Unofficial Nextion/TJC User Forum

Change button color arduino

I am trying to change the arduino sketch to use the nextion.h library. I can get it to work for sending a letter from the nextion to my computer. It is also working to use the arduino serial monitor to send a color change to the nextion button.
My issue is that I can’t figure out how to send a color change from serial monitor to nextion with the library.
I am using a promicro with SoftwareSerial.h

#include <Nextion.h> // Nextion Library
#include <SoftwareSerial.h> // Library for Software Serial Port
#include <Keyboard.h> // Keyboard Emulation

SoftwareSerial mySerial(9, 10); // RX, TX

char incomingByte; // for incoming serial data from computer

// This part is used to declare all the objects we can receive from the Nextion Display
// (page, ID, Object name)
NexButton b0 = NexButton(0, 1, “b0”); // “TEST” Button on Page 0

// This part is used to list the possible touchscreen events in an Array
NexTouch *nextion_touch_events[] =
&b0, // Page 0 Button 0
NULL // End string

// This part is for the different functions for Main Screen Touch events (page zero)
void b0PushCallback(void *ptr)
{‘t’); // ‘t’ for TEST
delay(250); // Delay of 250ms to register the key press
Keyboard.release(‘t’); // stop pressing the key

void setup() {
nexInit(); // Nextion Display initalize

// Link the touchscreen events to their relative functions in the code
// attachPush for press events or attachPop for release events


void loop() {

delay(100); // small delay before checking again for touch events
nexLoop(nextion_touch_events); // Check for any touch event and run the associated function

// send data only when you receive data:
if (Serial.available() > 0) {
        // read the incoming byte:
        incomingByte =;
 if (incomingByte == 'b' || incomingByte == 'B')  // turn button 0 white

         if (incomingByte == 'o' || incomingByte == 'O') // turn button 0 green


Forget the library. It’s easier to just send the desired colors:

const char* bt1_bco = "pageConfig.bt1.bco=7158";
const char* nextionEnd = "\xFF\xFF\xFF";

	// Update Nextion

I use the ASCII value to check the code sent from the Nextion which can be installed on one of several serial ports. The MCU can be connected to a PC for debugging.

if ((Serial1.available() > 0) || (Serial2.available() > 0)|| (Serial3.available() > 0))
	incomingByte = SerialRead(serialId);

//#ifdef DEBUG
Serial.print("serialId: ");
Serial.print("incomingByte: ");
//#endif // DEBUG

	// Allow processing time for serial data

	switch (incomingByte)
		//case 33 through 42: Not Used.
		//	break;
		case 41: // ) - Not Used
			// Do something here;

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