Question

我正在使用arduino uno，逻辑电平转换器，adafruit Bicolor LED矩阵，Raspberry pi和按钮，但我遇到了一些问题。我的目标是当按下按钮时，它会向arduino Uno发送一个信号，这将改变LED背包上的动画。问题是当循环重新启动时必须按下按钮，如果你在任何其他时间点击它都不会工作，我认为这是因为我使用delay（）暂停一切。有没有办法暂停而不使用延迟（）？我听说过使用Millis（），但我是Arduino的新手，我不确定如何实现它。提前谢谢。

#include <Adafruit_LEDBackpack.h>
#include <Adafruit_GFX.h>
#include <Wire.h>
#include "blinky.h"       // Animation for blinking and just chilling
#include "looking.h"    // This one looks forward when it hears or speaks

Adafruit_BicolorMatrix matrix = Adafruit_BicolorMatrix();  // We are using a bicolor Matrix

int piPin = 3;
char count = 0;

void setup() {
  matrix.begin(0x70);  // Turns on Matrix
  Serial.begin(9600);
  pinMode(piPin, INPUT);  // Tells the pin that it's an input
}

void loop() {
  int sense = digitalRead(piPin); //Reads the Pi pin

  while(sense == HIGH){ count + 1;}

  if(count >= 1) { //If the Raspberry Pi is sending input

    matrix.clear();
    matrix.drawBitmap(0, 0, looking_1, 8, 8, LED_YELLOW); // It will look forward
    matrix.writeDisplay();
    delay(3000);

    matrix.clear();
    matrix.drawBitmap(0, 0, looking_2, 8, 8, LED_YELLOW); // It will look forward
    matrix.writeDisplay();
    delay(200);

    matrix.clear();
    matrix.drawBitmap(0, 0, looking_3, 8, 8, LED_YELLOW); // It will look forward
    matrix.writeDisplay();
    delay(3000);

    matrix.clear();
    matrix.drawBitmap(0, 0, looking_2, 8, 8, LED_YELLOW);  //Makes it look back
    matrix.writeDisplay();
    delay(2000);

    count == 0;

  } else { 
    matrix.clear();
    matrix.drawBitmap(0, 0, blink_1, 8, 8, LED_GREEN); // It will just blink
    matrix.writeDisplay();
    delay(3000);

    matrix.clear();
    matrix.drawBitmap(0, 0, blink_2, 8, 8, LED_GREEN); // It will just blink
    matrix.writeDisplay();
    delay(100);

    matrix.clear();
    matrix.drawBitmap(0, 0, blink_3, 8, 8, LED_GREEN); // It will just blink
    matrix.writeDisplay();
    delay(100);

    matrix.clear();
    matrix.drawBitmap(0, 0, blink_4, 8, 8, LED_GREEN); // It will just blink
    matrix.writeDisplay();
    delay(100);

    matrix.clear();
    matrix.drawBitmap(0, 0, blink_5, 8, 8, LED_GREEN); // It will just blink
    matrix.writeDisplay();
    delay(100);

    matrix.clear();
    matrix.drawBitmap(0, 0, blink_6, 8, 8, LED_GREEN); // It will just blink
    matrix.writeDisplay();
    delay(100);

    matrix.clear();
    matrix.drawBitmap(0, 0, blink_7, 8, 8, LED_GREEN); // It will just blink
    matrix.writeDisplay();
    delay(100);

    matrix.clear();
    matrix.drawBitmap(0, 0, blink_8, 8, 8, LED_GREEN); // It will just blink
    matrix.writeDisplay();
    delay(100);

    matrix.clear();
    matrix.drawBitmap(0, 0, blink_9, 8, 8, LED_GREEN); // It will just blink
    matrix.writeDisplay();
    delay(100);

    matrix.clear();
    matrix.drawBitmap(0, 0, blink_8, 8, 8, LED_GREEN); // It will just blink
    matrix.writeDisplay();
    delay(100);

    matrix.clear();
    matrix.drawBitmap(0, 0, blink_7, 8, 8, LED_GREEN); // It will just blink
    matrix.writeDisplay();
    delay(100);

    matrix.clear();
    matrix.drawBitmap(0, 0, blink_6, 8, 8, LED_GREEN); // It will just blink
    matrix.writeDisplay();
    delay(100);

    matrix.clear();
    matrix.drawBitmap(0, 0, blink_5, 8, 8, LED_GREEN); // It will just blink
    matrix.writeDisplay();
    delay(100);

    matrix.clear();
    matrix.drawBitmap(0, 0, blink_4, 8, 8, LED_GREEN); // It will just blink
    matrix.writeDisplay();
    delay(100);

    matrix.clear();
    matrix.drawBitmap(0, 0, blink_3, 8, 8, LED_GREEN); // It will just blink
    matrix.writeDisplay();
    delay(100);

    matrix.clear();
    matrix.drawBitmap(0, 0, blink_2, 8, 8, LED_GREEN); // It will just blink
    matrix.writeDisplay();
    delay(100);

  }
}

Answer 1

您是对的，您可以将delay()替换为millis()。一种常见的方法是使用比较代码模式的时间，不会中断主循环。这允许Arduino以特定频率或时间执行命令。

以下示例举例说明了如何在不使用delay()的情况下每隔一秒（每四秒钟）执行一次函数。我认为这应该可以解决您的问题并启用伪并行执行：

// 2 sec. frequency
unsigned long interval=2000;    // the time we need to wait
unsigned long previousMillis=0; // millis() returns an unsigned long.

// 4 sec. frequency  
unsigned long interval1=4000;    // the time we need to wait
unsigned long previousMillis1=0; // millis() returns an unsigned long.

void setup() {
   //...
}

void loop() {

 // other CMD's...

 if ((unsigned long)(millis() - previousMillis) >= interval) {
    previousMillis = millis();
    // every second second
    // ... 
 }

 // other CMD's...

 if ((unsigned long)(millis() - previousMillis1) >= interval1) {
    previousMillis1 = millis();
    // every fourth second
    // ... 
 }

 // other CMD's...
}

此外，您已经可以在stackoverflow上找到一些类似问题，例如Arduino Multitasking。

暂停没有延迟（）arduino

1 个答案: