sensor/thermostat.ino


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#include <string>
#include <Wire.h>  
#include "SSD1306.h"
#include "DHTesp.h"
#include "BLEDevice.h"
 
static BLEUUID thermo_service_uuid("11111111-2222-3333-4444-000000000000");
static BLEUUID thermo_temp_uuid("11111111-2222-3333-4444-000000000001");
static BLEUUID thermo_time_uuid("11111111-2222-3333-4444-000000000002");
 
#define DEFAULT_SLEEP_TIME 60
/* Conversion factor for micro seconds to seconds */
#define uS_TO_S_FACTOR 1000000
 
SSD1306 display(0x3c, 5, 4);
DHTesp dht;
 
void show(String x) {
  display.clear();
  display.drawString(0,0,x);
  display.display();
}
 
class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
 public:
  BLEAddress* pServerAddress;
 
 MyAdvertisedDeviceCallbacks() :
  BLEAdvertisedDeviceCallbacks(),
    pServerAddress(0)
      {}
  
  void onResult(BLEAdvertisedDevice advertisedDevice) {
    // We have found a device, let us now see if it contains the service we are looking for. 
    String results = "Found: \n";
    results += String(advertisedDevice.getAddress().toString().c_str());
    show(results);
 
    if (advertisedDevice.haveName() && advertisedDevice.getName() == "termostore") {
      advertisedDevice.getScan()->stop();
 
      pServerAddress = new BLEAddress(advertisedDevice.getAddress());
 
    } // Found our server 
  } // onResult 
}; // MyAdvertisedDeviceCallbacks 
 
void read_sensor(float* humidity, float* temperature) {
  dht.setup(13,DHTesp::DHT11);
 
  while (1) {
    delay(dht.getMinimumSamplingPeriod());
    *humidity = dht.getHumidity();
    *temperature = dht.getTemperature();
 
    String data = "";
    data += *humidity;
    data += " ";
    data += *temperature;
    data += " ";
    data += dht.getStatusString();
    show(data);
 
    if (dht.getStatus() != DHTesp::ERROR_TIMEOUT) return;
  }
}
 
uint32_t send_data_and_get_time(BLEAddress* pAddress,String* data) {
  BLEClient* pClient  = BLEDevice::createClient();
  show("Sc");
  pClient->connect(*pAddress);
  show("SC");
  BLERemoteService* pThermoService = pClient->getService(thermo_service_uuid);
  BLERemoteCharacteristic* pTemp = pThermoService->getCharacteristic(thermo_temp_uuid);
  show("SCw");
  pTemp->writeValue(data->c_str(),data->length());
  show("SCWr");
  BLERemoteCharacteristic* pTime = pThermoService->getCharacteristic(thermo_time_uuid);
  std::string next_time = pTime->readValue();
  show("SCWRd");
  pClient->disconnect();
  show("SCWRD");
  return String(next_time.c_str()).toInt();
}
 
void setup() {
  display.init();
  display.connect();
  BLEDevice::init("");
}
 
void loop() {
  display.displayOn();
  display.clear();
 
  BLEScan* pBLEScan = BLEDevice::getScan();
  MyAdvertisedDeviceCallbacks* cb = new MyAdvertisedDeviceCallbacks();
  pBLEScan->setAdvertisedDeviceCallbacks(cb);
  pBLEScan->setActiveScan(true);
  show("s");
  BLEScanResults foundDevices = pBLEScan->start(30);
 
  if (cb->pServerAddress) {
    show("S");
 
    float humidity, temperature;
    read_sensor(&humidity,&temperature);
    String data = String(BLEDevice::getAddress().toString().c_str()) + " " + String(humidity) + " " + String(temperature) + "\n";
    show(data);
    
    int next_time = send_data_and_get_time(cb->pServerAddress,&data);
    String nt = "Next time:";nt+=next_time;
    display.drawString(0,20,nt);display.display();
    delay(2000);
    esp_sleep_enable_timer_wakeup(next_time * uS_TO_S_FACTOR);
  }
  else {
    display.drawString(0,0,"s!");display.display();
    String nt = "Next time:";nt+=DEFAULT_SLEEP_TIME;
    display.drawString(0,20,nt);display.display();
    delay(2000);
    esp_sleep_enable_timer_wakeup(DEFAULT_SLEEP_TIME * uS_TO_S_FACTOR);
  }
 
  esp_deep_sleep_start();
 
  /* display.clear(); */
 
  /* String line; */
  /* line = "T:"; line += temperature; */
  /* display.drawString(0,0,line); */
  /* line = "H:"; line += humidity; */
  /* display.drawString(50,0,line); */
  /* display.drawString(0,10,dht.getStatusString()); */
 
  /* display.drawProgressBar(5,25,120,10,int(temperature)); */
  /* display.drawProgressBar(5,40,120,10,int(humidity)); */
 
  /* display.display(); */
}