我有一个 PIR 传感器连接到 Amica nodeMCU 板上,从 VIN 路由 5v,并通过 USB 端口连接以进行测试。当检测到运动时,它会连接到互联网并将数据发送到 IFTTT,我会在手机上收到通知。

当我通电时,PIR 暂停进行校准,然后立即变高并触发我在手机上收到的运动检测调用。然而,从那时起,它永远不会变低,但即使没有运动,也会每 5-8 分钟发送另一个高调用。

测试

  • 尝试对 PIR 使用单独的 5v 电源,同样的事情发生了
  • 我已经尝试了两种重新触发模式(H & L)并经历了相同的结果
  • Adafruit 羽翼 huzzah 板也是如此。
  • 我已经在没有微 Controller 的情况下测试了 PIR,可以确认它 功能正常 - 点亮 LED
  • 我已经用相同代码的 Arduino Nano 进行了测试,它 功能正常 - 点亮 LED

  • 我的代码 Arduino Playground PIR Project 的修改版本
    //Sends IFTTT every 5 minutes it detects motion
    
    #include <ESP8266WiFi.h>
    //WiFi Settings
    
    // Set up macros for wifi and connection.
    #define SSID "my-network"    // SSID
    #define PASS "mypassphrase"      // Network Password
    #define HOST "maker.ifttt.com"  // Webhost
    //-------------------------------
    const char* streamId   = "test";
    const char* privateKey = "mysecretkey";
    
    //PIR Settings
    //the time we give the sensor to calibrate (10-60 secs according to the datasheet)
    int calibrationTime = 10;
    
    //the time when the sensor outputs a low impulse
    long unsigned int lowIn;
    
    //the amount of milliseconds the sensor has to be low
    //before we assume all motion has stopped
    long unsigned int pause = 5000;
    
    
    int  interval = 1000; // Wait between dumps
    boolean lockLow = true;
    boolean takeLowTime;
    int ledPin = 1;
    int pirPin = 2;    //the digital pin connected to the PIR sensor's output
    int nPIR_detect;
    int motion = 2;
    
    int minSecsBetweenUpdates = 300; // 5 minutes
    long lastSend = -minSecsBetweenUpdates * 1000l;
    //-------------------------------
    
    // Begin Setup
    void setup(){
      Serial.begin(115200);
      pinMode(pirPin, INPUT);
      digitalWrite(pirPin, LOW);
    
      //give the sensor some time to calibrate
      Serial.print("calibrating sensor ");
      for(int i = 0; i < calibrationTime; i++){
        Serial.print(".");
        delay(1000);
        }
      Serial.println(" done");
      Serial.println("SENSOR ACTIVE");
      delay(50);
       nPIR_detect = 0;
    
      // Test ESP8266 module.
      Serial.println("AT");
      delay(5000);
      if(Serial.find("OK")){
        connectWiFi();
      }
    }
    
    void loop(){
     if(digitalRead(pirPin) == HIGH){
           digitalWrite(BUILTIN_LED, HIGH);   //the led visualizes the sensors output pin state
           if(lockLow){
             //makes sure we wait for a transition to LOW before any further output is made:
             lockLow = false;
             Serial.println("---");
             Serial.print("motion detected at ");
             Serial.print(millis()/1000);
             Serial.println(" sec");
             sendData(String(motion));
             delay(50);
             }
             takeLowTime = true;
           }
    
         if(digitalRead(pirPin) == LOW){
           digitalWrite(BUILTIN_LED, LOW);  //the led visualizes the sensors output pin state
    
           if(takeLowTime){
            lowIn = millis();          //save the time of the transition from high to LOW
            takeLowTime = false;       //make sure this is only done at the start of a LOW phase
            }
           //if the sensor is low for more than the given pause,
           //we assume that no more motion is going to happen
           if(!lockLow && millis() - lowIn > pause){
               //makes sure this block of code is only executed again after
               //a new motion sequence has been detected
               lockLow = true;
               Serial.print("motion ended at ");      //output
               Serial.print((millis() - pause)/1000);
               Serial.println(" sec");
               delay(50);
               }
           }
    }
    
    void sendData(String motion){
    
      //Send the motion to IFTTT value1
      Serial.print("connecting to ");
      Serial.println(HOST);
    
      // Use WiFiClient class to create TCP connections
      WiFiClient client;
      const int httpPort = 80;
      if (!client.connect(HOST, httpPort)) {
        Serial.println("connection failed");
        return;
      }
    
      // We now create a URI for the request
      String url = "/trigger/";
      url += streamId;
      url += "/with/key/";
      url += privateKey;
      url += "?value1=";
      url += "motion";
    
      Serial.print("Requesting URL: ");
      Serial.println(url);
    
      // This will send the request to the server
      client.print(String("GET ") + url + " HTTP/1.1\r\n" +
                   "Host: " + HOST + "\r\n" +
                   "Connection: close\r\n\r\n");
      delay(10);
    
      // Read all the lines of the reply from server and print them to Serial
      while(client.available()){
        String line = client.readStringUntil('\r');
        Serial.print(line);
      }
    
      Serial.println();
      Serial.println("closing connection");
    
    }
    
    boolean connectWiFi(){
      Serial.println("AT+CWMODE=1");
      delay(2000);
      String cmd="AT+CWJAP=\"";
      cmd+=SSID;
      cmd+="\",\"";
      cmd+=PASS;
      cmd+="\"";
      Serial.println(cmd);
      delay(5000);
      if(Serial.find("OK")){
        Serial.println("Connection");
        return true;
      }
      else{
        Serial.println("No Connection");
        return false;
      }
    }
    

    为什么使用 nodeMCU/ESP8266 板的 PIR 传感器会保持高电平?

    从本质上讲,我从未看到过“动议结束于……”的连续消息

    最佳答案

    几个月后,但希望能帮助其他人解决同样的问题。我沮丧了数周并尝试了几个具有相同(令人沮丧)结果的 PIR 模块,我发现问题是由我在 nodeMCU 开发板上刷新固件的方式引起的。

    我有 ESP-12E 并使用以下命令上传固件:

    esptool.py --port /dev/cu.SLAB_USBtoUART --baud 115200 write_flash -fm dio -fs 32m 0x00000 /Users/dev/nodemcu-firmware.bin
    

    问题是 -fm dio (双闪存 I/O 模式)参数。某些 ESP8266 模块,包括某些(并非全部)NodeMCU 板上的 ESP-12E 模块,是双 I/O,固件仅在使用 --flash_mode dio -fm dio 刷新时才会启动,但在我的情况下是我所有头痛的根源。一旦我在没有该选项的情况下刷新固件,一切都开始像魅力一样工作。

    关于arduino - 为什么使用 nodeMCU/ESP8266 板的 PIR 传感器保持高位?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/35903844/

    10-13 05:02