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THere is a bunch of microchips, like 16c73, 16f73, 16LC84, , 16CR83,16HV540, 16f877, 16f877a, 12f675, what does
Chip name
16 f 877 a
1 2 3 4

these parts in the name means
The ' ...

which chip u r using? New chips have internal pullups. Old ones have internal pullups on port 0 as I remember.

Yes mike, normally, we can compute PID like Kp, Ki, Kd, but in some case, they use Kp (1 + Ki' (...) + Kd' (...)). But in this case, it's so strange. And it must be something wrong.

I finished my P ...

I avoid using Hyperterminal. It always give me problems. Instead I use Terminal available free here:

http://bray.velenje.cx/avr/terminal

Thanks muchie, I see it easier to use.

1) Hook up th ...

I found the problem. We cannot do it with local variables, as I put it out as global variables, the program worked very good.

Thanks for all.

Nope, I had a basic program to xmit from PC to PIC, but I would like to ask how to xmit with Hyperterminal?

No, I dont talk about writing in PIC. I would like to know where can we fill in a byte, and give the send command to PIC in Hyperterminal. How we do that in HYperterminal??

I only see that when I c ...

Oh, I tested with the program, and this is my code:

float velocity_temp=0;
float delta=0;
signed long delta1=0;
float delta2=0;

if (velo_motion < 0)
{
...

how to send a byte form hyperterminal to pic? I only can read from it. Smile

it's perfect.

with pos_motion = 10000, velo_motion = 50; I got this

delta = 2.875000delta = 2.875000delta = 2.875000delta = 2.875000delta = 2.875000
delta = 2.875000delta = 2.875000delta = 2.875000delta = 2.875 ...

I have to compute in signed format number because it's the motion control, and it may take negative values.

as using asm, to express a negative number, I take out a bit of direction, and compute wi ...

Thanks rnielsen, I'll try.

by the way,

what will happen if I force the format number as:

beta = (signed long) delta;???

will it save the high bytes of result as normal, or what will it do?

Another thing to note is that 4mhz won't support 9600baud

Duane

Oh, I can communicate with PC using 16f876 and 16f877 at 4Mhz osc at 9600 baud. it's oki.

Oh, I write all read function in mode (0).

byte1 = i2c_read(0);
byte2=i2c_read(0);
...

well, it's wrong??

I'll test and tell you the results tomorrow. Thanks muchie valemike

I would like to compute this formular in 16F876:

delta = (pos_motion*acceleration/velo_motion)*(pos_motion*acceleration/velo_motion) - 4*pos_motion*acceleration;

pos_motion, velo ...