Question

我正在使用arduino来计算车轮的速度。我使用霍尔效应传感器。每一秒我用它计算的新RPM更新我的速度值。如何在代码中的一秒条件之外发送数据而不影响我的计算

 // read RPM

 volatile int rpmcount = 0;//see http://arduino.cc/en/Reference/Volatile
 int rpm = 0;
 unsigned long lastmillis = 0;

 void setup(){
  Serial.begin(9600); 
  attachInterrupt(0, rpm_fan, FALLING);//interrupt cero (0) is on pin two(2).
 }

 void loop(){

  if (millis() - lastmillis == 1000){  /*Uptade every one second, this will be equal to reading           frecuency (Hz).*/

  detachInterrupt(0);    //Disable interrupt when calculating


  rpm = rpmcount * 60;  /* Convert frecuency to RPM, note: this works for one interruption per      full rotation. For two interrups per full rotation use rpmcount * 30.*/

  Serial.print("RPM =\t"); //print the word "RPM" and tab.
  Serial.print(rpm); // print the rpm value.
  Serial.print("\t Hz=\t"); //print the word "Hz".
  Serial.println(rpmcount); /*print revolutions per second or Hz. And print new line or enter.*/

  rpmcount = 0; // Restart the RPM counter
  lastmillis = millis(); // Uptade lasmillis
  attachInterrupt(0, rpm_fan, FALLING); //enable interrupt
   }
 }


 void rpm_fan(){ /* this code will be executed every time the interrupt 0 (pin2) gets low.*/
   rpmcount++;
 }

我需要每50毫秒更新一些其他值，怎么做？感谢

Answer 1

您可以使用TimeOne.h以50ms的速度添加ISR，其方式与attachInterrupt（）类似。还有用于Timer2的库。定时器功能通常用于生成PWM或硬件引脚功能。这些库将中断配置为溢出并将它们与相关引脚断开。

注意，Arduino核心库使用Timer0生成1ms中断，以更新millis（）计数器。除非在其他第二方库中使用，否则Timer1和2通常免费供一般使用。

Arduino串行中断外的通信

1 个答案: