Arduino 101 CurieBLE Battery Monitor

Copy
1/*
2
3 * Copyright (c) 2016 Intel Corporation.  All rights reserved.
4
5 * See the bottom of this file for the license terms.
6
7 */
8
9#include <CurieBLE.h>
10
11/*
12
13   This sketch example partially implements the standard Bluetooth® Low-Energy Battery service.
14
15   For more information: https://developer.bluetooth.org/gatt/services/Pages/ServicesHome.aspx
16
17*/
18
19/*  */
20
21BLEPeripheral blePeripheral;       // BLE Peripheral Device (the board you're programming)
22
23BLEService batteryService("180F"); // BLE Battery Service
24
25// BLE Battery Level Characteristic"
26
27BLEUnsignedCharCharacteristic batteryLevelChar("2A19",  // standard 16-bit characteristic UUID
28
29    BLERead | BLENotify);     // remote clients will be able to
30// get notifications if this characteristic changes
31
32int oldBatteryLevel = 0;  // last battery level reading from analog input
33long previousMillis = 0;  // last time the battery level was checked, in ms
34
35void setup() {
36
37  Serial.begin(9600);    // initialize serial communication
38
39  pinMode(13, OUTPUT);   // initialize the LED on pin 13 to indicate when a central is connected
40
41  /* Set a local name for the BLE device
42
43     This name will appear in advertising packets
44
45     and can be used by remote devices to identify this BLE device
46
47     The name can be changed but maybe be truncated based on space left in advertisement packet */
48
49  blePeripheral.setLocalName("BatteryMonitorSketch");
50
51  blePeripheral.setAdvertisedServiceUuid(batteryService.uuid());  // add the service UUID
52
53  blePeripheral.addAttribute(batteryService);   // Add the BLE Battery service
54
55  blePeripheral.addAttribute(batteryLevelChar); // add the battery level characteristic
56
57  batteryLevelChar.setValue(oldBatteryLevel);   // initial value for this characteristic
58
59  /* Now activate the BLE device.  It will start continuously transmitting BLE
60
61     advertising packets and will be visible to remote BLE central devices
62
63     until it receives a new connection */
64
65  blePeripheral.begin();
66
67  Serial.println(" Bluetooth® device active, waiting for connections...");
68}
69
70void loop() {
71
72  // listen for BLE peripherals to connect:
73
74  BLECentral central = blePeripheral.central();
75
76  // if a central is connected to peripheral:
77
78  if (central) {
79
80    Serial.print("Connected to central: ");
81
82    // print the central's MAC address:
83
84    Serial.println(central.address());
85
86    // turn on the LED to indicate the connection:
87
88    digitalWrite(13, HIGH);
89
90    // check the battery level every 200ms
91
92    // as long as the central is still connected:
93
94    while (central.connected()) {
95
96      long currentMillis = millis();
97
98      // if 200ms have passed, check the battery level:
99
100      if (currentMillis - previousMillis >= 200) {
101
102        previousMillis = currentMillis;
103
104        updateBatteryLevel();
105
106      }
107
108    }
109
110    // when the central disconnects, turn off the LED:
111
112    digitalWrite(13, LOW);
113
114    Serial.print("Disconnected from central: ");
115
116    Serial.println(central.address());
117
118  }
119}
120
121void updateBatteryLevel() {
122
123  /* Read the current voltage level on the A0 analog input pin.
124
125     This is used here to simulate the charge level of a battery.
126
127  */
128
129  int battery = analogRead(A0);
130
131  int batteryLevel = map(battery, 0, 1023, 0, 100);
132
133  if (batteryLevel != oldBatteryLevel) {      // if the battery level has changed
134
135    Serial.print("Battery Level % is now: "); // print it
136
137    Serial.println(batteryLevel);
138
139    batteryLevelChar.setValue(batteryLevel);  // and update the battery level characteristic
140
141    oldBatteryLevel = batteryLevel;           // save the level for next comparison
142
143  }
144}
145
146/*
147
148   Copyright (c) 2016 Intel Corporation.  All rights reserved.
149
150   This library is free software; you can redistribute it and/or
151
152   modify it under the terms of the GNU Lesser General Public
153
154   License as published by the Free Software Foundation; either
155
156   version 2.1 of the License, or (at your option) any later version.
157
158   This library is distributed in the hope that it will be useful,
159
160   but WITHOUT ANY WARRANTY; without even the implied warranty of
161
162   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
163
164   Lesser General Public License for more details.
165
166   You should have received a copy of the GNU Lesser General Public
167
168   License along with this library; if not, write to the Free Software
169
170   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
171
172*/