Question

所以我在arduino的3.3v引脚，arduino的gnd引脚上运行PIR，然后进入输入9.我将代码调整到网站，但它仍然无法正常工作。我希望继电器在PIR为低电平时接通，然后在PIR为高电平时关闭。我还需要PIR在注册另一个输入之前等待至少5秒钟。

＆＃13;

#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
       }
     }
  }

＆＃13;

Answer 1

当事情没有按照我期望的方式发挥作用时，我总是先看看接线。写一些简单的测试代码，除了打印PIR信号引脚的状态外什么都不做。你期望它会变高吗？你期望它会降低吗？如果没有，您有接线问题。在你考虑其余的编程之前，先把它弄清楚。

至于接线......你没有在你的描述中提到一个上拉电阻 - 大多数PIR模块（至少是我曾经使用过的）都需要一个上拉电阻信号引脚在没有信号时将输出拉高。也许你有一个而且没有提到它，但如果没有那么那可能是你的问题 - 没有上拉电阻，你的输出是浮动的，你的设备将无法按照你期望的方式工作。也就是说，大多数Arduino电路板（你没有说明你使用的是哪个）都有数字引脚上的内部上拉电阻，但你必须通过以下方式启用它们：

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

您正在设置（）例程中将信号引脚设置为低电平，从而关闭内部上拉电阻。将其更改为HIGH以将其打开，然后您可以避免添加外部电阻。

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

使用PIR激活继电器模块上的电磁铁

1 个答案: