error in linking my code to blynk iot mobile app

Development Platforms
1

i tried to compile this code in the arduino ide but it keep saying:
‘class BlynkWifi’ has no member named ‘virtualRead’ did you mean ‘virtualWrite’?
any help in fixing this error !!, remember im using an esp32 board the code i uses is the following

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

// WiFi credentials
char ssid[] = "your_SSID";
char pass[] = "your_PASSWORD";

// Blynk authentication token
char auth[] = "your_AUTH_TOKEN";

// IR sensor pins
int sensor1 = 2;
int sensor2 = 3;
int sensor3 = 4;
int sensor4 = 5;

// Servo motor pin
int servoPin = 12;

// LCD pins
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Servo motor object
Servo servo;

void setup() {
  // Initialize serial communication
  Serial.begin(9600);

  // Initialize WiFi connection
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }

  // Initialize Blynk connection
  Blynk.begin(auth, WiFi.SSID().c_str(), WiFi.psk().c_str());

  // Initialize IR sensor pins as inputs
  pinMode(sensor1, INPUT);
  pinMode(sensor2, INPUT);
  pinMode(sensor3, INPUT);
  pinMode(sensor4, INPUT);

  // Initialize servo motor pin as output
  pinMode(servoPin, OUTPUT);

  // Attach servo motor to pin
  servo.attach(servoPin);

  // Initialize LCD
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Smart Parking");
}

void loop() {
  // Read IR sensor values
  int value1 = digitalRead(sensor1);
  int value2 = digitalRead(sensor2);
  int value3 = digitalRead(sensor3);
  int value4 = digitalRead(sensor4);

  // Check if parking spots are available
  if (value1 == LOW || value2 == LOW || value3 == LOW || value4 == LOW) {
    // Display available spots on LCD
    lcd.setCursor(0, 1);
    lcd.print("Available: ");
    lcd.print(value1 == LOW ? "1 " : "");
    lcd.print(value2 == LOW ? "2 " : "");
    lcd.print(value3 == LOW ? "3 " : "");
    lcd.print(value4 == LOW ? "4 " : "");

    // Wait for reservation from Blynk app
    while (Blynk.connected()) {
      Blynk.run();
      if (Blynk.virtualRead(1) == 1) {
        // Reserve parking spot
        int spot = Blynk.virtualRead(2).asInt();
        if (spot == 1) {
          servo.write(0);
          delay(1000);
          lcd.setCursor(0, 1);
          lcd.print("Reserved: 1     ");
        } else if (spot == 2) {
          servo.write(45);
          delay(1000);
          lcd.setCursor(0, 1);
          lcd.print("Reserved: 2     ");
        } else if (spot == 3) {
          servo.write(90);
          delay(1000);
          lcd.setCursor(0, 1);
          lcd.print("Reserved: 3     ");
        } else if (spot == 4) {
          servo.write(135);
          delay(1000);
          lcd.setCursor(0, 1);
          lcd.print("Reserved: 4     ");
        }
        break;
      }
    }
  } else {
    // Display no available spots on LCD
    lcd.setCursor(0, 1);
    lcd.print("No available spots");
  }
}
2

And what’s the platformio.ini?

3

It appears, from this old forum post, Reading a Blynk Virtual Pin - #2 by gfvalvo - Programming Questions - Arduino Forum, that in order to read the state of a virtual pin, you have to use the BLYNK_WRITE() callback method. There have been requests since at least2015 for a vrtualRead() function.

Cheers,
Norm.

4

what you mean i don’t undrestand you ?

5

i need your help can i message you ?

6

You can message me, but I don’t use Blynk, plus, I will be out of contact for the next three weeks or so, I will not have email, internet or wifi where I’m off to.

It appears, from looking at Blynk source code, and from the Blynk support forum, that virtualRead does indeed, not exist. Instead, as the link I posted to the Arduino forum suggests, you have to use a callback function if you want to read a virtual pin. There’s an example given in the link.

Also, are you aware that this is a support forum for the PlatformIO development system and not for the Arduino.

Cheers,
Norm.