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Maximum/minimum ampere input in a circuit, help needed. Answered

To start of my question im going to say i don't know a lot of electronics and that I am norwegian( so please excuse typos in english) :)

I have not done many major projects inside the field of electronics other than making a lightbulb light up. using a battery and to wires..
But I am very interseted in electonics ad think it is very exiting to read about. 

As my first "real" project i decided to make a "lie detector", altough it is mostly just a circuit that measures the resistance in your skin and makes a beeping sound after how much resistance your skin has( Dry skin = low resistance vs wet/sweaty skin = much resistance).

AND I DID IT! i made it work, and i was so proud! Then I realized that it was actually kinda lame and the beebing noise was wery annoying. So I decided to make a display that displayed a value after how much resistance your skin held. I managed to make a seven segment display from scratch. But now I am stuck...

You see the circuit gives an output of amps so it will output more amps on wet skin than on dry skin. But I have to "program"  the circuit to make the numbers on my display change. I want preferably to be able to do this without any IC's.

So my question is there possible to make a circuit that will allow current to pass through one circuit, but if the current is high enough it will take another way?

I tried to use diffrent resistors, but I didnt take into count that electricity only takes the road of least resistance no matter..

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gmoon

4 years ago

It's not clear from the description what you are attempting to build...

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VetleH

4 years ago

I also hope this was the right topic to put this question under, this is my first post...