Question

我正在开发一个带按钮的Arduino项目。按下按钮后，我需要执行一些操作。问题是每当我在A6和A7引脚上使用按钮时，我会得到意想不到的结果，就像按钮接收到HIGH而不被物理按压。只要我使用带按钮的数字引脚，代码就可以正常工作。

请您解释一下使用A6和A7引脚可能出现的问题，或者我需要考虑使用这些引脚有些棘手的问题。

非常感谢！

这是我的代码：

int buttonBack = A6;              
int flagLeft, flagRight;
int eventBack;

int currentButtonStatus = 0;
unsigned long currentButtonStatusStart1;  
unsigned long currentButtonStatusStart2;   
unsigned long currentButtonStatusStart3; 

const int delayFalse = 30;                
const int delayLongSingleClick = 300;    
const int delayDeltaDoubleClick = 200; 

void setup() {
  pinMode(buttonBack,INPUT);
}

void loop() {
  int eventBack = changeButtonStatus();
  if (eventBack > 0) {
    if(eventBack == 1) { // single button press
    flagLeft = 1; flagRight = 0;
    // move motor to the left code goes here
    }
    if(eventBack == 4) {
      // long button press
      flagLeft = 0;  flagRight = 1;
      // move motor to the right code goes here
    }
  }
}

int changeButtonStatus() {
  int event = 0; 
  int currentButtonClick = analogRead(buttonBack);
  unsigned long timeButton = millis();
  switch(currentButtonStatus) {
    case 0:
      if(currentButtonClick) {
        currentButtonStatus = 1;
        currentButtonStatusStart1 = millis();
      } else {
      }
      break;
    case 1:
      if(currentButtonClick) {
        if(timeButton - currentButtonStatusStart1 >= delayLongSingleClick) {
          event = 3;
        }
      } else {
        if(timeButton - currentButtonStatusStart1 < delayFalse) {
          currentButtonStatus = 0;
          event = 0;
        } else if(timeButton - currentButtonStatusStart1 < delayLongSingleClick) {
          currentButtonStatus = 2;
          currentButtonStatusStart2 = millis();
        } else {
          currentButtonStatus = 0;
          event = 4;
        }
      }
      break;
    case 2:
      if(currentButtonClick) {
        if(timeButton - currentButtonStatusStart2 < delayFalse) {
          currentButtonStatus = 1;
        } else {
          currentButtonStatus = 3;
          currentButtonStatusStart3 = millis();
        }
      } else {
        if(timeButton - currentButtonStatusStart2 > delayDeltaDoubleClick) {
          currentButtonStatus = 0;
          event = 1;
        }
      }
      break;
    case 3:
      if(currentButtonClick) {
      } else {
        if(timeButton - currentButtonStatusStart3 < delayFalse) {
        } else {
          event = 2;
          currentButtonStatus = 0;
        }
      }
      break;
  }
  return event;
}

Answer 1

A6和A7 具有GPIO功能。它们只能用作模拟输入，这意味着如果您尝试使用它们模拟数字输入，则需要提供外部上拉。

Arduino：使用按钮使用A6和A7的问题

1 个答案: