用于深度睡眠的 ESP32 触摸传感器

问题描述

我正在尝试唤醒我的 esp32 以通过 nRF Connect 中的蓝牙接收数据，但我没有温度、湿度和压力的值。我不知道为什么我什么也没看到，因为我的传感器（DHT22 和 BMP280）正确连接并且它们在串行监视器中传输良好的值，但在应用程序值字段中为空。我试图在回调函数中放入特性或在设置中，但同样的问题，空值。问题是什么？任何人都可以给我建议吗？ 我在下面附上我的代码。提前致谢！

#include <BLEDevice.h>
#include <BLEServer.h>
#include <bleutils.h>
//#include <BLE2902.h>
#include "DHT.h"
//#include <Wire.h>
#include <Adafruit_BMP280.h>
#include <Adafruit_Sensor.h>
#include <WiFi.h>
#include <HTTPClient.h>

  

BLEServer* pServer = NULL;
BLECharacteristic* temp_pCharacteristic = NULL;
BLECharacteristic* hum_pCharacteristic = NULL;
BLECharacteristic* pres_pCharacteristic = NULL;

bool deviceConnected = false;
bool oldDeviceConnected = false;

 #define DHTPIN 4            // Digital pin connected to the DHT sensor
 #define DHTTYPE DHT22       // DHT 22  (AM2302),AM2321
 DHT dht(DHTPIN,DHTTYPE);

 Adafruit_BMP280 bmp;         // Instantiate (create) a BMP280 object and set-up for I2C operation


  #define Threshold 40 /* Greater the value,more the sensitivity */



  RTC_DATA_ATTR int bootCount = 0;
  touch_pad_t touchPin;

 class MyServerCallbacks: public BLEServerCallbacks {
     void onConnect(BLEServer* pServer) {
        deviceConnected = true;
  };

    void ondisconnect(BLEServer* pServer) {
       deviceConnected = false;
   }
  };

void init_sensors(){
   dht.begin(); 

   bool status;
   status = bmp.begin(0x76);

   if (!status) {
     Serial.println("Could not find a valid BMP280 sensor,check wiring!");
     while (1);
  }

 }

 /*
 Method to print the reason by which ESP32
 has been awaken from sleep
 */
void print_wakeup_reason(){
   esp_sleep_wakeup_cause_t wakeup_reason;

   wakeup_reason = esp_sleep_get_wakeup_cause();

   switch(wakeup_reason)
   {
     case ESP_SLEEP_WAKEUP_EXT0 : Serial.println("Wakeup caused by external signal using RTC_IO"); 
     break;
     case ESP_SLEEP_WAKEUP_EXT1 : Serial.println("Wakeup caused by external signal using RTC_CNTL"); 
     break;
     case ESP_SLEEP_WAKEUP_TIMER : Serial.println("Wakeup caused by timer"); break;
     case ESP_SLEEP_WAKEUP_TOUCHPAD : Serial.println("Wakeup caused by touchpad"); break;
     case ESP_SLEEP_WAKEUP_ULP : Serial.println("Wakeup caused by ULP program"); break;
     default : Serial.printf("Wakeup was not caused by deep sleep: %d\n",wakeup_reason); break;
    }
 }

 /*
 Method to print the touchpad by which ESP32
 has been awaken from sleep
 */
void print_wakeup_touchpad(){
  touchPin = esp_sleep_get_touchpad_wakeup_status();

  switch(touchPin)
 {
case 0  : Serial.println("Touch detected on GPIO 4"); break;
case 1  : Serial.println("Touch detected on GPIO 0"); break;
case 2  : Serial.println("Touch detected on GPIO 2"); break;
case 3  : Serial.println("Touch detected on GPIO 15"); break;
case 4  : Serial.println("Touch detected on GPIO 13"); break;
case 5  : Serial.println("Touch detected on GPIO 12"); break;
case 6  : Serial.println("Touch detected on GPIO 14"); break;
case 7  : Serial.println("Touch detected on GPIO 27"); break;
case 8  : Serial.println("Touch detected on GPIO 33"); break;
case 9  : Serial.println("Touch detected on GPIO 32"); break;
default : Serial.println("Wakeup not by touchpad"); break;
 }
  }

  void callback(){
     //placeholder callback function
     // notify changed value
    /* init_sensors();
    if (deviceConnected){ 
        uint32_t t = dht.readTemperature();
        uint32_t h = dht.readHumidity();
        uint32_t p = bmp.readPressure();
    
        temp_pCharacteristic->setValue(t);
        temp_pCharacteristic->notify();

        hum_pCharacteristic->setValue(h);
        hum_pCharacteristic->notify();

        pres_pCharacteristic->setValue(p);
        pres_pCharacteristic->notify();
    
        delay(2000); // bluetooth stack will go into congestion,if too many packets are sent,in 6 
        hours test i was able to go as low as 3ms
     }  */
   }

void setup(){
  Serial.begin(115200);

  //Take some time to open up the Serial Monitor
    
   init_sensors(); //apelarea functiei pentru configurarea senzorilor
   delay(2000);
   //   float temp = dht.readTemperature();
   // float hum = dht.readHumidity();
   // float pres = bmp.readPressure();


   // Create the BLE Device
   BLEDevice::init("T");

   // Create the BLE Server
   pServer = BLEDevice::createServer();
   pServer->setCallbacks(new MyServerCallbacks());

   // Create the BLE Service
   BLEService *pService = pServer->createService(bleuUID((uint16_t)0x181A));

   // Create a BLE Characteristic
   temp_pCharacteristic = pService->createCharacteristic(
                          bleuUID((uint16_t)0x2A6E),BLECharacteristic::PROPERTY_READ   |
                          BLECharacteristic::PROPERTY_WRITE  |
                          BLECharacteristic::PROPERTY_NOTIFY |
                          BLECharacteristic::PROPERTY_INDICATE
                          );


   hum_pCharacteristic = pService->createCharacteristic(
                         bleuUID((uint16_t)0x2A6F),BLECharacteristic::PROPERTY_READ   |
                         BLECharacteristic::PROPERTY_WRITE  |
                         BLECharacteristic::PROPERTY_NOTIFY |
                         BLECharacteristic::PROPERTY_INDICATE
                         );




  pres_pCharacteristic = pService->createCharacteristic(
                         bleuUID((uint16_t)0x2A6D),BLECharacteristic::PROPERTY_READ   |
                         BLECharacteristic::PROPERTY_WRITE  |
                         BLECharacteristic::PROPERTY_NOTIFY |
                         BLECharacteristic::PROPERTY_INDICATE
                         );


   // Create a BLE Descriptor
   //hum_pCharacteristic->addDescriptor(new BLE2902());

   // Start the service
   pService->start();

   // Start advertising
   BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
   pAdvertising->addServiceUUID(bleuUID((uint16_t)0x181A));
   pAdvertising->setScanResponse(false);
   pAdvertising->setMinPreferred(0x0);  // set value to 0x00 to not advertise this parameter
   BLEDevice::startAdvertising();
   Serial.println("Waiting a client connection to notify...");


    //Increment boot number and print it every reboot
    ++bootCount;
    Serial.println("Boot number: " + String(bootCount));

    //Print the wakeup reason for ESP32 and touchpad too
    print_wakeup_reason();
    print_wakeup_touchpad();

   //Setup interrupt on Touch Pad 3 (GPIO15)
   touchAttachInterrupt(T3,callback,Threshold);
  //init_sensors();
  if (deviceConnected){ 
    float t = dht.readTemperature(true);
    float h = dht.readHumidity(true);
    float p = bmp.readPressure();
    
    char tStr[10];
    char hStr[10];
    char pStr[10];
    
    sprintf(tStr,"%4.4f",t);
    sprintf(hStr,h);
    sprintf(pStr,p);
    
    temp_pCharacteristic->setValue(tStr);
    temp_pCharacteristic->notify();

    hum_pCharacteristic->setValue(hStr);
    hum_pCharacteristic->notify();

    pres_pCharacteristic->setValue(pStr);
    pres_pCharacteristic->notify();
    
   delay(2000); // bluetooth stack will go into congestion,in 6 hours 
   test i was able to go as low as 3ms
  }

 //delay(2000);
//Serial.println("Temperature: ");
//Serial.print(temp);
//Serial.println("Hummidity: ");
//Serial.print(hum);
//Serial.println("Atmospheric Pressure: ");
//Serial.print(pres);


  delay(30000);   

  //Configure Touchpad as wakeup source
  esp_sleep_enable_touchpad_wakeup();

   //Go to sleep Now
  Serial.println("Going to sleep Now");
  esp_deep_sleep_start();
  Serial.println("This will never be printed");
  }

void loop(){
   //This will never be reached
   }

解决方法

“值字段为空”

您的代码中没有任何名称类似于“值字段”。你指的是

float t = dht.readTemperature(true);

如果是这样，你确定这段代码被执行了吗？也许 deviceConnected 永远不会是真的？

你依赖于这个被执行

 class MyServerCallbacks: public BLEServerCallbacks {
     void onConnect(BLEServer* pServer) {
        deviceConnected = true;
  };

这对我来说看起来很狡猾。方法不应该是公开的吗？无论如何，添加一个打印语句以确保它确实在运行。