Arduino and Nextion won't communicate

Question

I am developing a project using Arduino Uno with DTH Sensor AM2302 and Nextion 4024T032 for display. But after running the program I can't seem to find whats wrong with code. After following steps and process, I come to face an error like this, the Serial Monitor prompts the message " ⸮⸮⸮⸮⸮⸮bkcmd=1⸮⸮⸮page 0⸮⸮⸮ ". I don't know what it means or even what caused the error but due to this the adruino can't communicate with the nextion display.

I know it may seem a simple problem and I guess I just missed a crucial part for setting both of the device. But I really don't know where to start looking now. Wish you could all give me some advice or insights. Thanks.

Regarding on my code I noticed that the error is the result of nexInit() function in the void setup() . When I remove it the error disappears but leaving the arduino and nextion no communication whatsoever.

#include "Nextion.h"
#include "DHT.h"

NexText stat_text = NexText(0,1,"t0");

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

  nexInit(); 
}

void loop(void){

 stat_text.setText ("Server Condition: Normal");

}

I expect the output would be visible in the display which correspond to the object name of GUI in the nextion display.

I have attached the Serial Monitor Error Output. Serial Monitor Error

user11993839 user11993839 · Accepted Answer · 2019-08-29T10:12:16

If you are sure about your arduino code and you are using new library for nextion, you should delete new library and install old library. new library for nextion has problems.

Arduino and Nextion won't communicate

1 Answers