Introduction:

In this tutorial we will learn how to get access to your kingview project if you have missed or forget your project password.

Disclaimer: This tutorial is for educational purpose only, please do not use if the project is locked by the third person.

Instructions:

• Step 1: Take backup of your project and make changes to copied files and not to the original program.

• Step 2: Download any hex file editor. (In this tutorial we are using WinHex editor).

• Step 3: Open tagname.db file from program folder with hex editor.

• Step 4: As shown in picture bellow, change these hex values to zero.

• Step 5: Save the tagname.db file in hex editor and close it.

• Step 6: Now you can open the project in kingview software without password.

Note: With this trick, you can get access to project tags and communication data. But you will still need password to get access to the pages. Also you will not be able to change the password without knowing the original password.

If you want to fully unlock the project, you can take paid help from any expert freelancers or you can simply reach out to us with the project files. email

Nextion HMI Designing:
Watch bellow video for complete tutorial on how to operate Nextion HMI graphic designing software.

Arduino Code:
Note: I am using common anode RGB LED for output testing purpose. So I have written this code to operate common anode LED as output. If you want to drive relays instead of LED, you will need to change the code a bit.

/***************************************************************************************************************
*    Nextion HMI Basic Example : Three Buttons
*    Version 1.0
*    Created By: Pranay Sawarkar
*         Email: admin@blog.etechpath.com
*    All Rights Reserved © 2018 www.etechpath.com
*    
*    Download necessary libraries from the links mentioned in download section in the post,
*    Post Link: https://blog.etechpath.com/how-to-interface-nextion-hmi-with-arduino-mega2560-and-learn-how-to-use-nextion-editor-and-program-tags-in-arduino
*
*************************************************************************************************************************/

#include "Nextion.h"
 
int S1 = 2, S2 = 3, S3 = 4;

NexDSButton bt0 = NexDSButton(0, 2, "bt0");
NexDSButton bt1 = NexDSButton(0, 3, "bt1");
NexDSButton bt2 = NexDSButton(0, 4, "bt2");
 
char buffer[100] = {0};
 
NexTouch *nex_listen_list[] = 
{
    &bt0, &bt1, &bt2,
    NULL
};
void setup(void)
{    
    pinMode(2,OUTPUT);
    pinMode(3,OUTPUT);
    pinMode(4,OUTPUT);
    digitalWrite(S1, HIGH);
    digitalWrite(S2, HIGH);
    digitalWrite(S3, HIGH);
    nexInit();
    bt0.attachPop(bt0PopCallback, &bt0);
    bt1.attachPop(bt1PopCallback, &bt1);
    bt2.attachPop(bt2PopCallback, &bt2);
    dbSerialPrintln("setup done"); 
}
void loop(void)
{   
    nexLoop(nex_listen_list);
}
 
void bt0PopCallback(void *ptr)
{
    uint32_t dual_state;
    NexDSButton *btn = (NexDSButton *)ptr;
    dbSerialPrintln("Callback");
    dbSerialPrint("ptr=");
    dbSerialPrintln((uint32_t)ptr); 
    memset(buffer, 0, sizeof(buffer)); 
    bt0.getValue(&dual_state);
    if(dual_state){digitalWrite(S1, LOW);}else{digitalWrite(S1, HIGH);}
}
void bt1PopCallback(void *ptr)
{
    uint32_t dual_state;
    NexDSButton *btn = (NexDSButton *)ptr;    
    dbSerialPrintln("Callback");
    dbSerialPrint("ptr=");
    dbSerialPrintln((uint32_t)ptr); 
    memset(buffer, 0, sizeof(buffer));   
    bt1.getValue(&dual_state); 
    if(dual_state){digitalWrite(S2, LOW);}else{digitalWrite(S2, HIGH);}
}
void bt2PopCallback(void *ptr)
{
    uint32_t dual_state;
    NexSButton *btn = (NexDSButton *)ptr;
    dbSerialPrintln("Callback");
    dbSerialPrint("ptr=");
    dbSerialPrintln((uint32_t)ptr); 
    memset(buffer, 0, sizeof(buffer));
    bt2.getValue(&dual_state);
    if(dual_state){digitalWrite(S3, LOW);}else{digitalWrite(S3, HIGH);}
}

HMI with Arduino working video:

https://www.youtube.com/watch?v=2RTYilN8xvs



Downloads :

Nextion Library

Nextion HMI file

Nextion TFT file

HMI Images

Arduino Code