Temperature detection circuit [Require Checking and Reviews in Proteus]

[bluesam]

Dear all,

I built a circuit to detect temperature changes of range 10-40 degrees Celcius based on this schematic in the GIF file attachment below.

I made the schematic and run simulation based on Proteus Iris program, the file is attached below: rangebartan.dsn in a zip file

But it's been showing this problem:

1. According to GIF picture it should lights the LEDs from U4 to U6
but in my schematic and simulation it runs from U6 to U4

2. It should give a linear response to every celcius from the LM35DZ; one LED lights per celcius,
but in my simulation it has not

3. The U4 bargraph LED won't light up / turn on

Please help me with some review and suggestion and correction
Thanks God bless

bluesam

 

[ericgibbs]

hi,
The circuit gif, is drawn correctly and it should work from +100mV starting at U4 and in 10mV steps to 40C.
I suspect your simulation is at fault.

 

[bluesam]

thanks for the review eric
this attachment is my capture of my schematic on simulation (clip.jpg)
still confusing me

it might be helpful also if there a proteus user would like to give it a try
something i didn't set correctly on the proteus maybe?

bluesam

 

[bluesam]

hello i made that circuit into pcb circuit
but the problem is my lm 35 is heating up by itself
i wonder why
what's wrong?
did i miss something in pcb?

 

[bluesam]

status update:
the problem is solved by using the interactive potentiometer