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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 first command is right,then send second command or third command MCU was stuck,as snapshot,who can...
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.
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 storage data(time,year,month,day) without power off.Thanks in advance!!
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.
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 idea for the issue? Thanks!!
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 way to control multichannal by 74HC595 and ULN2803.How to compiled it? THX!
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 code:0x00?
Send command 0x01fe,it's prefix=0x01,suffix=0xfe,P1=0xfe.How to add answer code:0x01?
send...
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.
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 char prefix=0x00;
unsigned char suffix=0x00;
void Delay(){
unsigned char i,j;
for(i=0;i<255;i++)...
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