arduino 制作换挡风扇

实物图

实物图

代码

代码

volatile int item;

void setup(){
  item = 0;
  pinMode(7, INPUT);
  Serial.begin(9600);
}

void loop(){
  if (!digitalRead(7)) {
    item = item + 1;
    Serial.println(item);
    delay(1000);

  }
  if (item == 5) {
    item = 0;

  }
  if (item == 1) {
    analogWrite(5,40);

  } else if (item == 2) {
    analogWrite(5,60);
  } else if (item == 3) {
    analogWrite(5,90);
  } else if (item == 4) {
    analogWrite(5,120);
  } else {
    analogWrite(5,0);

  }

}