TMP36 probe reading 0 on analog

Question

I've designed this system which is supposed to turn on the LEDs when the temperature of a particular probe exceeds 32 degrees. From what I can tell, this should be functional but the analog sensor is always reading 0 when calling analogRead() on the pin.

Here is an image of my circuit:

and my code:

int length = 5;
float airTemp = 32;

void setup() 
{
  Serial.begin(9600);
}

void loop() 
{      
  // loads current temperature into array
  int reading;
  float voltage;
  float temp[length];
  for (int i = 0; i < length; i++) 
  {
    reading = analogRead(i);
    Serial.print(reading);
    voltage = reading * 5.0;
    voltage /= 1024;
    temp[i] = (voltage - 0.5) * 100;
  }

  // turns on/off fans based on current temperature
  for (int i = 0; i < length; i++) 
  {  
    pinMode(i, OUTPUT);
    if (temp[i] > airTemp) 
    {
      digitalWrite(i + 8, HIGH);
    } 
    else if(temp[i] <= airTemp) 
    {
      digitalWrite(i + 8, LOW);    
    }
  }  
  delay(1000);
}   

I learned how to read the temperature from here. It's probably a dumb mistake, but I just started working with Arduino yesterday and I couldn't find information anywhere so thanks in advance.

Answer 1

The image on the linked tutorial has the middle pin of the TMP036 going to the analog input, whereas you have it going to 5V, so that is not going to help one bit.

In other words, it is wired wrongly.

Answer 2

Make sure your breadboard isn't one of the ones with split power rails. If the coloured lines on the + and GND rails have a break in them you will need to bridge that break with wire.

Solid rail:

Split rail:

Answer 3

I figured it out. I had the temperature sensors wired wrong.

Old (Bad):

Good: