4x3 keypad and an LCD.. need help.
hello everyone! I'm new in this forum. Anyone can help me with my project? Im using a PIC16F877 and i want to know what codes are needed in PICBasic Pro to display the number key pressed in the 16x2 LCD Hitachi HD44780 and the total number that was entered will be stored in a variable for later use in the program.. pls help me.. thnx to all who can help..
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Welcome to the forum.
First let me ask how far you are in this adventure.
Have you got an LCD to work yet? If so then these will help with the key-pad.
http://www.picbasic.co.uk/forum/showthread.php?t=3250
http://www.picbasic.co.uk/forum/showthread.php?t=10110
Dave
Always wear safety glasses while programming.
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To repeat Mackrackit's admonition: Welcome to the forum. Now, look at the home page, scroll down to code examples, open it up and you will find at least 2 usable examples there.
Last edited by Archangel; - 23rd December 2008 at 17:25.
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Welcome here,Taisen
Also think to browse the PARALLAX site ... ( ~ same basic )
your app reminds me something seen there ...
Alain
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Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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IF there is the word "Problem" in your question ...
certainly the answer is " RTFM " or " RTFDataSheet " !!!
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thank you sir mack, joe and ace.. i'll try to study what you have told me. can i ask 1 more thing? u know how to translate this equation into picbasic pro codes: x = 2 * 1.5.. i tried to do this but the result was x = 2 only.. it means only the equation x = 2 * 1 was seen by the program.. anyone can help.. thnx!
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If you must have floating points there is a routine over at the MeLabs site.
The easy way for what you are doing is to drop the decimal point.
x = 2 * 1.5
would be
x = 2 * 15 / 10
Then if you are wanting to display a 3.0
65535 is the largest value for a WORD size variable. So 125000 over flows, comes back around starting at zero and the result is 59464.Code:LCDOUT, $FE;1,DEC x,".",DEC2 x//100
Dave
Always wear safety glasses while programming.
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i tried the codes but the lcd displaying 3.03.
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OOPPS, I was not thinking straight
What we are doing.
Take the number with one decimal place and multiply by 10 before the PIC sees it.
1.5 is now 15
1.6 is now 16
...
In the above the "x / 10" will return 3.Code:x = 2 * 16 lcdout $FE,1,DEC x / 10,".",DEC x//10
x//10 will return the remainder 2.
Look in the Pic Basic manual under Math Operators for more fun/confusing stuff
Dave
Always wear safety glasses while programming.
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thanks! that info really helps me..
But i still got another problem. if the equation goes like this x = 26 // 21.. the answer should be 238095238, the decimal part cannot read by the program and the answer is wrong because the limit is 65535 right? how to get the right answer like display 238 only? thanks again..
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also when the equation is x = 50 x 2500.. x becomes 59464 instead of 125000.. anyone know why this happen?
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