Hello,
I am trying to make use of some Arduino MKR Wifi 1010 boards with built in ublox module with BLE.
To get my bearings I am trying to use the peripheral LED example given by the arduino BLE library.
I was very easily able to set up the BLE connection following the IOT tutorial (http://iot.appinventor.mit.edu/assets/tutorials/MIT_App_Inventor_Basic_Connection.pdf)
But moving beyond that I am struggling, from the arduino peripheral LED example if the switch characteristic is written to with any value other than 0 the LED should turn on.
In App Inventor I used the same connection tutorial program to connect to my device and simply added a scan for advertisements and two buttons, one to turn the LED on and the other off.
I can still connect to the arduino and both the app and serial monitor confirm this, but when I use the LED ON button of the app, the arduino switch characteristic does not change. Does anyone know a way if I can check if my app is not writing or if the arduino is not receiving or both? In the screen capture attached below in the app I write integers, but I have also tried with floats, shorts and bytes but none work. Ive also tried both signed and unsigned
a picture of the app inventor block diagram for the LED ON and LED OFF button are attached
And The Arduino peripheral LED example Code is here
/*
LED
This example creates a BLE peripheral with service that contains a
characteristic to control an LED.
The circuit:
- Arduino MKR WiFi 1010 or Arduino Uno WiFi Rev2 board
This example code is in the public domain.
*/
#include <ArduinoBLE.h>
BLEService ledService("19B10000-E8F2-537E-4F6C-D104768A1214"); // BLE LED Service
// BLE LED Switch Characteristic - custom 128-bit UUID, read and writable by central
BLEByteCharacteristic switchCharacteristic("19B10001-E8F2-537E-4F6C-D104768A1214", BLERead | BLEWrite);
const int ledPin = LED_BUILTIN; // pin to use for the LED
void setup() {
Serial.begin(9600);
while (!Serial);
// set LED pin to output mode
pinMode(ledPin, OUTPUT);
// begin initialization
if (!BLE.begin()) {
Serial.println("starting BLE failed!");
while (1);
}
// set advertised local name and service UUID:
BLE.setLocalName("LED");
BLE.setAdvertisedService(ledService);
// add the characteristic to the service
ledService.addCharacteristic(switchCharacteristic);
// add service
BLE.addService(ledService);
// set the initial value for the characeristic:
switchCharacteristic.writeValue(0);
// start advertising
BLE.advertise();
Serial.println("BLE LED Peripheral");
}
void loop() {
// listen for BLE peripherals to connect:x
BLEDevice central = BLE.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());
// while the central is still connected to peripheral:
while (central.connected()) {
Serial.println(switchCharacteristic.written());
// if the remote device wrote to the characteristic,
// use the value to control the LED:
if (switchCharacteristic.written()) {
Serial.println("got something");
Serial.println(switchCharacteristic.value());
if (switchCharacteristic.value()) { // any value other than 0
Serial.println("LED on");
digitalWrite(ledPin, HIGH); // will turn the LED on
} else { // a 0 value
Serial.println(F("LED off"));
digitalWrite(ledPin, LOW); // will turn the LED off
}
}
}
// when the central disconnects, print it out:
Serial.print(F("Disconnected from central: "));
Serial.println(central.address());
}
}
Any Insights are appreciated
Chris
