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WiFi status led problem, can't compile

hello people, me again, I’m trying that the wifi status indicator of the wifimanager library is not the one that comes by default “BUILTIN_LED” I want to use another one that I already have in the code, and I can’t compile … "Was not declared in this scope "as I show in the images is well declared, can you help me?

#include <FS.h>    
//#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <DNSServer.h>
#include <ESP8266WebServer.h>
#include <WiFiManager.h> 
#include <ArduinoJson.h>
//for LED status
#include <Ticker.h>
Ticker ticker;
    
//define your default values here, if there are different values in config.json, they are overwritten.
char mqtt_server[40];
char mqtt_port[6] = "8080";
char blynk_token[34] = "zUDZm-EtQq9arxeaE1IJZtAjFi_uCI3L"; 

//flag for saving data
bool shouldSaveConfig = false;

//callback notifying us of the need to save config

void tick()
{
  //toggle state
  int state = digitalRead(indicador);  // get the current state of GPIO1 pin
  digitalWrite(indicador, !state);     // set pin to the opposite state
}

//gets called when WiFiManager enters configuration mode
void configModeCallback (WiFiManager *myWiFiManager) {
  Serial.println("Entered config mode");
  Serial.println(WiFi.softAPIP());
  //if you used auto generated SSID, print it
  Serial.println(myWiFiManager->getConfigPortalSSID());
  //entered config mode, make led toggle faster
  ticker.attach(0.2, tick);
}
void saveConfigCallback () {
  Serial.println("Should save config");
  shouldSaveConfig = true;
  }
// Keep this flag not to re-sync on every reconnection
bool isFirstConnect = true;
// This function will run every time Blynk connection is established
BLYNK_CONNECTED() 
{
  if (isFirstConnect) 
  {
    // Request Blynk server to re-send latest values for all pins
    Blynk.syncAll();
    isFirstConnect = false;
  }
}
bool alarm_mode = false ;
bool verificador = false;
//int led_placa = 2;
int sensor = 5;
int buzzer = 15;
int alarm_led = 4;
int alarm_led_off = 0;
//int boton = 12;
int indicador = 13;
int ledPin = 14;
int contconexion = 0;
int conteoReactivacion = 0;
int ledState = LOW;             // ledState used to set the LED
int VirtualPinA = 3;
int VirtualPinB = 4;
const long interval = 1000;           // interval at which to blink (milliseconds)
unsigned long previousMillis = 0;        // will store last time LED was updated

  BlynkTimer timer;
void myTimerEvent() {
Serial.println("Tiempo des en seg: " + String(conteoReactivacion));
  if (alarm_mode == false) {
    conteoReactivacion++;
    if (conteoReactivacion >= 1800) { //son 30 minutos es 1800 segundos dividido en 3 da 600 segundos por el delay que se le da a V0 de 3000 milisegundos para retrasar el pulso de disparo por 3 segundos
      Blynk.virtualWrite(V1, 1);
      digitalWrite(alarm_led, HIGH);
      digitalWrite(alarm_led_off, LOW);
      alarm_mode = true;
    }
  } else {
    conteoReactivacion = 0;
  }
  if (digitalRead(sensor) == 0) {
    Blynk.virtualWrite(V0, "NORMAL");
    delay(3000);
  }
  if (digitalRead(sensor) == 1)

  {
    Blynk.virtualWrite(V0, "ALERTA");
    
    if (alarm_mode == true)
      //AUTOR ALEXIS MORA
    {
      Blynk.email("ale24cba@gmail.com", "Historial de Alarmas", "Alarma Disparo");
      Blynk.notify("Alarma Disparo");
      digitalWrite(buzzer, HIGH);
      delay(500);
      digitalWrite(buzzer, LOW);
    }
  }
}
BLYNK_WRITE(V1) {
  Serial.println(param.asInt());
  switch (param.asInt()) {
    case 1: {
        alarm_mode = true;
        digitalWrite(alarm_led, HIGH);
        digitalWrite(alarm_led_off, LOW);
        break;
      }
    case 2: {
        alarm_mode = false;
        digitalWrite(buzzer, LOW);
        digitalWrite(alarm_led, LOW);
        digitalWrite(alarm_led_off, HIGH);
        break;
    }    
  }
}

void setup()
{
  pinMode(sensor, INPUT_PULLUP);
  pinMode(buzzer, OUTPUT);
  pinMode(alarm_led, OUTPUT);
  pinMode(alarm_led_off, OUTPUT);
  //pinMode(boton, INPUT);
  pinMode(indicador, OUTPUT);
//  pinMode(led_placa, OUTPUT);
  pinMode(BUILTIN_LED, OUTPUT);
  // start ticker with 0.5 because we start in AP mode and try to connect
  ticker.attach(0.6, tick);

  
  // Debug console
  Serial.begin(115200);
   Serial.println();
   
 
  //clean FS, for testing
  //SPIFFS.format();
 // Blynk.begin(auth, ssid, pass);
  // Setup a function to be called every second
  timer.setInterval(1000L, myTimerEvent);

  // put your setup code here, to run once:
  
  //clean FS, for testing
  //SPIFFS.format();

  //read configuration from FS json
  Serial.println("mounting FS...");

  if (SPIFFS.begin()) {
    Serial.println("mounted file system");
    if (SPIFFS.exists("/config.json")) {
      //file exists, reading and loading
      Serial.println("reading config file");
      File configFile = SPIFFS.open("/config.json", "r");
      if (configFile) {
        Serial.println("opened config file");
        size_t size = configFile.size();
        // Allocate a buffer to store contents of the file.
        std::unique_ptr<char[]> buf(new char[size]);

        configFile.readBytes(buf.get(), size);
        DynamicJsonBuffer jsonBuffer;
        JsonObject& json = jsonBuffer.parseObject(buf.get());
        json.printTo(Serial);
        if (json.success()) {
          Serial.println("\nparsed json");

          //strcpy(mqtt_server, json["mqtt_server"]);
         //strcpy(mqtt_port, json["mqtt_port"]);
          strcpy(blynk_token, json["blynk_token"]);

        } else {
          Serial.println("failed to load json config");
        }
        configFile.close();
      }
    }
  } else {
    Serial.println("failed to mount FS");
  }
  //end read



  // The extra parameters to be configured (can be either global or just in the setup)
  // After connecting, parameter.getValue() will get you the configured value
  // id/name placeholder/prompt default length
  //WiFiManagerParameter custom_mqtt_server("server", "mqtt server", mqtt_server, 40);
  //WiFiManagerParameter custom_mqtt_port("port", "mqtt port", mqtt_port, 6);
  WiFiManagerParameter custom_blynk_token("blynk", "blynk token", blynk_token, 34);

  //WiFiManager
  //Local intialization. Once its business is done, there is no need to keep it around
  WiFiManager wifiManager;

  //set config save notify callback
  wifiManager.setSaveConfigCallback(saveConfigCallback);

  //set static ip
  //wifiManager.setSTAStaticIPConfig(IPAddress(10,0,1,99), IPAddress(10,0,1,1), IPAddress(255,255,255,0));
  
  //add all your parameters here
  //wifiManager.addParameter(&custom_mqtt_server);
  //wifiManager.addParameter(&custom_mqtt_port);
  wifiManager.addParameter(&custom_blynk_token);

  //reset settings - for testing
  //wifiManager.resetSettings(); //borra usuario y contraseña cuando esta linea esta sin comentar al grabar.
  //set callback that gets called when connecting to previous WiFi fails, and enters Access Point mode
  wifiManager.setAPCallback(configModeCallback);
  //set minimu quality of signal so it ignores AP's under that quality
   //  defaults to 8%
  //wifiManager.setMinimumSignalQuality();
  
  //sets timeout until configuration portal gets turned off
  //useful to make it all retry or go to sleep
  //in seconds
  //wifiManager.setTimeout(120);

  //fetches ssid and pass and tries to connect
  //if it does not connect it starts an access point with the specified name
  //here  "AutoConnectAP"
  //and goes into a blocking loop awaiting configuration
  if (!wifiManager.autoConnect("NanoWifi", "12345678")) {
    Serial.println("failed to connect and hit timeout");
    delay(3000);
    //reset and try again, or maybe put it to deep sleep
    ESP.reset();
    delay(5000);
  }

  //if you get here you have connected to the WiFi
  Serial.println("connected...yeey :)");

  //read updated parameters
  //strcpy(mqtt_server, custom_mqtt_server.getValue());
  //strcpy(mqtt_port, custom_mqtt_port.getValue());
  strcpy(blynk_token, custom_blynk_token.getValue());

  //save the custom parameters to FS
  if (shouldSaveConfig) {
    Serial.println("saving config");
    DynamicJsonBuffer jsonBuffer;
    JsonObject& json = jsonBuffer.createObject();
    //json["mqtt_server"] = mqtt_server;
   // json["mqtt_port"] = mqtt_port;
    json["blynk_token"] = blynk_token;

    File configFile = SPIFFS.open("/config.json", "w");
    if (!configFile) {
      Serial.println("failed to open config file for writing");
    }

    json.printTo(Serial);
    json.printTo(configFile);
    configFile.close();
    //end save
  }

 while (WiFi.status() != WL_CONNECTED) {
       int mytimeout = 5;
       delay(500);
       Serial.print(".");
       if((millis() / 1000) > mytimeout ){ // try for less than 6 seconds to connect to WiFi router
         Serial.println(" ");
          break;
        }
   }

   if(WiFi.status() == WL_CONNECTED){  
    //if you get here you have connected to the WiFi
   Serial.println(" ");
   Serial.println("connected to WiFi!! yay :)");
   Serial.println("IP address: ");
   Serial.println(WiFi.localIP()); 
  ticker.detach();
  //keep LED on
  digitalWrite(indicador, LOW);
}
 
 
  Blynk.config(blynk_token);
  bool result = Blynk.connect();

  if (result != true)
  {
  Serial.println("BLYNK Connection Fail");
  Serial.println(blynk_token);
  wifiManager.resetSettings();  
  ESP.reset();
  delay (1000);
  }
    }
  

void loop()
{
  Blynk.run();
  timer.run(); // Initiates BlynkTimer
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;
    if (ledState == LOW) {
      ledState = HIGH;
      Blynk.virtualWrite(VirtualPinA, 0);
      Blynk.virtualWrite(VirtualPinB, 1023);
    } else {
      ledState = LOW;
      Blynk.virtualWrite(VirtualPinA, 1023);
      Blynk.virtualWrite(VirtualPinB, 0);
    }
  }
}

There are quite a few good reasons why it’d best to have your variable declarations at the top of your sketch, and this is one of them.

Also, you’d be far better-off using a BlynkTimer rather than doing all of that millis comparison in your void loop.

Pete.

hello pet, if you are right! but the problem I am trying to solve now is because I cannot compile the code after changing from “BUILTIN_LED” to “indicator” … if “indicator” is well declared in the code…

So have you moved your declarations?

Pete.

:thinking:

you have to declare indicator at the top of your code as Peter said, and all your declaration to avoid same issue with other variables .

Thanks Pet did not understand well what you wanted to say to me for the translation! but if it was solved! It seems that when adding new code, the declarations were being left at the bottom without realizing it, when I moved the declarations I already let myself compile

Yes I already did and it worked, thanks for answering

1 Like

Pet I’m going to read about BlynkTimer as you will see I am very very new to this … in the same way using those millisecond comparisons like this now, can it cause any failure …?

Read this:

Pete.

Pet is worried, I would not like the project to be disconnected because of that error, I follow the example of the link you sent me, I try to implement it but I get this error, surely the code is very badly written, can you help me?
Pet do you need another thread?

#include <FS.h>    
//#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <DNSServer.h>
#include <ESP8266WebServer.h>
#include <WiFiManager.h> 
#include <ArduinoJson.h>
//for LED status
#include <Ticker.h>
Ticker ticker;

bool alarm_mode = false ;
bool verificador = false;
//int led_placa = 2;
int sensor = 5;
int buzzer = 15;
int alarm_led = 4;
int alarm_led_off = 0;
int indicador = 13;
int ledPin = 14;
int contconexion = 0;
int conteoReactivacion = 0;
int ledState = LOW;             // ledState used to set the LED
/*int VirtualPinA = 3;
int VirtualPinB = 4;
const long interval = 1000;           // interval at which to blink (milliseconds)
unsigned long previousMillis = 0;        // will store last time LED was updated
*/
    
//define your default values here, if there are different values in config.json, they are overwritten.
char mqtt_server[40];
char mqtt_port[6] = "8080";
char blynk_token[34] = "zUDZm-EtQq9arxeaE1IJZtAjFi_uCI3L"; 

//flag for saving data
bool shouldSaveConfig = false;

//callback notifying us of the need to save config

void tick()
{
  //toggle state
  int state = digitalRead(indicador);  // get the current state of GPIO1 pin
  digitalWrite(indicador, !state);     // set pin to the opposite state
}


void ledState()
{
  if (ledState == LOW) {
      ledState = HIGH;
      Blynk.virtualWrite(VirtualPinA, 0);
    } else {
      ledState = LOW;
      Blynk.virtualWrite(VirtualPinA, 1023);
   
    }
  }


//gets called when WiFiManager enters configuration mode
void configModeCallback (WiFiManager *myWiFiManager) {
  Serial.println("Entered config mode");
  Serial.println(WiFi.softAPIP());
  //if you used auto generated SSID, print it
  Serial.println(myWiFiManager->getConfigPortalSSID());
  //entered config mode, make led toggle faster
  ticker.attach(0.2, tick);
}
void saveConfigCallback () {
  Serial.println("Should save config");
  shouldSaveConfig = true;
  }
// Keep this flag not to re-sync on every reconnection
bool isFirstConnect = true;
// This function will run every time Blynk connection is established
BLYNK_CONNECTED() 
{
  if (isFirstConnect) 
  {
    // Request Blynk server to re-send latest values for all pins
    Blynk.syncAll();
    isFirstConnect = false;
  }
}

  BlynkTimer timer;
void myTimerEvent() {
Serial.println("Tiempo des en seg: " + String(conteoReactivacion));
  if (alarm_mode == false) {
    conteoReactivacion++;
    if (conteoReactivacion >= 1800) { //son 30 minutos es 1800 segundos dividido en 3 da 600 segundos por el delay que se le da a V0 de 3000 milisegundos para retrasar el pulso de disparo por 3 segundos
      Blynk.virtualWrite(V1, 1);
      digitalWrite(alarm_led, HIGH);
      digitalWrite(alarm_led_off, LOW);
      alarm_mode = true;
    }
  } else {
    conteoReactivacion = 0;
  }
  if (digitalRead(sensor) == 0) {
    Blynk.virtualWrite(V0, "NORMAL");
    delay(3000);
  }
  if (digitalRead(sensor) == 1)

  {
    Blynk.virtualWrite(V0, "ALERTA");
    
    if (alarm_mode == true)
      //AUTOR ALEXIS MORA
    {
      Blynk.email("ale24cba@gmail.com", "Historial de Alarmas", "Alarma Disparo");
      Blynk.notify("Alarma Disparo");
      digitalWrite(buzzer, HIGH);
      delay(500);
      digitalWrite(buzzer, LOW);
    }
  }
}
BLYNK_WRITE(V1) {
  Serial.println(param.asInt());
  switch (param.asInt()) {
    case 1: {
        alarm_mode = true;
        digitalWrite(alarm_led, HIGH);
        digitalWrite(alarm_led_off, LOW);
        break;
      }
    case 2: {
        alarm_mode = false;
        digitalWrite(buzzer, LOW);
        digitalWrite(alarm_led, LOW);
        digitalWrite(alarm_led_off, HIGH);
        break;
    }    
  }
}

void setup()
{
  pinMode(sensor, INPUT_PULLUP);
  pinMode(buzzer, OUTPUT);
  pinMode(alarm_led, OUTPUT);
  pinMode(alarm_led_off, OUTPUT);
  pinMode(indicador, OUTPUT);
//pinMode(led_placa, OUTPUT);
//pinMode(BUILTIN_LED, OUTPUT);
//start ticker with 0.5 because we start in AP mode and try to connect
  ticker.attach(0.6, tick);
 
  // Debug console
  Serial.begin(115200);
   Serial.println();
   
  //clean FS, for testing
  //SPIFFS.format();
 // Blynk.begin(auth, ssid, pass);
  // Setup a function to be called every second
  timer.setInterval(1000L, myTimerEvent);
  timer.setInterval(1000L, ledState); //timer will run every sec 
}

  // put your setup code here, to run once:
  
  //clean FS, for testing
  //SPIFFS.format();

  //read configuration from FS json
  Serial.println("mounting FS...");

  if (SPIFFS.begin()) {
    Serial.println("mounted file system");
    if (SPIFFS.exists("/config.json")) {
      //file exists, reading and loading
      Serial.println("reading config file");
      File configFile = SPIFFS.open("/config.json", "r");
      if (configFile) {
        Serial.println("opened config file");
        size_t size = configFile.size();
        // Allocate a buffer to store contents of the file.
        std::unique_ptr<char[]> buf(new char[size]);

        configFile.readBytes(buf.get(), size);
        DynamicJsonBuffer jsonBuffer;
        JsonObject& json = jsonBuffer.parseObject(buf.get());
        json.printTo(Serial);
        if (json.success()) {
          Serial.println("\nparsed json");

          //strcpy(mqtt_server, json["mqtt_server"]);
         //strcpy(mqtt_port, json["mqtt_port"]);
          strcpy(blynk_token, json["blynk_token"]);

        } else {
          Serial.println("failed to load json config");
        }
        configFile.close();
      }
    }
  } else {
    Serial.println("failed to mount FS");
  }
  //end read

  // The extra parameters to be configured (can be either global or just in the setup)
  // After connecting, parameter.getValue() will get you the configured value
  // id/name placeholder/prompt default length
  //WiFiManagerParameter custom_mqtt_server("server", "mqtt server", mqtt_server, 40);
  //WiFiManagerParameter custom_mqtt_port("port", "mqtt port", mqtt_port, 6);
  WiFiManagerParameter custom_blynk_token("blynk", "blynk token", blynk_token, 34);

  //WiFiManager
  //Local intialization. Once its business is done, there is no need to keep it around
  WiFiManager wifiManager;

  //set config save notify callback
  wifiManager.setSaveConfigCallback(saveConfigCallback);

  //set static ip
  //wifiManager.setSTAStaticIPConfig(IPAddress(10,0,1,99), IPAddress(10,0,1,1), IPAddress(255,255,255,0));
  
  //add all your parameters here
  //wifiManager.addParameter(&custom_mqtt_server);
  //wifiManager.addParameter(&custom_mqtt_port);
  wifiManager.addParameter(&custom_blynk_token);

  //reset settings - for testing
  //wifiManager.resetSettings(); //borra usuario y contraseña cuando esta linea esta sin comentar al grabar.
  //set callback that gets called when connecting to previous WiFi fails, and enters Access Point mode
  wifiManager.setAPCallback(configModeCallback);
  //set minimu quality of signal so it ignores AP's under that quality
   //  defaults to 8%
  //wifiManager.setMinimumSignalQuality();
  
  //sets timeout until configuration portal gets turned off
  //useful to make it all retry or go to sleep
  //in seconds
  //wifiManager.setTimeout(120);

  //fetches ssid and pass and tries to connect
  //if it does not connect it starts an access point with the specified name
  //here  "AutoConnectAP"
  //and goes into a blocking loop awaiting configuration
  if (!wifiManager.autoConnect("NanoWifi", "12345678")) {
    Serial.println("failed to connect and hit timeout");
    delay(3000);
    //reset and try again, or maybe put it to deep sleep
    ESP.reset();
    delay(5000);
  }

  //if you get here you have connected to the WiFi
  Serial.println("connected...yeey :)");

  //read updated parameters
  //strcpy(mqtt_server, custom_mqtt_server.getValue());
  //strcpy(mqtt_port, custom_mqtt_port.getValue());
  strcpy(blynk_token, custom_blynk_token.getValue());

  //save the custom parameters to FS
  if (shouldSaveConfig) {
    Serial.println("saving config");
    DynamicJsonBuffer jsonBuffer;
    JsonObject& json = jsonBuffer.createObject();
    //json["mqtt_server"] = mqtt_server;
   // json["mqtt_port"] = mqtt_port;
    json["blynk_token"] = blynk_token;

    File configFile = SPIFFS.open("/config.json", "w");
    if (!configFile) {
      Serial.println("failed to open config file for writing");
    }

    json.printTo(Serial);
    json.printTo(configFile);
    configFile.close();
    //end save
  }

 while (WiFi.status() != WL_CONNECTED) {
       int mytimeout = 5;
       delay(500);
       Serial.print(".");
       if((millis() / 1000) > mytimeout ){ // try for less than 6 seconds to connect to WiFi router
         Serial.println(" ");
          break;
        }
   }

   if(WiFi.status() == WL_CONNECTED){  
    //if you get here you have connected to the WiFi
   Serial.println(" ");
   Serial.println("connected to WiFi!! yay :)");
   Serial.println("IP address: ");
   Serial.println(WiFi.localIP()); 
  ticker.detach();
  //keep LED on
  digitalWrite(indicador, HIGH);
}
 
  Blynk.config(blynk_token);
  bool result = Blynk.connect();

  if (result != true)
  {
  Serial.println("BLYNK Connection Fail");
  Serial.println(blynk_token);
  wifiManager.resetSettings();  
  ESP.reset();
  delay (1000);
  }
    }
  
void loop()
{
  Blynk.run();
  timer.run(); // Initiates BlynkTimer
  
}

The part of the code that I need to exit the loop as you recommended, is what I use to know the connection status in shared applications, it turns on and off a flashing virtual led in the application as a status indicator

Exactly as the error message says.

Pete.

So put that in a function and call it it with a timer, and remove all of the millis comparison code.

Pete.

sorry but I still don’t understand I don’t understand where the error is

I already removed all the millisecond comparison code

You have a variable and a function with the same name. This isn’t allowed. Rename one of them.

Pete.

Pet Thanks to your help I was able to solve the problem I was able to leave the loop empty! and leave the virtual status led running with BlynkTimer

1 Like