@salmanfaris Thanks for the support!!
I finally resolved the error. I have taken FIREBASE_AUTH as apiKey instead of Database secrets.

Hello @Palani, In the Firebase, there are two types of storage,

1. Cloud Firestore (Very recent one & NoSQL database)
2. Realtime Database (To which we upload the data using NodeMCU)

In the Arduino Code, you can see that there is a variable named FIREBASE_AUTH.

This variable should be assigned to the Database secret. This you can find in Project Settings -> Service accounts -> Database Secrets.

My mistake is, i have mistakenly assigned thay to Web API key. This is found at Project Settings -> General.

The error can also occur when u don't initialise a proper realtime database in Firebase. (This is not my case).

Hello all,

I have a small doubt regarding the raw values given by MPU 6050.
I am getting 6 raw values from the MPU 6050 sensor!
I have given a default sensitivity of +/- 2g.
What exactly each value mean? Is it like, voltage values across each axis or capacitance values or the acceleration values itself.
But for me they doesn't mean anything. I am getting some values above 1000, some of them in negative and some doesn't go beyond +/- 250.
So, can you explain me in detail what does those value mean in physical parameters and their units?

Thank you!!

@salmanfaris Yeah, I have checked the cable because I was able to upload to another Arduino Nano. But, I was not able to upload this new Arduino Nano.
I have tried with both bootloader's new and Old... It's not working with both!!
So, any help regarding this?

Please refer to my code and error log and tell the error!!
I have a new version of Arduino Nano and I'm trying to upload code to it. But it's showing the following error. Can u help me rectify it!!

Code:

String str = "";
void setup() {
  Serial.begin(9600); // Starts the serial communication
}

void loop() {
  if(Serial.available() > 0){
    str = Serial.readString();
    Serial.println(str);
    }
}

Error Log:

Build options changed, rebuilding all
Sketch uses 3276 bytes (10%) of program storage space. Maximum is 30720 bytes.
Global variables use 204 bytes (9%) of dynamic memory, leaving 1844 bytes for local variables. Maximum is 2048 bytes.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_cmd(): programmer is out of sync
avr_read(): error reading address 0x0000
    read operation not supported for memory "flash"
avrdude: failed to read all of flash memory, rc=-2
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x00
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x00

Image of Error:

@salmanfaris Thanks for the support!!
I finally resolved the error. I have taken FIREBASE_AUTH as apiKey instead of Database secrets.

@salmanfaris Nothing, No errors!!
Do I need to change anything in Firebase settings or something?

Thanks, @rafitc99. But even this didn't solve my problem!!
I have changed the code in the below format...

#include <ESP8266WiFi.h>
#include <FirebaseArduino.h>       

// Set these to run example.
#define FIREBASE_HOST "syndinnovate-1.firebaseio.com"
#define FIREBASE_AUTH "AIzaS********************7hKQe4uPbfUKHc"
#define WIFI_SSID "SSID"
#define WIFI_PASSWORD "PASS"

void setup() {
  Serial.begin(9600);
  delay(1000);                
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);                                     //try to connect with wifi
  Serial.print("Connecting to ");
  Serial.print(WIFI_SSID);
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
  Serial.println();
  Serial.print("Connected to ");
  Serial.println(WIFI_SSID);
  Serial.print("IP Address is : ");
  Serial.println(WiFi.localIP());                                            //print local IP address
  Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH);                              // connect to firebase                                                               //Start reading dht sensor
}

void loop() {                                                             //Convert RainSensr data into string
  
  Firebase.pushString("/NEW", "No");   
  delay(1000);//setup path and send readings
  Firebase.pushString("/NEW", "Yes");                                //setup path and send readings
  delay(1000);//setup path and send readings
}

Thanks, @salmanfaris, I have solved this error previously. But for me there is no error, code is getting uploaded smoothly but the data is not getting uploaded to the firebase!
Do I have to change any settings in the firebase page? for uploading the data!!

After uploading the code... I have the below log!!

esptool.py v2.6
2.6
esptool.py v2.6
Serial port COM4
Connecting....
Chip is ESP8266EX
Features: WiFi
MAC: 84:f3:eb:58:b5:b7
Uploading stub...
Running stub...
Stub running...
Configuring flash size...
Auto-detected Flash size: 4MB
Compressed 366560 bytes to 260548...

Writing at 0x00000000... (6 %)
Writing at 0x00004000... (12 %)
Writing at 0x00008000... (18 %)
Writing at 0x0000c000... (25 %)
Writing at 0x00010000... (31 %)
Writing at 0x00014000... (37 %)
Writing at 0x00018000... (43 %)
Writing at 0x0001c000... (50 %)
Writing at 0x00020000... (56 %)
Writing at 0x00024000... (62 %)
Writing at 0x00028000... (68 %)
Writing at 0x0002c000... (75 %)
Writing at 0x00030000... (81 %)
Writing at 0x00034000... (87 %)
Writing at 0x00038000... (93 %)
Writing at 0x0003c000... (100 %)
Wrote 366560 bytes (260548 compressed) at 0x00000000 in 23.3 seconds (effective 126.0 kbit/s)...
Hash of data verified.

Leaving...
Hard resetting via RTS pin...

Hello,
I am trying to upload data to firebase but wasn't able to do it. I'm not able to understand the error.
I wanted to update the value of NEW in firebase...
Please refer to my code and firebase tree to solve the error.!!!

#include <ESP8266WiFi.h>
#include <FirebaseArduino.h>       

// Set these to run example.
#define FIREBASE_HOST "syndinnovate-1.firebaseapp.com"
#define FIREBASE_AUTH "AIzaSyAf**********-v7hKQe4uPbfUKHc"
#define WIFI_SSID "Anudeep"
#define WIFI_PASSWORD "Anudeep123"

void setup() {
  Serial.begin(9600);

  // connect to wifi.
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  Serial.print("connecting");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
  Serial.println();
  Serial.print("connected: ");
  Serial.println(WiFi.localIP());
  
  Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH);
}

int n = 0;

void loop() {
  /*
  // set value
  Firebase.setFloat("number", 42.0);
  // handle error
  if (Firebase.failed()) {
      Serial.print("setting /number failed:");
      Serial.println(Firebase.error());  
      return;
  }
  delay(1000);*/
  
  // update value
  Firebase.setFloat("/NEW", 43.0);
  // handle error
  if (Firebase.failed()) {
      Serial.print("setting /number failed:");
      Serial.println(Firebase.error());  
      return;
  }
  delay(1000);
/*
  // get value 
  Serial.print("number: ");
  Serial.println(Firebase.getFloat("number"));
  delay(1000);

  // remove value
  Firebase.remove("number");
  delay(1000);

  // set string value
  Firebase.setString("message", "hello world");
  // handle error
  if (Firebase.failed()) {
      Serial.print("setting /message failed:");
      Serial.println(Firebase.error());  
      return;
  }
  delay(1000);
  
  // set bool value
  Firebase.setBool("truth", false);
  // handle error
  if (Firebase.failed()) {
      Serial.print("setting /truth failed:");
      Serial.println(Firebase.error());  
      return;
  }
  delay(1000);*/

  // append a new value to /logs
  String name = Firebase.pushInt("/NEW", n++);
  // handle error
  if (Firebase.failed()) {
      Serial.print("pushing /logs failed:");
      Serial.println(Firebase.error());  
      return;
  }
  Serial.print("pushed: /logs/");
  Serial.println(name);
  delay(1000);
}