使用PIR激活继电器模块电磁

问题描述：

于是我运行PIR关闭的Arduino，Arduino的GND脚的3.3V针，然后进入输入9.我调整我的代码的网站，但它仍然不起作用。当PIR低时，我想让继电器打开，然后用PIR关闭高电平。我还需要PIR在注册另一个输入之前等待至少5秒钟。使用PIR激活继电器模块电磁

#define RELAY_ON 1 
 
#define RELAY_OFF 0 
 

 
#define Relay_1 2 // Arduino Digital I/O pin number 
 
#define Relay_2 3 
 
#define Relay_3 4 
 
#define Relay_4 5 
 
#define Relay_5 6 
 
#define Relay_6 7 
 

 

 
/*-----(Declare Variables)-----*/ 
 
int waittime; // Delay between changes 
 

 
int state = LOW;    // by default, no motion detected 
 
int val = 0;     // variable to store the sensor status (value) 
 
int pirPin = 9; //the digital pin connected to the PIR sensor's output 
 

 

 

 
void setup() /****** SETUP: RUNS ONCE ******/ 
 
{ 
 
    waittime = 1000; 
 
    pinMode(pirPin, INPUT);  // initialize sensor as an input 
 
    Serial.begin(9600);  // initialize serial 
 
    
 
//-------(Initialize Pins so relays are active at reset)---- 
 
    digitalWrite(Relay_1, RELAY_ON); 
 
    digitalWrite(Relay_2, RELAY_ON); 
 
    digitalWrite(Relay_3, RELAY_ON); 
 
    digitalWrite(Relay_4, RELAY_ON); 
 
    digitalWrite(Relay_5, RELAY_ON); 
 
    digitalWrite(Relay_6, RELAY_ON); 
 
//---(THEN set pins as outputs)---- 
 

 
    digitalWrite(pirPin, LOW); 
 
    pinMode(Relay_1, OUTPUT); 
 
    pinMode(Relay_2, OUTPUT); 
 
    pinMode(Relay_3, OUTPUT); 
 
    pinMode(Relay_4, OUTPUT);  
 
    pinMode(Relay_5, OUTPUT); 
 
    pinMode(Relay_6, OUTPUT); 
 
    delay(4000); //Check that all relays are active at Reset 
 
    
 
}//--(end setup)--- 
 

 

 
void loop() /****** LOOP: RUNS CONSTANTLY ******/ 
 
{ 
 

 
val = digitalRead(pirPin); // read sensor value 
 
if (val == HIGH) {   // check if the sensor is HIGH 
 
//---(Turn all 8 relays ON in pairs)--- 
 

 
    digitalWrite(Relay_1, RELAY_OFF);// set the Relay OFF 
 
    digitalWrite(Relay_2, RELAY_OFF);// set the Relay OFF 
 
    delay(waittime);    // wait for a second 
 
    
 
    digitalWrite(Relay_3, RELAY_OFF);// set the Relay OFF 
 
    digitalWrite(Relay_4, RELAY_OFF);// set the Relay OFF 
 
    delay(waittime); 
 
    
 
    digitalWrite(Relay_5, RELAY_OFF);// set the Relay OFF 
 
    digitalWrite(Relay_6, RELAY_OFF);// set the Relay OFF 
 
    delay(5000);    // wait see all relays ON 
 
    
 
    if (state == LOW) { 
 
     Serial.println("Motion detected!"); 
 
     state = HIGH;  // update variable state to HIGH 
 
    } 
 
    } 
 

 
    else { 
 
    
 
//---(Turn all 8 relays OFF in pairs)--- 
 

 
    digitalWrite(Relay_1, RELAY_ON);// set the Relay ON 
 
    digitalWrite(Relay_2, RELAY_ON);// set the Relay ON 
 
    delay(waittime); 
 
    
 
    digitalWrite(Relay_3, RELAY_ON);// set the Relay ON 
 
    digitalWrite(Relay_4, RELAY_ON);// set the Relay ON 
 
    delay(waittime); 
 
    
 
    digitalWrite(Relay_5, RELAY_ON);// set the Relay ON 
 
    digitalWrite(Relay_6, RELAY_ON);// set the Relay ON 
 
    delay(10000);    // wait see all relays OFF 
 
    
 
    
 
     
 
     
 
if (state == HIGH){ 
 
     Serial.println("Motion stopped!"); 
 
     state = LOW;  // update variable state to LOW 
 
     } 
 
    } 
 
    }

答

当事情不工作，我希望他们，我总是看第一接线方式。写一些简单的测试代码，它只会打印PIR信号引脚的状态。当你期望它会变高吗？当你期望的时候它会变低吗？如果没有，你有接线问题。在你思考剩下的编程之前，先理清它。

至于接线......你没有在你的描述提上拉电阻 - 最PIR模块（至少我使用过的那些）要求其信号引脚上的上拉电阻当没有信号时拉高输出。也许你有一个，只是没有提到它，但如果没有的话那可能是因为您的问题 - 没有一个上拉电阻，你的输出是浮动的，你的设备将无法正常工作，你期望它的方式。也就是说，大多数的Arduino板（你不说你使用的是哪一个）对数字引脚内部上拉，但你必须这样做，使他们：

pinMode(pin, INPUT);  
digitalWrite(pin, HIGH);

你设置你的信号引脚LOW在您的设置（）函数，即关闭了内部上拉电阻。将其改为HIGH将其打开，然后可以避免添加外部电阻。

另外，你确定你的PIR模块上运行的3.3V？有些需要5V。检查其数据表以确保。

使用PIR激活继电器模块电磁

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