BLT temperature sensor

[Swatiharale]

include

include

include

include

include

int sensorPin = 15; OneWire ds(sensorPin);

// BLECharacteristic *pCharacteristic;

bool deviceConnected = false;

int rec=0;

void getTemp(); void BLETransfer(int16_t);

float temperature = -1000;

define enviornmentService BLEUUID((uint16_t)0x181A)

BLECharacteristic temperatureCharacteristic( BLEUUID((uint16_t)0x2A6E), BLECharacteristic::PROPERTY_READ | BLECharacteristic::PROPERTY_NOTIFY ); //BLEDescriptor tempDescriptor(BLEUUID((uint16_t)0x2901));

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

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

};

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

// Create the BLE Device BLEDevice::init("MyESP32");

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

// Create the BLE Service BLEService *pEnviornment = pServer->createService(enviornmentService);

// Create a BLE Characteristic pEnviornment->addCharacteristic(&temperatureCharacteristic);

// https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.descriptor.gatt.client_characteristic_configuration.xml // Create a BLE Descriptor temperatureCharacteristic.addDescriptor(new BLE2902());

BLEDescriptor TemperatureDescriptor(BLEUUID((uint16_t)0x2901)); TemperatureDescriptor.setValue("Temperature -40-60°C"); temperatureCharacteristic.addDescriptor(&TemperatureDescriptor);

pServer->getAdvertising()->addServiceUUID(enviornmentService);

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

// Start advertising pServer->getAdvertising()->start(); Serial.println("Waiting a client connection to notify..."); }

void loop() { getTemp(); Serial.println(temperature); String beaconMsg; if(temperature==-1000) { if(rec>5) { beaconMsg = "ESPSNA"; Serial.println(beaconMsg); temperature = 100000; } return; }

if (deviceConnected) { int16_t value; value = (temperature100); Serial.println(value); // BLETransfer(value); temperatureCharacteristic.setValue((uint8_t)&value, 2); temperatureCharacteristic.notify(); } delay(200); }

void BLETransfer(int16_t val){ temperatureCharacteristic.setValue((uint8_t*)&val, 2); temperatureCharacteristic.notify(); }

void getTemp(){ //returns the temperature from one DS18S20 in DEG Celsius byte data[12]; byte addr[8];

if ( !ds.search(addr)) { //no more sensors on chain, reset search ds.reset_search(); Serial.println("no addr found"); rec++; Serial.println("rec = "+ rec); temperature = -1000; return; }

if ( OneWire::crc8( addr, 7) != addr[7]) { Serial.println("CRC is not valid!"); rec++; Serial.println("rec = "+ rec); temperature = -1000; return; }

if ( addr[0] != 0x10 && addr[0] != 0x28) { Serial.print("Device is not recognized"); rec++; Serial.println("rec = "+ rec); temperature = -1000; return; }

ds.reset(); ds.select(addr); ds.write(0x44,1); // start conversion, with parasite power on at the end

byte present = ds.reset(); ds.select(addr);
ds.write(0xBE); // Read Scratchpad

for (int i = 0; i < 9; i++) { // we need 9 bytes data[i] = ds.read(); }

ds.reset_search();

byte MSB = data[1]; byte LSB = data[0];

float tempRead = ((MSB << 8) | LSB); //using two's compliment float TemperatureSum = tempRead / 16; Serial.println("rec = 0"); rec=0;
temperature = TemperatureSum; }

[Swatiharale]

include

include

include

include

include

int sensorPin = 15; OneWire ds(sensorPin);

// BLECharacteristic *pCharacteristic;

bool deviceConnected = false;

int rec=0;

void getTemp(); void BLETransfer(int16_t);

float temperature = -1000;

define enviornmentService BLEUUID((uint16_t)0x181A)

BLECharacteristic temperatureCharacteristic( BLEUUID((uint16_t)0x2A6E), BLECharacteristic::PROPERTY_READ | BLECharacteristic::PROPERTY_NOTIFY ); //BLEDescriptor tempDescriptor(BLEUUID((uint16_t)0x2901));

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

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

};

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

// Create the BLE Device BLEDevice::init("MyESP32");

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

// Create the BLE Service BLEService *pEnviornment = pServer->createService(enviornmentService);

// Create a BLE Characteristic pEnviornment->addCharacteristic(&temperatureCharacteristic);

// https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.descriptor.gatt.client_characteristic_configuration.xml // Create a BLE Descriptor temperatureCharacteristic.addDescriptor(new BLE2902());

BLEDescriptor TemperatureDescriptor(BLEUUID((uint16_t)0x2901)); TemperatureDescriptor.setValue("Temperature -40-60°C"); temperatureCharacteristic.addDescriptor(&TemperatureDescriptor);

pServer->getAdvertising()->addServiceUUID(enviornmentService);

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

// Start advertising pServer->getAdvertising()->start(); Serial.println("Waiting a client connection to notify..."); }

void loop() { getTemp(); Serial.println(temperature); String beaconMsg; if(temperature==-1000) { if(rec>5) { beaconMsg = "ESPSNA"; Serial.println(beaconMsg); temperature = 100000; } return; }

if (deviceConnected) { int16_t value; value = (temperature100); Serial.println(value); // BLETransfer(value); temperatureCharacteristic.setValue((uint8_t)&value, 2); temperatureCharacteristic.notify(); } delay(200); }

void BLETransfer(int16_t val){ temperatureCharacteristic.setValue((uint8_t*)&val, 2); temperatureCharacteristic.notify(); }

void getTemp(){ //returns the temperature from one DS18S20 in DEG Celsius byte data[12]; byte addr[8];

if ( !ds.search(addr)) { //no more sensors on chain, reset search ds.reset_search(); Serial.println("no addr found"); rec++; Serial.println("rec = "+ rec); temperature = -1000; return; }

if ( OneWire::crc8( addr, 7) != addr[7]) { Serial.println("CRC is not valid!"); rec++; Serial.println("rec = "+ rec); temperature = -1000; return; }

if ( addr[0] != 0x10 && addr[0] != 0x28) { Serial.print("Device is not recognized"); rec++; Serial.println("rec = "+ rec); temperature = -1000; return; }

ds.reset(); ds.select(addr); ds.write(0x44,1); // start conversion, with parasite power on at the end

byte present = ds.reset(); ds.select(addr);
ds.write(0xBE); // Read Scratchpad

for (int i = 0; i < 9; i++) { // we need 9 bytes data[i] = ds.read(); }

ds.reset_search();

byte MSB = data[1]; byte LSB = data[0];

float tempRead = ((MSB << 8) | LSB); //using two's compliment float TemperatureSum = tempRead / 16; Serial.println("rec = 0"); rec=0;
temperature = TemperatureSum; }