Please help with code for DS18B20

[malc-c]

DT, could you elaborate on a PID loop.

OK - google was my friend

http://en.wikipedia.org/wiki/PID_controller

[malc-c]

Err.... yeah...

previous_error = 0
integral = 0
start:
error = setpoint - actual_position
integral = integral + (error*dt)
derivative = (error - previous_error)/dt
output = (Kp*error) + (Ki*integral) + (Kd*derivative)
previous_error = error
wait(dt)
goto start

LOL - £34 for a commercial thermostat looks more promising !

[Archangel]

Err.... yeah...



LOL - £34 for a commercial thermostat looks more promising !

What ? That's as clear as mud! I thought they taught you that in primary school.
34 pounds for a thermostat? Must be the VAT ! Damn Globalists, want to federalize the world !
http://www.prothermostats.com/produc...product=100934
$40 US 24.42 GBP

[astanapane]

hi all,

i would like to make the circuit for the thermostat. could you please upload the circuit schematic? thanks a lot for your help.

[astanapane]

Dear all,

sorry for asking you for the schematic, i did it from the code but i need your advice according to the second sensor please.

could you please help me out to finish the schematic?

thanks.

[astanapane]

i have been trying to simulate the circuit on the proteus and also trying to make it work on the test board.

On the simulation i have some result but on the test board i dont get anything on the lcd.

Unfortunately with the code from Elektor i get some results on the lcd on the test board. But very wrong result like 234 oC.

Could someone upload the hex file from Mr. Fratello's #35? Could anyone made it work?

[Heckler]

but i need your advice according to the second sensor please.
could you please help me out to finish the schematic?

The second sensor (and the third, forth, fifth, etc, etc.) simply goes in parallel with the first... see example below.



The PIC's job is to address each individual sensor to read its value. That is how the One-Wire bus works. Each sensor has an address and will only respond to it's address.

[Darrel Taylor]

OK - google was my friend

http://en.wikipedia.org/wiki/PID_controller

You've got better friends than that.
HenrikOlsson for instance ...

PID-filter routine (2nd try).
http://www.picbasic.co.uk/forum/showthread.php?t=5874

I've used it. It works great.
It's a little tricky to find the correct constants. But trial and error usually works.
Although there is a purposeful method to tune the loop.
<br>

[malc-c]

You've got better friends than that.
HenrikOlsson for instance ...

PID-filter routine (2nd try).
http://www.picbasic.co.uk/forum/showthread.php?t=5874

I've used it. It works great.
It's a little tricky to find the correct constants. But trial and error usually works.
Although there is a purposeful method to tune the loop.
<br>

Sorry Darrel.... it's been a long day......!