Please help with code for DS18B20

[fratello]

Each sensor has an address and will only respond to it's address.

Yes. right !!! In my code I put the individual code of each sensor . For working with ANOTHER sensors, first you need to read the address of each sensor and then modify the code. You can find some examples on this forum...

[astanapane]

hello,

thanks for the answer. i use the DS18B20, so i dont need to do any modification.

The problem is that i cannot see anything on the display. It looks like something is really wrong inside the code.

I think that i make the mistake on the code or the circuit above.

1) does this schematic corresponds to the code? (i need to put one more sensor)
2) do i need to do anything inside the code

for example in the following lines do i need to chose one of these?

;DS18B20_9bit CON %00011111 ; 93.75ms, 0.5°C
;DS18B20_10bit CON %00111111 ; 187.5ms, 0.25°C
;DS18B20_11bit CON %01011111 ; 375ms, 0.125°C
;DS18B20_12bit CON %01111111 ; 750ms, 0.0625°C (default)
DS18B20_1_12bit CON %01111111 ; 750ms, 0.0625°C
;DS18B20_2_12bit CON %01111111 ; 750ms, 0.0625°C


But still i dont see anything on my lcd.

[astanapane]

To be more specific,

as i understand i need to find the unique ID from each sensor and then modify it on the code.

First i need to solve an other problem, what about i dont see anything on the display?

Shouldnt i see some 'no sensor' or like that at least?

[fratello]

Yes, it's right what you say in post #71 !
Put this in top of code :

@ DEVICE pic16F628A, intOSC_osc_noclkout, WDT_OFF, PWRT_OFF, BOD_OFF, MCLR_ON
define osc 4

REMOVE Xtal and caps (no need quartz precision) ; or keep it - but then replace "Intosc_osc_noclkout" with "XT_Osc".
Now you MUST have something on display !

[astanapane]

i've tried it but nothing on the lcd again,

i think it has to do with the osc commands and there is the problem.

i put a 4mhz ceramic with two legs, i idid also tried the ceramic 4mhz with 3 legs. Nothing on the screen.

i'm sad that cannot complete it.

thanks a lot for your help! am i doing something wrong with the schematic? Do i need anything else?

The code from the elektor works, but i dont have the ds1820. And it is on the screen xxx.xx

But i dont understand why it does not work with your code.

[cncmachineguy]

First you need to prove the pic is running. There are no caps shown in above schematic at the xtal, do you have caps on it? Have you made a led blink? Did you try internal osc?

From the quick skim I did on this thread, it seems I have read several posts claiming the code works. Time to look at your hardware.

[astanapane]

ok i will try later this afternoon to blink an led.

Do i need capacitors for the ceramic 4 mhz resonator? I have also used a ceramic with 2 legs resonator at 4 mhz.

In any case i will try to blink an led.

As i mentioned on my previous posts, i have tried also the code from elektor, and works. (i just dont have the right sensor DS1820 which is very old and i dont get the right results. but i have something in the screen at least.

With the code from Mr. Fratello, i dont have anything on the screen. That mean that there is something wrong, either with the hardware or software.

Thank a lot again for your help.