sht75 code locked up

[microkam]

thanx mister to try to solve my problem..
i run the board in my lap without heater load and it's run for three days and all things is ok , but the problem start when i connected the heater load , maybe the spark in contacter cause error in the command through sensor cabel sheild , that why the program locked up in the last code i attached .

[mister_e]

Possibles causes:
unsufficient ground plane on your PCB
unsufficient power supply filtering
usused input/output left floating
Ground loop/ground bouncing
unsufficient incoming data filtering/buffering ( can we say buffering ??? ;D )
...
...
...
Is your stuff share a power supply or it have it's own?

You can still additional hardware to Enable and Disable your Contactor on the Zero Crossing of the AC line. It could be done in software too. By using one or the other method, you'll have to adjust the timing to compensate the Contactor latency.

This should solve a part of your problem.

[microkam]

Possibles causes:
unsufficient ground plane on your PCB
unsufficient power supply filtering
usused input/output left floating
Ground loop/ground bouncing
.

the power supply is clean as can be , i put the filter ,the ground plane on my PCB i think is good.

unsufficient incoming data filtering/buffering ( can we say buffering ??? ;D )
.

how can i make filtering for the data incoming from sensor , or how can i solve this problem by code to reset the program if any locked up happend in the sht code.

[mister_e]

Maybe some opto-isolator could help. Is your unit provide the supply to your Sensor? If so, one more possible cause in the basket.

Cancel ambient noise by software... i would never try/trust something like that. Sure good enough for analog reading, but as your PIC seems to Stuck in real world and not on a bench... review your hardware first. Software can't really avoid ground bouncing, back EMF, ... If something like that could be done.. i certainely buy the stuff and change the Meteo with

You really should think about the zero crossing stuff i stated before. Better chance to reduce noise, AND increase the contactor contacts lifetime.

[microkam]

thanks mister very much for your trying to help me again.

You really should think about the zero crossing stuff i stated before. Better chance to reduce noise, AND increase the contactor contacts lifetime

the load is 3-ph heater, so how can i make zero crossing on 3-ph load !!!

this error (stuck in sht code) is happened one time every 2-3 days,so at this time i want code to detect any stuck will happen in this code.

i process some code like that

While dta=1
Wend

i put a maximum time to stay in this loop , over this time the program reset and read the sensor second time >

the problem here

ShiftIn dta,clk,0,[result.highbyte\8]

i cant put a maximum time for this command ..

any soluation can help me to pass this problem without changing in hardware.

[mister_e]

I don't see how it could be done if you just have 1 contactor to do the job... but with 3 .. no problem, fire them on each zero crossing should work.

I know there's some dedicated contactor for that. Google search i guess.

Melanie should have some pointer on that.

As i'm not in a familiar area... i can't be too much of help.

[microkam]

thank you mister very much again.

but realy i dont know if any body can help me in this point .