Please help with code for DS18B20

[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.

[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.