LED 没有打开

Question

我有一个奇怪的问题:o 当我点击一个按钮时，我在两个 xbee 之间建立了连接，连接到引脚 13 的 LED 灯亮起，然后 xbee 协调器发送信息以打开连接到 xbee 路由器引脚 D3 的 LED。问题是当我有时点击按钮时，led 开关有时不亮。我不知道问题出在代码中还是只是连接问题

int led = 13;
const int bouton = 2;
boolean state;
boolean laststate; 
void setup() {
  // put your setup code here, to run once:
pinMode(led, OUTPUT);
Serial.begin(9600);
pinMode(bouton, INPUT);
  digitalWrite(led, LOW);


}
void loop() {
  // put your main code here, to run repeatedly:
 state = digitalRead(bouton);
  digitalWrite(led, state);
  if (state == HIGH) {
    Serial.println("on");
    setRemoteState(5);
    delay(5000);
  } else {
    Serial.println("off");
    setRemoteState(4);
    delay(5000);

  }
}  

void setRemoteState(char value){
  Serial.write(0x7E); // start byte
  Serial.write((byte)0x0);
  Serial.write(0x10);
  Serial.write(0x17);
  Serial.write((byte)0x0);
  // id of recipient or use 0xFFFF for broadcast
  Serial.write((byte)00);
  Serial.write((byte)00);
  Serial.write((byte)00);
  Serial.write((byte)00);
  Serial.write((byte)00);
  Serial.write((byte)00);
  Serial.write(0xFF);
  Serial.write(0xFF);
  // 16 bit of reciepent 
  Serial.write(0xFF);
  Serial.write(0xFE);  
  
   Serial.write(0x02); 
   
   Serial.write('D');
   Serial.write('2');
   
   Serial.write(value);
   
   long sum = 0x17 + 0xFF + 0xFF + 0xFF + 0xFE + 0x02 + 'D' + '2' + value;
   Serial.write(0xFF - ( sum & 0xFF) );
   Serial.println(sum,HEX);
}

Answer 1

看来问题出在延迟（5000）上微控制器将在按钮状态样本之间等待 5 秒。如果您删除延迟语句，它应该立即打开和关闭。

您应该尝试仅在状态更改时触发 setRemoteState，这样它就不会不断发送。像

loop() {
state = digitalRead(bouton);
  digitalWrite(led, state);
if(state != lastState)
{
  if (state == HIGH) {
    Serial.println("on");
    setRemoteState(5);
  } else {
    Serial.println("off");
    setRemoteState(4);

  }
}
  lastState = state
}

Answer 2

我想写这样的剧本！

String inputString;
int led = 13;
boolean state;
boolean laststate; 
void setup() {
  // put your setup code here, to run once:
pinMode(led, OUTPUT);
Serial.begin(9600);
Serial1.begin(9600);

}
void loop() {
while (Serial.available() ) {
    // get the new byte:
    delay(3);  
    char inChar = Serial.read();
    // add it to the inputString:
    inputString += inChar;
    }
  if (inputString.length() >0) {
    Serial.println(inputString);
if (inputString == "on"){
 digitalWrite(led,HIGH);
  setRemoteState(5);

}

if (inputString == "off"){
 digitalWrite(led,LOW);
setRemoteState(4);

}
inputString=""; 
}
}

void setRemoteState(char value){
  Serial1.write(0x7E); // start byte
  Serial1.write((byte)0x0);
  Serial1.write(0x10);
  Serial1.write(0x17);
  Serial1.write((byte)0x0);
  // id of recipient or use 0xFFFF for broadcast
  Serial1.write((byte)00);
  Serial1.write((byte)00);
  Serial1.write((byte)00);
  Serial1.write((byte)00);
  Serial1.write((byte)00);
  Serial1.write((byte)00);
  Serial1.write(0xFF);
  Serial1.write(0xFF);
  // 16 bit of reciepent 
  Serial1.write(0xFF);
  Serial1.write(0xFE);  
  
   Serial1.write(0x02); 
   
   Serial1.write('D');
   Serial1.write('2');
   
   Serial1.write(value);
   
   long sum = 0x17 + 0xFF + 0xFF + 0xFF + 0xFE + 0x02 + 'D' + '2' + value;
   Serial1.write(0xFF - ( sum & 0xFF) );
   Serial1.print(sum,HEX);
}

LED 没有打开

the led didn't switch on

arduino

led

xbee