ABACOM - ELECTRONIC SOFTWARE

Hello ,everybody

On a project ,I used an analogical comparator ,with two analogic data .

When one A>B or A<B ,it working good

But my problem take place when A=B ,there no signal on the outpin A=B when the two input analogic signal are equal .

Why or where is my problem ?

Hello,

you should attach an example to the thread for comprehension what happened.


Many greetings,

tsd

Thanks for your reponse ,

I give you a picture part with 2v on A consign ,and you can see on the numeric meter ,2.0V ,and A=B don't appear.

Thanks much for who can help me for this problem

Hi Tourneur,

try to offset the output A1 to zero. The variable resistor from the K8055 should be turned to a zero value.

Many greetings,

tsd

It's working good !

I turn my Analog input from K8055 to a 0v value ,and enter in the analog comparator a 0 value .

But how to work with another equal value ,if i desire enter a consign more high as 0 , like 1 , 2 or more ?

Hi Tourneur,

you should clean (delete) the crosspoint between input A and B of the comparator.

The output fom your K8055 will be added to both inputs (A and B) - so, never you will get an equal.


Greetings from

TSD

I do it ,

So it's work ,but for pair consign number only ,like : 2 , 4 , 6, and 8 .
And not for the impair number like 1 , 3, 5, 7, and 9.

And it's the same thing for their multiple : ok for 20, 40, 60 and 80 no for 10, 30, 50 , 70, 90, and it's not working too for the no-decimal number ,like : 2.1 or 21 , 22 ,43 ,etc ...

Hello TOURNEUR

Your k8055 has a 8 Bit input with 5 Volt , there are ~ 0,019 Volt per Bit

Yuor Display has 0,1 Volt - so you can not see the right Display - and the compare doesn`t .

make your Display with 4 Digits right the decimal Point and you see the result.

Gerhard

Hello TOURNEUR

Here a little sample for the compare of 1 Digit right - that means compare
with 25.1 fixt between a input Display.


gerhard

Hi evrybody !

Thanks a lot ,for you interest ,so I had test a new shematic ,

It 's include an electronical selector ,betwen my K8055 interface witch giving me 26.31 analogue value

With your help request ,now I use a 5 digit display ,and to compare ,if it can be an error ,of my wiring ,I use a fixed value of 26.31.

I,the last to command the selector a simple switch select the fixed value ,or my k8055 value .

So the result the same : there no fonctionality with my external interface .

So now ,I see problem witch is in my configuration interface, or I don't know where .

But You can see my K8055 ,first analogue input configuration "AI1"

You can see ,I had get two min / max value ,with 3 unity after 0 to can get a best accurancy (in thinking ,my problem ,can be here )