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I have found through experience that to achieve any decent accuracy over a relatively wide temperature range that you need at least 5 terms in your polynomial. That's a hell of an equation to crunch ...

Try copying the ISR controlled flags variable into a local variable in your main(). The value of this local copy will not be changed if an interrupt happens. Check the value of the copy and do your ...

By "Talk", you could use
-parallel data bytes passed between ports
-asynchronous serial rs232-style bytes between I/O pins, either on 1 wire, 2 or even more
-SPI synchronous transfers
- ...

see your private messages.

I wouldn't mind seeing that private message myself. I'm in the same boat along with several others both at home and at the automotive company where I work. We are all u ...

Your PIC is at the end of a USB cable so you need to add decoupling caps such as 100nF to 1uF across the PIC power supply pins. Also, it might help to install 20 ohm resistors in the D+ line and the D ...

when using 16f876a, i have to use port B for LCD.
and PICs "RB0/INT" is connected to LCD- Enable pin.

can we connect the LCD/Enable to the VCC?

No. The Enable pin is required to be ...

Problem Solved!

Try delay_ms(100) before the LCD_init().

i tryed with 1000 ms just to be sure lol ... work like a charm YES ! Smile

PS:i don't understand why 99% in the ppl in this forum never h ...

How do I program the eeprom on a 18f258?? On the 16f series, it was
#pragma rom 0x2100 = {0,1,0,0 } etc

to write to it when flash programing,

How do I do this on the 18fxx2 ??

Thanks in adva ...

thanks, this probably will work. Now, does this load the eprom every time I boot the Pic? I hope not...

No, the programmer will program the eeprom when you first program your chip. After that, the ...

I was reading somewhere that the compiler will automatically disable interrupts while doing certain functions that are timing sensitive such as putc(). That said, when the program tries to transmit 4 ...

data lines are split between different ports...
like:
D4-D0 RA4-RA0(PortA)
D7-D5 RB3-RB1(PortB)

i tried to use union and #define

but still it not working

cheers,
tom

#define DATA ...

Why use a loop like that? Why not this...

output_D(data_byte);

Dude, you can put the default eeprom values into your C source using the #ROM directive. You do not have to use up your valuable program memory to run code upon powerup to test for and install defaul ...

Typical PIC ADC input impedence is such that your signal source should have an impedence less than 10 kohm. It can be higher (i.e. 47k) if you put a capacitor on the signal near the PIC (i.e. 1nF to ...

A standard LCD has a built-in minimum internal setup time after powerup before it will properly accept commands. I suggest putting a short delay in your program that runs before the first attempt to ...