"exit status 1 'microsecondsToInches' was not declared in this scope"

Question

我正在尝试为一个小项目编程一个超声波传感器，我正在尝试设计一个液位传感器。这是我现在正在学习的一门初级机电一体化课程。但它一直在第42行给我这个错误，在空循环下面，上面写着：

"；退出状态1'microsoftecondsToInches'未在此范围内声明">

#include <LiquidCrystal.h>
const int rs = 13, en = 12, d4 = 11, d5 = 10, d6 = 9, d7 = 8;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
int LED1 = 7;
int LED2 = 6;
int LED3 = 5;
int LED4 = 4;
int Bocina = 3;
const int echoPin = 2;
const int trigPin = 1;
void setup() {
pinMode (LED1, OUTPUT);
digitalWrite(LED1, LOW);
pinMode(LED2, OUTPUT);
digitalWrite(LED2, LOW);
pinMode(LED3, OUTPUT);
digitalWrite(LED3, LOW);
pinMode(LED4, OUTPUT);
digitalWrite(LED4, LOW);
pinMode(Bocina, OUTPUT);
lcd.begin(16, 2);
}
void loop() {
long duration;
long inches;
long cm;
lcd.clear();
pinMode(trigPin, OUTPUT);
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
pinMode(echoPin, INPUT);
duration = pulseIn(echoPin, HIGH);
//cm = ( duration / 29 ) / 2;
//inches = cm * 0.393701;
inches = microsecondsToInches(duration);
cm = microsecondsToCentimeters(duration);
lcd.setCursor(5, 0);
lcd.print("Nivel:");
lcd.setCursor(0, 1);
lcd.print(inches);
lcd.print(" in");
}
if (inches >= 4) {
digitalWrite (LED1, HIGH);
digitalWrite (LED2, HIGH);
digitalWrite (LED3, HIGH);
digitalWrite (LED4, LOW);
}
else if (inches >= 3) {
digitalWrite (LED1, LOW);
digitalWrite (LED2, HIGH);
digitalWrite (LED3, HIGH);
digitalWrite (LED4, LOW);
}
else if (inches >= 2) {
digitalWrite (LED1, LOW);
digitalWrite (LED2, LOW);
digitalWrite (LED3, HIGH);
digitalWrite (LED4, LOW);
tone(3, 2000, 100);
delay(1000);
}
else if (inches >= 1) {
digitalWrite (LED1, LOW);
digitalWrite (LED2, LOW);
digitalWrite (LED3, LOW);
digitalWrite (LED4, HIGH);
tone(3, 2000);
}
}
long microsecondsToInches(long microseconds) {
return (microseconds / 74) / 2;
}
long microsecondsToCentimeters(long microseconds) {
return (microseconds / 29) / 2;
}

有人能解释一下这里出了什么问题吗？如何解决？

提前感谢：(

Answer 1

Arduino没有正确生成函数原型，因为文件中存在语法错误。

在声明microsecondsToInches函数之前，您有一个额外的右括号}。只要去掉它，你就可以去了

也欢迎堆栈溢出！