Hey guys, can u all help me what's the problem here? esp8266 with Blynk

Using Arduino Programming Questions
1

it shows this error message
'temperatures' was not declared in this scope

#define BLYNK_TEMPLATE_ID ""
#define BLYNK_DEVICE_NAME ""
#define BLYNK_AUTH_TOKEN "";

#include <Arduino.h>
#include <EEPROM.h>
#include "GravityTDS.h"
#include <OneWire.h>
#include <DallasTemperature.h>
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <SimpleTimer.h>

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "";

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "";
char pass[] = "";
SimpleTimer timer;

#define ONE_WIRE_BUS 7 // Digitalpin where Temp sensor is connected
#define TdsSensorPin A0 // Where Analog pin of TDS sensor is connected to A0 of nodemcu

OneWire oneWire(ONE_WIRE_BUS);
GravityTDS gravityTds;

DallasTemperature sensors(&oneWire);

float tdsValue = 0;

void setup()
{
Serial.begin(115200);
Blynk.begin(auth, ssid, pass);
sensors.begin();
gravityTds.setPin(TdsSensorPin);
gravityTds.setAref(5.0); //reference voltage on ADC, default 5.0V from NodeMCU
gravityTds.setAdcRange(1024); //1024 for 10bit ADC;4096 for 12bit ADC
gravityTds.begin(); //initialization
timer.setInterval(1000L,MainFunction);
}

void loop()
{
Blynk.run();
timer.run(); // Initiates BlynkTimer
}

void MainFunction()
{
sensors.requestTemperatures();
gravityTds.setTemperature(sensors.getTempCByIndex(0)); // grab the temperature from sensor and execute temperature compensation
gravityTds.update(); //calculation done here from gravity library
tdsValue = gravityTds.getTdsValue(); // then get the TDS value

Serial.print("TDS value is:");
Serial.print(tdsValue,0);
Serial.println("ppm");
Serial.print("Temperature is: ");
Serial.print(sensors.getTempCByIndex(0));

// Sensor Values to Blynk application
temperature = sensors.getTempCByIndex(0); //it show this line have error for temperature
Blynk.virtualWrite(V2, temperature);
Blynk.virtualWrite(V3, tdsValue);

}

2

Are you sure about that error message?

Please remember to use code tags when posting code

(I'm with the compiler on this one - I can't see where it is defined either)

3

hi, I don't understand what you mean for Im sure about the error message. But it show the line that temperature does not declare. this is the first time i use esp8266 connect with tds and temperature sensor and send data to Blynk.

4

The error message you quoted says "temperatures", but the undefined variable is "temperature", according to the code you posted.

That's why I asked.

It's possible you posted the wrong error message, or the wrong code.

float temperature = sensors.getTempCByIndex(0);
5

i copy that code from another website and i dont know whats wrong with the code, Cuz this is the first time i try this type of code and i tried compile in the Arduino compiler, it show the error message and i dont know how to fix it.

6

image

7

I posted a possible fix in reply #4, but for future reference, the IDE has a "copy error messages" control for when things go tango uniform - please use it.

Yes, as I suspected, the code you posted originally doesn't match the error message you posted.

This is confusing. Please don't do that again - it wastes time.

Please don't post pictures, post code. In code tags.

8

This is the original code

#define BLYNK_TEMPLATE_ID ""
#define BLYNK_DEVICE_NAME ""
#define BLYNK_AUTH_TOKEN "";

#include <Arduino.h>
#include <EEPROM.h>
#include "GravityTDS.h"
#include <OneWire.h>
#include <DallasTemperature.h>
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <SimpleTimer.h>

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth = "";

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid = "";
char pass = "";
SimpleTimer timer;

#define ONE_WIRE_BUS 7 // Digitalpin where Temp sensor is connected
#define TdsSensorPin A0 // Where Analog pin of TDS sensor is connected to A0 of nodemcu

OneWire oneWire(ONE_WIRE_BUS);
GravityTDS gravityTds;

DallasTemperature sensors(&oneWire);

float tdsValue = 0;

void setup()
{
Serial.begin(115200);
Blynk.begin(auth, ssid, pass);
sensors.begin();
gravityTds.setPin(TdsSensorPin);
gravityTds.setAref(5.0); //reference voltage on ADC, default 5.0V from NodeMCU
gravityTds.setAdcRange(1024); //1024 for 10bit ADC;4096 for 12bit ADC
gravityTds.begin(); //initialization
timer.setInterval(1000L,MainFunction);
}

void loop()
{
Blynk.run();
timer.run(); // Initiates BlynkTimer
}

void MainFunction()
{
sensors.requestTemperatures();
gravityTds.setTemperature(sensors.getTempCByIndex(0)); // grab the temperature from sensor and execute temperature compensation
gravityTds.update(); //calculation done here from gravity library
tdsValue = gravityTds.getTdsValue(); // then get the TDS value

Serial.print("TDS value is:");
Serial.print(tdsValue,0);
Serial.println("ppm");
Serial.print("Temperature is: ");
Serial.print(sensors.getTempCByIndex(0));

// Sensor Values to Blynk application
temperature = sensors.getTempCByIndex(0); 
Blynk.virtualWrite(V2, temperature);
Blynk.virtualWrite(V3, tdsValue);

}
9

I've tried your solution, but still not fix it

10

Look again at reply #4

11

Doesn't look like it. Otherwise the line that gives the error would look like the one in post #4. Or you changed it back because you're convinced #4 was wrong. You never know these days.

12

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