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Type: Posts; User: sherryliu

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  1. [SOLVED]Closed: Re: PIC16F877A controlled 74HC595 by serial command

    Hi all

    Thank for all comment,I have been fixed it,thanks!!
  2. [SOLVED]Closed: PIC16F877A controlled 74HC595 by serial command

    Hi all

    I have a project need controlled 74hc595 by serial port send command such as send"0xEA 0xFC 0x01 55"controlled Q0,and send"0xEA 0xFC 0x02 55"controlled Q1,
    but i have a problem when i send...
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    [SOLVED]Closed: Re: C51 alarm clock play music and time show

    Thanks for you replied,the project is right except that bug of play customized music and without show time.I wish to know in both play music and show time.You can decompressing files to check it.
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    [SOLVED]Closed: Re: C51 alarm clock play music and time show

    My purpose is when I set alarm time as local time play customized music and show time.The issue is play music without show time,How to fixed it.THX!

    138413
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    [SOLVED]Closed: C51 alarm clock play music and time show

    Hi all
    I have a project of alarm timer.when set alarm time as local time both play music and show local time.apply for real is only play music without local time show,How to fixed the bugs and...
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    924

    Closed: Re: C51 add adjust alarm clock

    137421

    The schematic of adjustable clock,Pls help added code of keyscan.THX!
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    924

    Closed: Re: C51 add adjust alarm clock

    All of files in my attached,Pls download it,include source code&Proteus file.
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    924

    Closed: Re: C51 add adjust alarm clock

    Thank for your replying,my develop board 7 segment clock show hardware depend 74hc138&74hc573,I want add alarm clock,I don't how to configuration by the exist hardware,Pls give me a idea.
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    924

    Closed: C51 add adjust alarm clock

    Hi all
    I have a develop board of C51,7 segment show clock,I want to add alarm clock code,who can help me wrap it,Thanks in advance!
  10. [51]Closed: Re: How to controled multichannal relay by 74HC595 and ULN2803

    Yes ,I want to acquired voltage for different test point of PCBA board,if have twenty or thirty test points so using 74HC595 and ULN2803 controled Relays for different test point.Do you have else...
  11. [51]Closed: Re: How to controled multichannal relay by 74HC595 and ULN2803

    Hi all

    Thanks for your replying, acutally I want to switch different channal acquired voltage and send to COM Port compared.in my mind by relay controled but without do it.I want change other...
  12. [51]Closed: How to controled multichannal relay by 74HC595 and ULN2803

    Hi all

    Please help me that how to controled multichannal relay by 74HC595 and ULN2803.I want to switch differet channal acquired voltage.Thanks!
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    [51]Closed: Re: How to send&receive string form PC to C51

    Thank for your reply.My purpose is simple send command to control relay anywhere in four port,such as P0,P1,P2,P3.

    Send command 0x00fe,it's prefix=0x00,suffix=0xfe; P0=0xfe.How to add answer...
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    [51]Closed: Re: How to send&receive string form PC to C51

    appreciated you reply.Could you help me take out what else required .

    - - - Updated - - -

    attached file for refer.
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    [51]Closed: How to send&receive string form PC to C51

    Hi all
    I have a project need control relay via COM Port send command control it.I have a confuse of the issue.Here is code:

    #include <reg51.h>


    unsigned char Buffer[5]={0};


    unsigned...
  16. [SOLVED]Closed: AD1674 with AT89C51 convert using 74HC74 and 74HC00

    Hi all

    Here is code of AD1674 with C51 convert.


    #include <reg51.h>
    #include <INTRINS.H>
    #include <STDIO.H>
  17. Closed: Re: calculated resistor relation and voltage

    Thank for you reply,I want to know each resistor relation where is serial or parallel.thanks!!
  18. Closed: calculated resistor relation and voltage

    Please show resistor relation formula and voltage,thanks!!!
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    [SOLVED]Closed: Re: 8051 blinking led code

    I have modified code ,can do it.thanks!!
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    [SOLVED]Closed: Re: 8051 blinking led code

    Hi jayanth
    I used interrupt 0 to control blinking led,i want click it show one style,and click it again show other style.
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    [SOLVED]Closed: 8051 blinking led code

    Hi guys,i want to modified code to show blink led difference,how to optimized the code.when i click one show one way and click again show other way.

    #include <reg51.h>
    #include<intrins.h>
    ...
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    [SOLVED]Closed: Re: DS18B20 convert confuse

    Hi jayanth,i know what you are said,because t is int,from -32768to 32767,tt is float that tt=0x0550*0.0625=85.0000,finally t=tt*10+0.5=85*10+0.5=850.5.how to convert from float to int? Thanks for...
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    [SOLVED]Closed: DS18B20 convert confuse

    #include<reg52.h>
    #include <intrins.h>
    #define uchar unsigned char
    #define uint unsigned int
    sbit DATA = P1^1;
    uchar code...
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    Closed: C51 DS18B20 read ROM CRC

    #include <reg51.h>
    #include "intrins.h"


    unsigned char code tab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90};

    sbit DQ=P3^3;
    unsigned char tempL=0;
    unsigned char...
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    Closed: C51 ds1302 week &temperature show

    Hi everyone
    Could you tell how to change week show?

    Here is problem list:
    1).why the week show than actual day +1.
    2).why the temperature can't show.
    3).add adjust time code&setting alarm...
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