Loop with two variables requiring hysteris

[Vweber]

I need a script that turns on pump, P1 when atemperature sensor T1 is 10 degrees greator than temperature sensor T2 and keeps P1 running until temperature sensor T1 is less than 5 degrees greator than T2.

 

i have tried:

while (1)

 if ((T1[0] - T2[0] >= 10) && (T1[1] -T2[1] >= 10))

 P1 = 1

 endif

 if ((T1[0] - T2[0] <= 5 ) && (T1[1] -T2[1] <= 5))

 P1 = 0

 endif

endwhile

 

this just turns the pump on and off once per second or so while 10 degree threshold is met.

 

have tried a few other iterations, but it justdoes not seem to like the variable sum on readings taken every second.

 

any help is appreciated!

 

vic

[AzeoTech]

First, you forgot a delay() in the loop.  Always have some sort of delay.  But otherwise what you had should have worked.  Is P1 an output channel with a Timing of 0?  

[Vweber]

I did have a delay in the script I tried forgot to list it here.  Delay (1) after second endif.  P1 is digital output channel timing is 1 sec.

when I write a simpler script such as 

while (1)

 if T1 [0] > 80

 P1 = 1

endif

Delay (0)

endwhole

 

The pump turns on and remains on once T1 exceeds 80.  So channel appears to work.

 

[AzeoTech]

I think I'd need to see the whole document.  Can you post your .ctl?  Or email us it?

[Vweber]

Will do so when I get back to my system tomorrow.  Thanks so far for the help!