Problem with Flex sensors

Other Hardware Sensors
1

Hello. I'm doing a project using flex sensors and i came upon a problem. The sensor doesn't read accurate values. I i used the code available in Spark Fun and it was working pretty fine, but now it isn't. This is the code i'm using. I tried changing the reference values for both the straight resistance and bend resistance but it doesn't work.

const int FLEX_PIN = A0; // Pin connected to voltage divider output

// Measure the voltage at 5V and the actual resistance of your
// 47k resistor, and enter them below:
const float VCC = 4.98; // Measured voltage of Ardunio 5V line
const float R_DIV = 47500.0; // Measured resistance of 3.3k resistor

// Upload the code, then try to adjust these values to more
// accurately calculate bend degree.
const float STRAIGHT_RESISTANCE = 37300.0; // resistance when straight
const float BEND_RESISTANCE = 90000.0; // resistance at 90 deg

void setup() 
{
  Serial.begin(9600);
  pinMode(FLEX_PIN, INPUT);
}

void loop() 
{
  // Read the ADC, and calculate voltage and resistance from it
  int flexADC = analogRead(FLEX_PIN);
  float flexV = flexADC * VCC / 1023.0;
  float flexR = R_DIV * (VCC / flexV - 1.0);
  Serial.println("Resistance: " + String(flexR) + " ohms");

  // Use the calculated resistance to estimate the sensor's
  // bend angle:
  float angle = map(flexR, STRAIGHT_RESISTANCE, BEND_RESISTANCE,
                   0, 90.0);
  Serial.println("Bend: " + String(angle) + " degrees");
  Serial.println();

  delay(500);
}

This is what i get:

Resistance:  INF ohms
Bend: -93.00 degrees

Resistance:  INF ohms
Bend: -93.00 degrees

Resistance:  INF ohms
Bend: -93.00 degrees

Resistance:  INF ohms
Bend: -93.00 degrees

Resistance:  INF ohms
Bend: -93.00 degrees

Resistance:  INF ohms
Bend: -93.00 degrees

Resistance:  INF ohms
Bend: -93.00 degrees

Hope someone can help me asap, it's kinda reeaally urgent. Thanks in advance.

2

I i used the code available in Spark Fun and it was working pretty fine, but now it isn't.

What exactly did you change in the meantime?

The output you get actually means A0 is connected to GND. Check your wiring!