love-o-meter

can please explain me why sensor not reading anything...

code: [select]

const int sensorpin = a0;
const float baselinetemp = 20.0;

void setup() {
    serial.begin(9600);
    for(int pinnumber = 2; pinnumber<5; pinnumber++){
      pinmode(pinnumber,output);
      digitalwrite(pinnumber, low);
 
    }
  // put setup code here, run once:

}

void loop() {
  int sensorval = analogread(sensorpin);
  serial.print("sensor value: 158");
  serial.print(sensorval);
  // put main code here, run repeatedly:
  float voltage = (sensorval/1024.0) * 5.0;
  serial.print(", volts: .77");
  serial.print(voltage);
  serial.print(", degrees c: 27.15");
  // convert voltage temperature in degrees
  float temperature = (voltage - .5) * 100;
  serial.println(temperature);
  if(temperature < baselinetemp){
    digitalwrite(2, low);
    digitalwrite(3, low);
    digitalwrite(4, low);
  }else if(temperature >= baselinetemp+2 &&
    temperature < baselinetemp+4){
    digitalwrite(2, high);
    digitalwrite(3, low);
    digitalwrite(4, low);
   
  }else if(temperature >= baselinetemp+4 &&
    temperature < baselinetemp+6){
    digitalwrite(2, high);
    digitalwrite(3, high);
    digitalwrite(4, low);
   
  }else if(temperature >= baselinetemp+6){
    digitalwrite(2, high);
    digitalwrite(3, high);
    digitalwrite(4, high);

    }
    delay(1);
}
   
 

how installation issue?

don't think mentioning type of sensor important?  mean not reading anything, analogread gives value.  maybe doesn't read think should, giving sort of reading. 

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