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Copyright (c) 2015 Intel Corporation. All rights reserved. This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /* This sketch example partially implements the standard Bluetooth Low-Energy Heart Rate service. For more information: https://developer.bluetooth.org/gatt/services/Pages/ServicesHome.aspx */ #include <CurieBle.h> BLEPeripheral blePeripheral; // BLE Peripheral Device (the board you're programming) BLEService heartRateService("180D"); // BLE Heart Rate Service // BLE Heart Rate Measurement Characteristic" BLECharacteristic heartRateChar("2A37", // standard 16-bit characteristic UUID BLERead | BLENotify, 2); // remote clients will be able to get notifications if this characteristic changes // the characteristic is 2 bytes long as the first field needs to be "Flags" as per BLE specifications // https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.blue tooth.characteristic.heart_rate_measurement.xml int oldHeartRate = 0; // last heart rate reading from analog input long previousMillis = 0; // last time the heart rate was checked, in ms void setup() { Serial.begin(9600); // initialize serial communication pinMode(13, OUTPUT); connected // initialize the LED on pin 13 to indicate when a central is /* Set a local name for the BLE device This name will appear in advertising packets and can be used by remote devices to identify this BLE device The name can be changed but maybe be truncated based on space left in advertisement packet */ blePeripheral.setLocalName("HeartRateSketch"); blePeripheral.setAdvertisedServiceUuid(heartRateService.uuid()); // add the service UUID blePeripheral.addAttribute(heartRateService); // Add the BLE Heart Rate service blePeripheral.addAttribute(heartRateChar); // add the Heart Rate Measurement characteristic /* Now activate the BLE device. It will start continuously transmitting BLE advertising packets and will be visible to remote BLE central devices until it receives a new connection */ blePeripheral.begin(); Serial.println("Bluetooth device active, waiting for connections..."); } void loop() { // listen for BLE peripherals to connect: BLECentral central = blePeripheral.central(); // if a central is connected to peripheral: if (central) { Serial.print("Connected to central: "); // print the central's MAC address: Serial.println(central.address()); // turn on the LED to indicate the connection: digitalWrite(13, HIGH); // check the heart rate measurement every 200ms // as long as the central is still connected: while (central.connected()) { long currentMillis = millis(); // if 200ms have passed, check the heart rate measurement: if (currentMillis - previousMillis >= 200) { previousMillis = currentMillis; updateHeartRate(); } } // when the central disconnects, turn off the LED: digitalWrite(13, LOW); Serial.print("Disconnected from central: "); Serial.println(central.address()); } } void updateHeartRate() { /* Read the current voltage level on the A0 analog input pin. This is used here to simulate the heart rate's measurement. */ int heartRateMeasurement = analogRead(A0); int heartRate = map(heartRateMeasurement, 0, 1023, 0, 100); if (heartRate != oldHeartRate) { // if the heart rate has changed Serial.print("Heart Rate is now: "); // print it Serial.println(heartRate); const unsigned char heartRateCharArray[2] = { 0, (char)heartRate }; heartRateChar.setValue(heartRateCharArray, 2); // and update the heart rate measurement characteristic oldHeartRate = heartRate; // save the level for next comparison } }