error code ; before )

Using Arduino Programming Questions
1

const int sensorPin = A0;
const float baselineTemp=20.0;
void setup() {

Serial.begin(9600);

for (int pinNumber=2; pinNumber<5; pinNumber++;){
pinMode(2, OUTPUT);
digitalWrite(pinNumber, Low);
}
}

void loop() {
int sensorVal = analogRead(sensorPin);
Serial.print ("Sensor Value: ");
Serial.print(sensorVal);
float voltage = (sensorVal/1024)*5;
Serial.print (", Volts: ");
Serial.print(voltage);
Serial.print (", degress C: ");
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) ;

}

error code ; expected before ) line 49.

2

I see a problem but it is long before line 49.

This:

for (int pinNumber=2; pinNumber<5; pinNumber++;){

should not have the third (last) semicolon in it. It should look like this:

for (int pinNumber=2; pinNumber<5; pinNumber++){

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3

When you fix the problem pointed out by vaj4088, also change this:-digitalWrite(pinNumber, Low);to this:-digitalWrite(pinNumber, LOW);(C++ is case-sensitive)

Then your code should compile fine.

Edit: But it probably won't do what you want. Only pin 2 is made an output by this:-

 for (int pinNumber = 2; pinNumber < 5; pinNumber++)
    {
        pinMode(2, OUTPUT);
        digitalWrite(pinNumber, LOW);
    }

Perhaps you really meant:-

 for (int pinNumber = 2; pinNumber < 5; pinNumber++)
    {
        pinMode(pinNumber, OUTPUT);
        digitalWrite(pinNumber, LOW);
    }

Also, this won't produce a floating point result:-float voltage = (sensorVal/1024)*5;
But this will:-float voltage = (sensorVal/1024.0)*5.0;