Arduino UNO错误

Question

我在Arduino Projects Book中的代码中遇到了一个问题，这是一个非常简单的代码。

这是我写的代码：

const int greenLEDpin = 9;
const int redLEDpin = 10;
const int blueLEDpin = 11;

const int redSensorpin = A0;
const int greenSensorpin = A1;
const int blueSensorpin = A2;

int redValue = 0;
int greenValue = 0;
int blueValue = 0;

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

  pinMode(greenLEDpin,OUTPUT);
  pinMode(redLEDpin,OUTPUT);
  pinMode(blueLEDpin,OUTPUT);

}

void loop() {

  redSensorValue = analogRead(redSensorpin);
  delay (5);
  greenSensorValue = analogRead(greenSensorpin);
  delay(5);
  blueSensorValue = analogRead(blueSensorpin);

  Serial.print("Raw Sensor Values \t Red: ");
  Serial.print(redSensorValue);
  Serial.print("\t Green: ");
  Serial.print(greenSensorValue);
  Serial.print("\t Blue: ");
  Serial.println(blueSensorValue);

  redValue = redSensorValue/4;
  greenValue = greenSensorValue/4;
  blueValue = blueSensorValue/4;

  Serial.print("Mapped Sensor Values \t ReD: ");
  Serial.print(redValue);
  Serial.print("\t Green: ");
  Serial.print(greenValue);
  Serial.print("\t Blue: ");
  Serial.print(blueValue);
  analogWrite(redLEDpin, redValue);
  analogWrite(greenLEDpin, greenValue);
  analogWrite(blueLEDpin, blueValue);
}

下面是错误: Arduino:1.7.10 (Windows 8.1)，Placa:"Arduino Uno“

LED_tricolor.ino: In function 'void loop()':

LED_tricolor.ino:24:2: error: 'redSensorValue' was not declared in this scope

LED_tricolor.ino:26:2: error: 'greenSensorValue' was not declared in this scope

LED_tricolor.ino:28:2: error: 'blueSensorValue' was not declared in this scope

有人知道这里发生了什么吗？我之前试过一些方法，比如输入变量，但什么也没做。希望你们能帮助我^^。

Answer 1

尝试在安装之前添加以下内容：

int redSensorValue = 0; 
int greenSensorValue = 0; 
int blueSensorValue = 0; 

或者，如果您愿意，也可以在循环中的变量名之前添加int。

Answer 2

您没有在setup()函数中添加任何传感器引脚。就像这样编辑你的函数。

void setup() {

  pinMode(redSensorpin,INPUT);
  pinMode(greenSensorpin,INPUT);
  pinMode(blueSensorpin,INPUT);

  pinMode(greenLEDpin,OUTPUT);
  pinMode(redLEDpin,OUTPUT);
  pinMode(blueLEDpin,OUTPUT);
  Serial.begin(9600);

}