Please help with code for DS18B20

[fratello]

I made tens of this thermostat, for all my friends, relatives....without troubles. Maybe it's time to show us Your schematic !

[Acetronics2]

May we ALSO see your FULL code ???

...

Alain

[astanapane]

Yes sure, i will upload the code soon, and i will also make a small video if you want.

On the output, i have done the following configurations.

1) only an LED
2) light the LED through resistor.
3) light the LED through a transistor.

In case number 1. the 3MM LED does not go ON but it flashes very low with some pulses, it is not noticeable. (the 5 mm goes on)
In case number 2. the LED works just fine
In case number 3. the LED works just fine

My question is, if anyone understands why it does not light up straight from the PIC (pin) output with no transistor or resistor.

thanks a lot and sorry for the trouble

[Ioannis]

I can only assume an overload with some kind of interference with something else around...

I would never load directly PIC output pins.

Ioannis

[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.