Please help with code for DS18B20

[fratello]

My opinion : MUST connect the LED trough resistor (R=U/I ; where U=5V and I depend on LED colour) ...

[astanapane]

it is strange because most of the times PICs can directly drive loads until 100mA. The leds get something like 10mA or less. The thing is that it looks like some pulses coming up from the pin. Can i test the PIN without any load on it with an oscilloscope? IF i have pulses then can we identify what the problem should be?

[Archangel]

it is strange because most of the times PICs can directly drive loads until 100mA. . . .

Ok I took this comment out of context . . . 100 ma if all port pins have a load on them distributed across the entire port . . . 25ma max on a single output pin. . . unless I misread the data sheets.

[astanapane]

Fratello,

i have changed your code a little bit, only a very simple thing in order to have two outputs.

instead of this

If V < TargetTemp - Hyst then ' Below Target temperature - Hysteresis
PORTA.2=1 ' Activate Warm Output
PORTA.3=0 ' Deactivate Cold Output
EndIf

If V > TargetTemp + Hyst then ' Above Target temperature + Hysteresis
PORTA.2=0 ' Deactivate Warm output
PORTA.3=1 ' Activate Cold Output
EndIf

i used this

If V < TargetTemp - Hyst then ' Below Target temperature - Hysteresis
PORTA.2=1 ' Activate Warm Output

EndIf

If V > TargetTemp + Hyst then ' Above Target temperature + Hysteresis
PORTA.2=0 ' Deactivate Warm output
EndIf

If V2 < TargetTemp - Hyst then ' Below Target temperature - Hysteresis
PORTA.3=0 ' Deactivate Cold Output
EndIf

If V2 > TargetTemp + Hyst then ' Above Target temperature + Hysteresis
PORTA.3=1 ' Activate Cold Output
EndIf

and now i have two outputs. Very simple change but useful.

Regards,

[Ioannis]

I used to manipulate the ports directly, but once I had a problem and suspicion have fallen on the technique among other things.

So, I now only use HIGH and LOW commands even if these eat a little program memory just to be sure.

If your code is small enough to fit in one page then you probably can use direct port control.

Ioannis