hello, I have a problem with the ArduinoBLE library. I'm using the example I found in the peripheral folder "batterymonitor". multiple errors that I can't understand from where exactly? the functions of this library look that they are misused in the example and the errors are like : class "BLEDevice" has no member "address", class "BLEDevice" has no member "connected", class "BLEDevice" has no member "address" . please I need help to fix these errors
Welcome to the forum
Please do not post pictures of code
Please post your sketch, using code tags when you do. This prevents parts of it being interpreted as HTML coding and makes it easier to copy for examination
In my experience the easiest way to tidy up the code and add the code tags is as follows
Start by tidying up your code by using Tools/Auto Format in the IDE to make it easier to read. Then use Edit/Copy for Forum and paste what was copied in a new reply. Code tags will have been added to the code to make it easy to read in the forum thus making it easier to provide help.
void loop() {
// wait for a Bluetooth® Low Energy central
BLEDevice central = BLE.central();
// if a central is connected to the peripheral:
if (central) {
Serial.print("Connected to central: ");
// print the central's BT address:
Serial.println(central.address());
// turn on the LED to indicate the connection:
digitalWrite(LED_BUILTIN, HIGH);
// check the battery level every 200ms
// while the central is connected:
while (central.connected()) {
long currentMillis = millis();
// if 200ms have passed, check the battery level:
if (currentMillis - previousMillis >= 200) {
previousMillis = currentMillis;
updateBatteryLevel();
}
}
// when the central disconnects, turn off the LED:
digitalWrite(LED_BUILTIN, LOW);
Serial.print("Disconnected from central: ");
Serial.println(central.address());
}
}Please post your full sketch, not just part of it
Also let us know for which board you are compiling. And which version of the boards package for that board you have installed.
*
Battery Monitor
This example creates a Bluetooth® Low Energy peripheral with the standard battery service and
level characteristic. The A0 pin is used to calculate the battery level.
The circuit:
- Arduino MKR WiFi 1010, Arduino Uno WiFi Rev2 board, Arduino Nano 33 IoT,
Arduino Nano 33 BLE, or Arduino Nano 33 BLE Sense board.
You can use a generic Bluetooth® Low Energy central app, like LightBlue (iOS and Android) or
nRF Connect (Android), to interact with the services and characteristics
created in this sketch.
This example code is in the public domain.
*/
#include <ArduinoBLE.h>
// Bluetooth® Low Energy Battery Service
BLEService batteryService("180F");
// Bluetooth® Low Energy Battery Level Characteristic
BLEUnsignedCharCharacteristic batteryLevelChar("2A19", // standard 16-bit characteristic UUID
BLERead | BLENotify); // remote clients will be able to get notifications if this characteristic changes
int oldBatteryLevel = 0; // last battery level reading from analog input
long previousMillis = 0; // last time the battery level was checked, in ms
void setup() {
Serial.begin(9600); // initialize serial communication
while (!Serial);
pinMode(LED_BUILTIN, OUTPUT); // initialize the built-in LED pin to indicate when a central is connected
// begin initialization
if (!BLE.begin()) {
Serial.println("starting BLE failed!");
while (1);
}
/* Set a local name for the Bluetooth® Low Energy device
This name will appear in advertising packets
and can be used by remote devices to identify this Bluetooth® Low Energy device
The name can be changed but maybe be truncated based on space left in advertisement packet
*/
BLE.setLocalName("BatteryMonitor");
BLE.setAdvertisedService(batteryService); // add the service UUID
batteryService.addCharacteristic(batteryLevelChar); // add the battery level characteristic
BLE.addService(batteryService); // Add the battery service
batteryLevelChar.writeValue(oldBatteryLevel); // set initial value for this characteristic
/* Start advertising Bluetooth® Low Energy. It will start continuously transmitting Bluetooth® Low Energy
advertising packets and will be visible to remote Bluetooth® Low Energy central devices
until it receives a new connection */
// start advertising
BLE.advertise();
Serial.println("Bluetooth® device active, waiting for connections...");
}
void loop() {
// wait for a Bluetooth® Low Energy central
BLEDevice central = BLE.central();
// if a central is connected to the peripheral:
if (central) {
Serial.print("Connected to central: ");
// print the central's BT address:
Serial.println(central.address());
// turn on the LED to indicate the connection:
digitalWrite(LED_BUILTIN, HIGH);
// check the battery level every 200ms
// while the central is connected:
while (central.connected()) {
long currentMillis = millis();
// if 200ms have passed, check the battery level:
if (currentMillis - previousMillis >= 200) {
previousMillis = currentMillis;
updateBatteryLevel();
}
}
// when the central disconnects, turn off the LED:
digitalWrite(LED_BUILTIN, LOW);
Serial.print("Disconnected from central: ");
Serial.println(central.address());
}
}
void updateBatteryLevel() {
/* Read the current voltage level on the A0 analog input pin.
This is used here to simulate the charge level of a battery.
*/
int battery = analogRead(A0);
int batteryLevel = map(battery, 0, 1023, 0, 100);
if (batteryLevel != oldBatteryLevel) { // if the battery level has changed
Serial.print("Battery Level % is now: "); // print it
Serial.println(batteryLevel);
batteryLevelChar.writeValue(batteryLevel); // and update the battery level characteristic
oldBatteryLevel = batteryLevel; // save the level for next comparison
}
}
this is the full code which taken from the ArduinoBLE examples. I'm using an arduino nano esp32 board . I'm using platformio in vscode
I'm not sure where you lost the first character on the first line. After fixing that first line to / your code compiles fine for an Arduino Nano ESP32.
FQBN: arduino:esp32:nano_nora
Using board 'nano_nora' from platform in folder: C:\Users\bugge\AppData\Local\Arduino15\packages\arduino\hardware\esp32\2.0.18-20240930.arduino3
Using core 'esp32' from platform in folder: C:\Users\bugge\AppData\Local\Arduino15\packages\arduino\hardware\esp32\2.0.18-20240930.arduino3
...
...
Using library ArduinoBLE at version 1.3.7 in folder: C:\Users\bugge\OneDrive\Documents\Arduino\libraries\ArduinoBLE
"C:\\Users\\bugge\\AppData\\Local\\Arduino15\\packages\\esp32\\tools\\xtensa-esp32s3-elf-gcc\\esp-2021r2-patch5-8.4.0/bin/xtensa-esp32s3-elf-size" -A "C:\\Users\\bugge\\AppData\\Local\\Temp\\arduino\\sketches\\06D651FFFC8F647572CAB3007BF75933/sketch_nov5a.ino.elf"
Sketch uses 464709 bytes (14%) of program storage space. Maximum is 3145728 bytes.
Global variables use 38176 bytes (11%) of dynamic memory, leaving 289504 bytes for local variables. Maximum is 327680 bytes.