Problem declaring variables

Projects Programming
1

I'm just doing my first sketches and have an issue where I get a "sensorPin was not declared in this scope" alarm for the "Love Meter"example in the projects book.

I thought I was declaring the variable in the setup with "const int sesnorPin = A0; "

Thanks in advance for your help!

void setup() {{
const int sesnorPin = A0;
const float baselineTemp = 20.0;}
Serial.begin(9600); //opens the serial port
for(int pinNumber = 2; pinNumber<5; pinNumber++){
pinMode(pinNumber, OUTPUT);
digitalWrite(pinNumber, LOW);
 }
}

void loop(){
int sensorVal = analogRead(sensorPin);
Serial.print("Sensor Value: ");
Serial.print(sensorVal);


float voltage = (sensorVal/1024.0) * 5.0;
Serial.print("Volts: ");
Serial.print(voltage);

float temperature = (voltage - 0.5) * 100;
Serial.print("degrees C: ");
Serial.print(temperature);

if (temperature < baselineTemp+2);{
digitalWrite(2, LOW);
digitalWrite(3, LOW);
digitalWrite(4, LOW);
}
else if (temperature >= baselineTemp+2 && temperature <baselineTemp+4);{
  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);
}
}

}void setup() {{
const int sesnorPin = A0;
const float baselineTemp = 20.0;}
Serial.begin(9600); //opens the serial port
for(int pinNumber = 2; pinNumber<5; pinNumber++){
pinMode(pinNumber, OUTPUT);
digitalWrite(pinNumber, LOW);
 }
}

void loop(){
int sensorVal = analogRead(sensorPin);
Serial.print("Sensor Value: ");
Serial.print(sensorVal);


float voltage = (sensorVal/1024.0) * 5.0;
Serial.print("Volts: ");
Serial.print(voltage);

float temperature = (voltage - 0.5) * 100;
Serial.print("degrees C: ");
Serial.print(temperature);

if (temperature < baselineTemp+2);{
digitalWrite(2, LOW);
digitalWrite(3, LOW);
digitalWrite(4, LOW);
}
else if (temperature >= baselineTemp+2 && temperature <baselineTemp+4);{
  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);
}
}

}
2

You are declaring sesnorPin (spelling ?) in setup() so it will only be available in setup()

Later, in loop() you try to use a variable named sensorPin which was never declared anywhere

Move the declaration to the start of the program to make the variable available globally and correct the spelling

3

Ah jeez rookie error... Thank you very much!