Question

我刚开始编程我的Arduino，我试图能够手动设置时钟。我正在使用旋转传感器选择小时数，然后使用按钮确认小时数并交换以更改分钟数。但是，目前，当我更改小时数并选择适当的分钟值时，小时值将重置为00.

我使用的是Genuino Uno板，带有Grove旋转传感器，LCD显示屏和按钮，以及底座护罩。

我希望有人可以澄清我的错误，并建议为什么我的变量在编辑小时和分钟之间重置。

#include <rgb_lcd.h>

rgb_lcd lcd;

const int colorR = 255;
const int colorG = 20;
const int colorB = 147;

const int analogInPin = 0;  // Analog input pin that the rotary sensor is attached to

int sensorValue = 0;        // value read from the rotary sensor
int outputValue = 0;
int button = 2;
int hour = 00;
int minute = 00;
int button_state = 0;
int minute_temp = 0;
int hour_temp = 0;

void setup() {
  // set up the LCD's number of columns and rows:
  Serial.begin(9600);
  lcd.begin(16, 2);
  pinMode(button, INPUT);

  lcd.setRGB(colorR, colorG, colorB);
  Serial.println("HELLO");

}
void loop() {
  int confirm = 0;
  confirm = digitalRead(button);
  if (button_state == 0) {
    // read the analog in value:
    sensorValue = analogRead(analogInPin);
    // map it to the range of the analog out:
    outputValue = map(sensorValue, 0, 1023, 0, 23);
    // change the analog out value:
    lcd.clear();
    lcd.setCursor(0, 0);

    String hour = String(outputValue);
    if (outputValue < 10) {
      hour = ("0" + hour);
    }

    minute_temp = minute;
    String minute = String(minute_temp);
    if (minute_temp < 10) {
      minute = ("0" + minute);
    }

    lcd.print(hour);
    lcd.print(":");
    lcd.print(minute);

    // wait 10 milliseconds before the next loop
    // for the analog-to-digital converter to settle
    // after the last reading:
    delay(10);
    if (confirm == HIGH){
      button_state = 1;
      delay(1000);
    }
  }
  else if (button_state == 1){
    // read the analog in value:
    sensorValue = analogRead(analogInPin);
    // map it to the range of the analog out:
    outputValue = map(sensorValue, 0, 1023, 0, 59);
    // change the analog out value:
    lcd.clear();
    lcd.setCursor(0, 0);

    String minute = String(outputValue);
    if (outputValue < 10) {
      minute = ("0" + minute);
    }

    hour_temp = hour;
    String hour = String(hour_temp);
    if (hour_temp < 10) {
      hour = ("0" + hour);
    }

    lcd.print(hour);
    lcd.print(":");
    lcd.print(minute);

    // wait 10 milliseconds before the next loop
    // for the analog-to-digital converter to settle
    // after the last reading:
    delay(10);
    if (confirm == HIGH){
      button_state = 5;
    }
  }
}

非常感谢。

Answer 1

您似乎在名为hour的if语句中有两个不同的变量。你有一个名为hour的全局int，你也有一个名为hour的本地String。本地String将影响全局int。您永远不会将名为hour的全局int变量赋予除0以外的任何值。在同一范围内具有两个具有相同名称的变量是确定混淆的方法。给出这两个不同的名字，我想你会看到这个问题。

全局变量在'if'中编辑，并在'else if'中重置为initial

1 个答案: