Schmitt Trigger Analog Input

[Flavioturk]

Hello, I am trying to develop a simple code (or at least I hope it to be simple) which triggers a led depending on the temperature (with hysteresis).

The temperature measurement is done by reading the analog voltage from a diode (its a simple project from school).I read the voltage of the diode (which is around 0'61 V) and i filter it. then i use the V = S*(T) + b formula from the Diode sensibility to get the temperature formula, so I put it on Labview.

 I then made an attempt to make this hysteresis with some comparators (i attach photos) but my proffesor said that was not it, so i had to try another thing. I have been searching a lot and i dont know what else to do, I have never used labview before and i have verry little knowledge of electronics. Please help

[ZYOng]

We can't run or debug images. Please attach your code instead.

Besides, what hardware are you using? Your code seems to be not reading or writing to any hardware.

[JB]

Let's use this names :

• SL : signal level
• HT : high threshold
• LT : low threshold
• CS : current state (True/False or High/Low, let's use T and F)

The hysteresis can be implemented like this :

• CS = T :
  • SL < LT : CS becomes L
  • SL >= LT : CS remains T
• CS = L :
  • SL > HT : CS becomes H
  • SL <= HT : CS remains L

You will need a While Loop, a Shift Register (CS) and a Case Structure. Let us know if you need further help.

[JB]

Here is an example showing the suggested method.
Sorry for the mix up between L/H and T/F in the description.