Please help with code for DS18B20

[astanapane]

Ok after all i found out that it was the sensor problem.

According to the outputs on the ports for high and low indication, the problem exists.

Once i place a low current 10mA it does not light but flashing very low.

If i place an led more that 20mA then it fully light up.

I dont know if anyone has the same problem.

[fratello]

The function on thermostat it's made with R (4k7 - from PIC port), transistor (BC547), relay (from collector to plus).

[astanapane]

Thanks Fratello,

i havent test with any transistor, because normally it works with an indication of LED. The ports can handle 100mA. I thought that would work like that.

This week i will be in Vienna and then i will be in America for some Seminars. So i wont be able to test in my lab the code or a circuit.

I will get 3 uLED 3,2 touch from Sparkfun and i will try to make and complete the circuit for RFID that i have started in addition to codelock circuit.

[Ioannis]

Which display did you ordered? the 4D 3.2" touch screen?

Ioannis

[astanapane]

yes this one Ioanni.

http://www.sparkfun.com/products/10089

[astanapane]

i'm facing the same problem with the LED output pulses.

Is there anyone has the same problem? I cannot fix it.

Once the temp goes closer to the SET temp, the output seems to have pulses before it light the LED at its level.

It looks like the PIC sends pulses at the very close set temp and once it comes to the action, lights the LED.

To be more specific.

Lets say we SET the TEMP at 22 C. and .10 C. the plus and minus from 22 C.

If the display goes to 21.6 or 21.8 the indicator LED flashes very low with pulses.

If the TEMP goes to 22.20 then the LED lights.

Please let me know if anyone of you having the same problem. To program i use the PIC KIT 2.

thanks a lot.

I would like to say that i have test the circuit with Transistor also and Resistor 4,7K.

But at the point close to the set TEMP the led keeps flashing, and once is reaching the (emaple 22.20 C) it goes stable active.

[Ioannis]

The comparisson is done with the program code in post #88?

Ioannis