help using analog inputs as an ohm meter

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1

I have the circuit built and the arduino correctly reads two separate voltages at the same time accurately but when I try to split one voltage across a known resistor and an unknown resistor to find the value of the unknown the meter tells me that even though I am inputting only 3 volts there are 3 volts going into pin 0 and 1.8 volts going into pin 1. I know I am not creating 1.8 volts out of nothing. why is this happening?
any help would be great.

2

Schematic? Code? Please use code tags, and make your schematic images less than 1000 pixels wide.

3

ok. Here is my code. so far it measures the voltage coming into the 0 and 1 analog pins and displays the value onto the lcd
the picture is at https://drive.google.com/file/d/0B0KwO5OEf0tWai1rVG9HUWtSbFE/edit?usp=sharing
which is my google drive.

//going to be an ohm meter but for now it is just two voltmeters
// include the library code:
#include <SoftwareSerial.h>

SoftwareSerial mySerial(3,2);

// variables for input pin and control LED
  int analogInput = 1;
  int analogInput1=0;
  float vout = 0.0;
  float vout1 = 0.0;
  float vin1 = 0.0;
  float vin = 0.0;
  float R1 = 50000.0;    // !! resistance of R1 !!
  float R2 = 4400.0;     // !! resistance of R2 !!

// variable to store the value 
  int value = 0;
  int value1 = 0;

void setup(){
  // declaration of pin modes
  pinMode(analogInput, INPUT);
  pinMode(analogInput1, INPUT);

  // set up the LCD
  mySerial.begin(9600);
  delay(500);// wait for it to boot
}

void loop(){
  // read the value on analog input
  value = analogRead(1);
  value1 = analogRead(0);
  
  vout1 = (value1 * 5.0) / 1024.0;
  vout = (value * 5.0) / 1024.0;
  vin1 = vout1 / (R2/(R1+R2));
  vin = vout / (R2/(R1+R2));  

  // print result to lcd display
  mySerial.write(254);
  mySerial.write(128);
  mySerial.print(vin);
  mySerial.print("V");
  mySerial.print("           ");
  mySerial.print(vin1);
  mySerial.print("V");

  // sleep...
  delay(500);
}
4

Schematic? Much more helpful than a pictorial.