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Hi all, i would like to use PIC16F876a to build a simple digital clock.

Below is partial of the code :

for(i=0; i <= X; i++) {

delay_ms(1000)
c ...

Hi all, I'm trying to write some value in eeprom and read back, but it doesn;t work. Below is my code, is here anything wrong? thanks.

#include <16F876A.h>
#use delay(clock=20000000) ...

I there, i just wanna wats the max freq that can be configure using CCS for 877 to supply PWM using CCP pin?
The crystal freq is 20Mhz.
Can it supply 1Mhz-8Mhz PWM signals?

i just figured it out, for 12F675, only the last 2 hex numbers are used, others are ignore...
To off the comparator module, CMCON = 7;
#define NC_NC 0x0ff07

To use comparator with A1 as Vin-, A0 ...

Hi there, at the 12F675.h i found this

//////////////////////////////////////////////////////////////////
COMP
// Comparator Variables: C1OUT, C2OUT
// Constants used in setup_comparator( ...

oh ya, thanks PCM, i thought crystal and oscillator is the same.....

But actually whats the difference between that 2??
What's the effect using a crystal and a oscillator?

really?? i thought for PIC which has internal clock, need to define to use external clock (EC_IO), then need to define the clock speed (XT, HS)

Meaning if using external, just define XT or HS enu ...

just ignore me....found the problem

set_tris_b(0);

#include <16F767.h>
#use delay (clock=20000000)
#fuses HS,NOWDT,NOPUT,NOPROTECT,NOBROWNOUT,MCLR,NODEBUG,EC_IO
#byte portb=6

void main()

{

set_tris_b(1) ...

IMHO, i think u can switch to lm35 for temperature sensor, user frenly, only 3 pins, output analog voltage with is propotional to the temperature. Can try tat........

dun understand...sorry....

plz correct me if I'm wrong

The pid = Kp*E + Ki*sumE + Kd*dE/dt [1]

for the Ziegler-Nichols tuning method, it has open loop and closed loop, both has different calculations to find Kp, Ki and ...

browse thru it, nice document PCM, thanx

anyone else? need more infos......

no, din manage to get that although i googled for a few times....will look into it, thankx.

Hi there, currently I'm doing a temperature controller using 877. i know that Ziegler-Nichols can be use as a self-tuning method for PID.
But the problem is i dunno how to set the Ku and Pu.
I've ...