switch(receivedValue){
case 0:
digitalWrite(led1, LOW);
break;
case 1:
digitalWrite(led1, HIGH);
break;
case 2:
digitalWrite(led2, HIGH);
break;
case 3:
digitalWrite(led2, LOW);
break;
case 4:
digitalWrite(led3, HIGH);
break;
case 5:
digitalWrite(led3, LOW);
break;
case 6:
digitalWrite(led4, HIGH);
break;
case 7:
digitalWrite(led4, LOW);
break;
}
when my code is like up there it works normally but when i add a second statement like the code below it stops working
switch(receivedValue){
case 0:
digitalWrite(led1, LOW);
break;
case 1:
digitalWrite(led1, HIGH);
digitalWrite(buzz, HIGH);
break;
case 2:
digitalWrite(led2, HIGH);
digitalWrite(buzz, HIGH);
break;
case 3:
digitalWrite(led2, LOW);
break;
case 4:
digitalWrite(led3, HIGH);
digitalWrite(buzz, HIGH);
break;
case 5:
digitalWrite(led3, LOW);
break;
case 6:
digitalWrite(led4, HIGH);
digitalWrite(buzz, HIGH);
break;
case 7:
digitalWrite(led4, LOW);
break;
}
the complete code is
/*
Rui Santos
Complete project details at https://RandomNerdTutorials.com/esp32-web-bluetooth/
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files.
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
*/
#include <BLEDevice.h>
#include <BLEServer.h>
#include <BLEUtils.h>
#include <BLE2902.h>
BLEServer* pServer = NULL;
BLECharacteristic* pSensorCharacteristic = NULL;
BLECharacteristic* pLedCharacteristic = NULL;
bool deviceConnected = false;
bool oldDeviceConnected = false;
uint32_t value = 0;
int led1 = 13;
int led2 = 12;
int led3 = 14;
int led4 = 27;
int btn = 25;
int buzz = 26;
// See the following for generating UUIDs:
// https://www.uuidgenerator.net/
#define SERVICE_UUID "19b10000-e8f2-537e-4f6c-d104768a1214"
#define SENSOR_CHARACTERISTIC_UUID "19b10001-e8f2-537e-4f6c-d104768a1214"
#define LED_CHARACTERISTIC_UUID "19b10002-e8f2-537e-4f6c-d104768a1214"
class MyServerCallbacks: public BLEServerCallbacks {
void onConnect(BLEServer* pServer) {
deviceConnected = true;
};
void onDisconnect(BLEServer* pServer) {
deviceConnected = false;
}
};
class MyCharacteristicCallbacks : public BLECharacteristicCallbacks {
void onWrite(BLECharacteristic* pLedCharacteristic) {
std::string value = pLedCharacteristic->getValue();
if (value.length() > 0) {
int receivedValue = static_cast<int>(value[0]);
Serial.println(receivedValue);
switch(receivedValue){
case 0:
digitalWrite(led1, LOW);
break;
case 1:
digitalWrite(led1, HIGH);
digitalWrite(buzz, HIGH);
break;
case 2:
digitalWrite(led2, HIGH);
break;
case 3:
digitalWrite(led2, LOW);
break;
case 4:
digitalWrite(led3, HIGH);
break;
case 5:
digitalWrite(led3, LOW);
break;
case 6:
digitalWrite(led4, HIGH);
break;
case 7:
digitalWrite(led4, LOW);
break;
}
}
if(digitalRead(btn)== HIGH){
digitalWrite(led1, LOW);
digitalWrite(led2, LOW);
digitalWrite(led3, LOW);
digitalWrite(led4, LOW);
digitalWrite(buzz, LOW);
}
}
};
void setup() {
Serial.begin(115200);
pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
pinMode(led4, OUTPUT);
pinMode(buzz, OUTPUT);
pinMode(btn, INPUT);
// Create the BLE Device
BLEDevice::init("ESP32");
// Create the BLE Server
pServer = BLEDevice::createServer();
pServer->setCallbacks(new MyServerCallbacks());
// Create the BLE Service
BLEService *pService = pServer->createService(SERVICE_UUID);
// Create a BLE Characteristic
pSensorCharacteristic = pService->createCharacteristic(
SENSOR_CHARACTERISTIC_UUID,
BLECharacteristic::PROPERTY_READ |
BLECharacteristic::PROPERTY_WRITE |
BLECharacteristic::PROPERTY_NOTIFY |
BLECharacteristic::PROPERTY_INDICATE
);
// Create the ON button Characteristic
pLedCharacteristic = pService->createCharacteristic(
LED_CHARACTERISTIC_UUID,
BLECharacteristic::PROPERTY_WRITE
);
// Register the callback for the ON button characteristic
pLedCharacteristic->setCallbacks(new MyCharacteristicCallbacks());
// https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.descriptor.gatt.client_characteristic_configuration.xml
// Create a BLE Descriptor
pSensorCharacteristic->addDescriptor(new BLE2902());
pLedCharacteristic->addDescriptor(new BLE2902());
// Start the service
pService->start();
// Start advertising
BLEAdvertising *pAdvertising = BLEDevice::getAdvertising();
pAdvertising->addServiceUUID(SERVICE_UUID);
pAdvertising->setScanResponse(false);
pAdvertising->setMinPreferred(0x0); // set value to 0x00 to not advertise this parameter
BLEDevice::startAdvertising();
Serial.println("Waiting a client connection to notify...");
}
void loop() {
// notify changed value
if (deviceConnected) {
pSensorCharacteristic->setValue(String(value).c_str());
pSensorCharacteristic->notify();
value++;
Serial.print("New value notified: ");
Serial.println(value);
delay(3000); // bluetooth stack will go into congestion, if too many packets are sent, in 6 hours test i was able to go as low as 3ms
}
// disconnecting
if (!deviceConnected && oldDeviceConnected) {
Serial.println("Device disconnected.");
delay(500); // give the bluetooth stack the chance to get things ready
pServer->startAdvertising(); // restart advertising
Serial.println("Start advertising");
oldDeviceConnected = deviceConnected;
}
// connecting
if (deviceConnected && !oldDeviceConnected) {
// do stuff here on connecting
oldDeviceConnected = deviceConnected;
Serial.println("Device Connected");
}
}