Labview pointers needed folks

[scooobie_3e3]

Hi Folks I'm looking for some direction in getting my project rolling on. I've been stuck on a particular part of it for the past 5-6 days. I've searched quite a bit and I have seen anything that I can relate to my issue. Anyway my project is the exact same as this in one of the previous threads on the website

https://www.chiefdelphi.com/forums/s...hreadid=131549
"n automatic mode the system will monitor the ambient temp and depending on the value will switch the heater on or not. the heater is switched on when the temp falls below the low temp setpoint. When the heater is switched on the system will add a value to the measured temp to show the temp rising, when the temp reaches the high temp setpoint the heater switches off.

In manual mode the heater will be on whenever the heater on/off switch is on. The system will monitor the heater on/off condition at all times.

The front panel should include:

- Indicators
AC on/off
Heater on/off
Manual or Automatic operation
current temperature reading
Historical temperature reading (Chart)

- Controls
AC on/off
Heater on/off
Manual or Automatic
Temperature setpoint control low- to switch heater on
Temperature setpoint control high- to switch heater off
-Coding

Use a case structure to control manual and automatic operation.
Use a case structure in decision making e.g. when deciding to switch heater on or off."

I've gotten a screen capture of the project so far and I've built the front panel and all works well. The issue I have is that the source of the input is a subVI call demo temp read and it produces a random temperature reading. As its random I only want to send one reading so for that I've gotten it outside the loop structures. The issue is that because of this once the reading is sent out it gets lost in the loop after the first run. I've a case structure for the manual or automatic. I've not started on the automatic side as of yet so I just have a constant in there to run that particular case. In the manual side I've another case structure which is controlled by the status of the heater. I was going to use a divide numeric to simulate temp fall and a multiply numeric to simulate increase in temp. The AC on I've used a frame with a while loop with the AC on button stopping that loop and progressing to the next frame.

I'm not looking for some to do the work for me but I'm looking at this for so long now that I think i've walled myself in mentally. So I'm just looking for ideas. This is a project for college and I've still got about 2-3 weeks to but I'd like to stay ahead of the deadline. Any help would be great appreciated. As I'm new this post wont likely display for a specific time so I'm still researching. If Its sorted in the meantime I'll update the thread. Anyway thanks for taking the time to read this.

Scooobie

[Mark McLeod]

You are probably looking for a "shift register" or a "feedback node".