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Project aiming to do a Bluetooth Low Energy IoT devices, which measure temperature and humidity. Bluetooth achieved with the IDB05A1 shield. Temperature/humidity achieved with a DHT11 sensor. Project working, tested on an STM32 L476 board.
Dependencies: BLE_API X_NUCLEO_IDB0XA1 mbed
main.cpp
- Committer:
- ledonger
- Date:
- 2017-04-07
- Revision:
- 0:d2c18f736df1
- Child:
- 1:023e1eae2048
File content as of revision 0:d2c18f736df1:
/* Tested with a STM32 L476 and the IDB05A1 BLE shield */ #include "mbed.h" #include "ble/BLE.h" #include "DHT11_BLEService.h" #include "DHT11.h" DigitalOut LED(LED1, 0); const static char DEVICE_NAME[] = "DHT11"; static const uint16_t uuid16_list[] = {DHT11Service::DHT11_UUID}; DHT11Service *dht11ServicePtr;//Bluetooth service that manage information and ble updates uint32_t tempValue; uint32_t humiValue; DHT11 dht11(PC_10);//Data pin of the DTH11 sensor Ticker updateTick; void updateData(){ //LED = 1; if(!dht11.readData()){ for(int i = 0; i < 10; i++){LED = !LED; wait_ms(50);} } dht11ServicePtr->updateTemperatureValue(dht11.getTemperature()); dht11ServicePtr->updateHumidityValue(dht11.getHumidity()); //LED = 0; } void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params) { (void)params; BLE::Instance().gap().startAdvertising(); // restart advertising } /** * This callback allows the LEDService to receive updates to the ledState Characteristic. * * @param[in] params * Information about the characterisitc being updated. */ /*void onDataWrittenCallback(const GattWriteCallbackParams *params) { if ((params->handle == ledServicePtr->getValueHandle()) && (params->len == 1)) { actuatedLED = *(params->data); } }*/ /** * This function is called when the ble initialization process has failled */ void onBleInitError(BLE &ble, ble_error_t error) { /* Initialization error handling should go here */ } /** * Callback triggered when the ble initialization process has finished */ void bleInitComplete(BLE::InitializationCompleteCallbackContext *params) { BLE& ble = params->ble; ble_error_t error = params->error; if (error != BLE_ERROR_NONE) { /* In case of error, forward the error handling to onBleInitError */ onBleInitError(ble, error); return; } /* Ensure that it is the default instance of BLE */ if(ble.getInstanceID() != BLE::DEFAULT_INSTANCE) { return; } ble.gap().onDisconnection(disconnectionCallback); //ble.gattServer().onDataWritten(onDataWrittenCallback); tempValue = 20; humiValue = 10; dht11ServicePtr = new DHT11Service(ble, tempValue,humiValue); updateTick.attach(&updateData,5.0); /* setup advertising */ ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::BREDR_NOT_SUPPORTED | GapAdvertisingData::LE_GENERAL_DISCOVERABLE); ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LIST_16BIT_SERVICE_IDS, (uint8_t *)uuid16_list, sizeof(uuid16_list)); ble.gap().accumulateAdvertisingPayload(GapAdvertisingData::COMPLETE_LOCAL_NAME, (uint8_t *)DEVICE_NAME, sizeof(DEVICE_NAME)); ble.gap().setAdvertisingType(GapAdvertisingParams::ADV_CONNECTABLE_UNDIRECTED); ble.gap().setAdvertisingInterval(1000); /* 1000ms. */ ble.gap().startAdvertising(); while (true) { ble.waitForEvent(); } } int main(void) { BLE &ble = BLE::Instance(); ble.init(bleInitComplete); }