avr but with me , i'm a newbie so i start learning MC with 89s52 and use assembly for programing . Program button and lcd is so so ! But i have trouble with counter in 8051 . Please show me how to...
  13. V

    Programing assembly with 8051 LCD and button

    Thanks for all ! I will try !
  14. V

    Programing assembly with 8051 LCD and button

    here is my project ! But it is not run exactly ! Please help me if u can !
  15. V

    Programing assembly with 8051 LCD and button

    Hi every body ! I'm newbie in 8051 field .so i start learning it with assembly. I want to programing 8051 with button and lcd(8bit mode). If i press Mode button once lcd display "mode1" press twice lcd display "mode 2" and press Exit button to exit. Im trying program but it not run ! If u did...
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