Clock and Dual Termometer

[cncmachineguy]

First thing I would try is take out the gosub readtemp. Just for testing purpose. Then report back, tell us exactly how it is not precision. is it losing 1 second per min. is it gaining 1? what is the output you are seeing?

BTW, I am looking at the second program

[fratello]

Thanks for atention ! All three programs are - without read_temperature - verry accurate !
I try, in all three cases, to put the "read_temp" code in other places... the results are inadequates !

[Acetronics2]

@ first you can try your program with a 9 bits resolution, to have the quickest sensor conversion time ...

THEN you will know where is something wrong ...

Alain

[malc-c]

Not checked the data sheet so can't confirm if this is an option, but for the sake of a couple of ££ why not use a DS1307 RTC chip ??

[cncmachineguy]

I try, in all three cases, to put the "read_temp" code in other places... the results are inadequates !

Still waiting to hear what the results are. Is it slow, fast, sometimes right, sometimes wrong? Is it close or all over the place?

[fratello]

The clock run ok without read_temp, in all cases and run faster ( strange for me ) if use this subroutine.
I try now with 9 bits resolution of DS18B20, wait for result !
Thanks for support !

[fratello]

If DS18B20 it's in 9 bit mode, the clock run faster (!) with ~ 2 sec/hour (5 sec in 3 hours).

[ardhuru]

Thats about .055%; you ARE using a crystal, not a resonator, right?

Anand

[fratello]

Yes, I use a crystal. But, without code for DS18B20, the clock run correct (~ 1 sec/day).