hi sir i need one help now iam doing project on 89c51 using C51 Evaluation Software i converted 0-5 analog volatge to 0-5 digital voltage . now i want convert digital data to pressure my output should be like this 0v 1.1E-1 3v 4.1E-4 0.1 1.2E-1 4v 5.1E-5 1v 2.1E-2 5v 6.1E-6 2v 3.1E-3 i want 500 values in between 0 to 5 volts how to calibrate the voltage interms of preesure what logic i want use to convert Voltage to pressure my C51 not taking floting oparations please help regards chandra sri
MAIN\FORUM.C(19): error C241: 'main': auto segment too large main\forum.c - 1 Error(s), 0 Warning(s).
thank you sir thank you for your valueble answers Hear in my project iam using 4 seven segment display for to display the pressure. up to now iam displaying the pressure on the serial window. pleace tell how to display the data on 7 segment display with out using printf statement. Because printf is taking lot of memory . regards chandu
"in my project iam using 4 seven segment display for to display the pressure." Do you mean a four-digit 7-segment display? If so, how do you plan to display, for example, "4.1E-4" on four 7-segment digits:
4. = 1st digit 1 = 2nd digit E = 3rd digit - = 4th digit 4 = Oops! no more digits!!
Textbook time, again! Andy, do not come to the US, we have laws against cruel and unusual punishment :) Erik
we have laws against cruel and unusual punishment Textbook time may be cruel, but it is certainly not unusual, and therefore perfectly fine. :)
"Textbook time ... is certainly not unusual" It seems to be becoming increasingly unusual amongst today's students... :-(
hi sir this is my code { unsigned int voltage; unsigned char *pressure_string[] ={"3.07E-12","1.22E-10","6.56E-10"); v=0x02; voltage=voltage*50; P1=string[voltage]; } For voltage=0x02 carresponding pressure is 6.56E-10 from table. that is P1=6.56E-10; sir my doubt is PORT 1 well takes only 1 byte (8bits) then how it takes 6.56E-10; and how to devide the pressure 6.56E-10 into "6",".=constant","5","6","E=constant", "-=constant","1","0" . sir here iam using seven numbers 7segment Led display for displaying the pressure. thank you sir Regards chandu
Hi sir how to divide the "string" into singal elements example: string={"3.56E-12") in to "3", "." ,"5","6","E","-","1","2". Thank you Regards chandu
Stop! Now!! You are struggling with absolutely basic concepts of both 'C' programming and, apparently, the hardware itself. You seriously need to set this project aside, go back to basics, and get a proper understanding in the 'C' Language Get yourself a good book, and study it: http://www.keil.com/books/8051books.asp http://www.8052.com/books.phtml "my doubt is PORT 1 well takes only 1 byte (8bits) ... i am using seven numbers 7segment LED display" Sure, all the 8051's ports are 8 bits (1 byte) wide. So how have you connected seven 7-Segment digits to your 8051? Obviously, the way you write stuff to the display will depend entirely on how it is connected to the 8051!!