sht75 code locked up

[microkam]

hi Melanie

The easiest (though not the cheapest) solution is to use a zero-cross SSR in two of the phases. All you do is treat the SSR input as if it was an LED. Switch it on, and it does the rest. You will find that Crydom, Carlo Gavazzi (and others) all do Zero-Cross and non-Zero-Cross versions of all their SSR's. Like I said, chose a Zero-Cross version.

i search for this SSR in my country and it's not avilable and it takes over one monthe if i order it..

so can you explain to me whats exactly the source of this noise!!
if i seperate control board and power contactor in different panel will reduce the noise >>>

[Melanie]

>so can you explain to me whats exactly the source of this noise!!

The meaning of Life, the Universe and Everything I can probably explain. The source of your noise however escapes me. I'm not in your environment, I can't see your design, and I have no test equipment available to track it down - this is something that you can do - because you are there, and I am here.

I worry about the code that you posted where you say the problem exists. Your While/Wend statements will hang the program until the correct state of the dta pin is recognised. You must track down WHICH of the several WHILE/WENDS is causing your program to hang and then determine WHY dta did not switch as expected. Is it because the PULSEOUT is out of specification and the chip did not acknoledge. Is it because noise on the line is causing the chip to acknowledge at the wrong time or send garbage. You'll have to dig deeper yourself.

It's unusual for the DS1307 to hang... I have tens of thousands in the field and it's never happened. Check your 5v supply is CLEAN. Make sure the Battery isn't next to a contactor switcing kVA - the usual things...

[mister_e]

In addition to Melanie, how about if you disconnect all pins of your SHT sensor and bypass it's own code?

any available schematic?

How far your SHT sensor is?

Is your board send the voltage to your sensor?

How? i mean, is there any buffer between your PCB and your sensor? case not, it's one other possibility of noise source.

As i already commented about the SHT obscure code but you said it's working on a single bech... i just want to know what's happen when you bypass this section.

Any PCB layout picture?

[microkam]

.......jjj

[microkam]

How far your SHT sensor is?
Is your board send the voltage to your sensor?
How? i mean, is there any buffer between your PCB and your sensor? case not, it's one other possibility of noise source.

sht cable sheild length 3m.
sht supplied +5v from my PCB without any buffer,and how can i put this buffer ,can you explain more.

Is it because noise on the line is causing the chip to acknowledge at the wrong time or send garbage

i tracked the problem and i found the problem from noise on the line , i tried to replace the sht cable with short one (0.5m) and the noise is cancled >.

SO . can i run timer on the first sht code and stop it on the end of code , if the timer reached to the maximum time then reset the pic .

Make sure the Battery isn't next to a contactor switcing kVA - the usual things...

should i connect battary to ds1307 , in my pcb i connect battary pin to ground . is this the problem .

[microkam]

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[microkam]

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[microkam]

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