arduino 学习（5）

一些其他传感器

1. 声音传感器

暂时还没有读出值，还没有找到问题原因。

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  int sensorValue = analogRead(A0);

  Serial.println(sensorValue);

  delay(1000);
}

2. 触摸传感器
   

   void setup() {
     // put your setup code here, to run once:
     Serial.begin(9600);
   }
   
   void loop() {
     // put your main code here, to run repeatedly:
     int sensorValue = digitalRead(5);
   
     Serial.println(sensorValue);
   
     delay(100);
   }

触摸时为1，放开时为0；

3. 蜂鸣器模块
   

#include "pitches.h"

// notes in the melody:
int melody[] = {
  659, 659, 740, 659, 440, 830, 
  659, 659, 740, 659, 494, 440
};

// note durations: 4 = quarter note, 8 = eighth note, etc.:
float noteDurations[] = {
  2, 2, 1, 1, 1, 0.5,
  2, 2, 1, 1, 1, 0.5
};

void setup() {
  // iterate over the notes of the melody:
  Serial.begin(9600);
  for (int thisNote = 0; thisNote < 12; thisNote++) {

    // to calculate the note duration, take one second divided by the note type.
    //e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.
    int noteDuration = 1000 * 3 / 4 / noteDurations[thisNote];
    tone(8, melody[thisNote], noteDuration);

    // to distinguish the notes, set a minimum time between them.
    // the note's duration + 30% seems to work well:
    int pauseBetweenNotes = noteDuration;
    Serial.print(melody[thisNote]);
    Serial.print("  ");
    Serial.println(noteDuration);

    delay(pauseBetweenNotes);
    // stop the tone playing:
  }
  noTone(8);
}

void loop() {
  // no need to repeat the melody.
}

4. RGB LED 模块
   

   void setup() {
     // put your setup code here, to run once:
   
   }
   
   void loop() {
     // put your main code here, to run repeatedly:
     pinMode(3, OUTPUT);
     pinMode(5, OUTPUT);
     pinMode(6, OUTPUT);
     analogWrite(3, 155);
     analogWrite(5, 123);
     analogWrite(6, 0);
     delay(1000);
     analogWrite(3, 0);
     analogWrite(5, 255);
     analogWrite(6, 0);
     delay(1000);
     analogWrite(3, 0);
     analogWrite(5, 0);
     analogWrite(6, 255);
     delay(1000);
   }

5. MQ2烟雾传感器
   

   // the setup routine runs once when you press reset:
   void setup() {
     // initialize serial communication at 9600 bits per second:
     Serial.begin(9600);
   }
   
   // the loop routine runs over and over again forever:
   void loop() {
     // read the input on analog pin 0:
     int sensorValue = analogRead(A0);
     // print out the value you read:
     Serial.println(sensorValue);
     delay(1);        // delay in between reads for stability
   }

6. 直流电机
   
   这是一个触摸板操控直流电机小风扇的程序

这里将触摸板放到二号GPIO引脚，做外部中断输入，然后去改变风扇状态，在触摸板不抽风的情况下还挺好用的。

bool fan_state = false;

void setup() {
  pinMode(3, OUTPUT);
  attachInterrupt(0, warning, RISING);
  Serial.begin(9600);
}

void loop() {
  if (fan_state) {
    digitalWrite(3, HIGH);
  } else {
    digitalWrite(3, LOW);
  }
}

void warning() {
  fan_state = !fan_state;
  Serial.print("fan_state: ");
  Serial.println(fan_state);

}

遇到的问题，

1. tone函数和IRremote库定时器冲突。
   ANS：https://blog.csdn.net/GreatSimulation/article/details/108982522
   这里我才用了重新再写一个函数的方法，修改TIMER在我的UNO板子上无法生效。