In Core2_factory_test.ino you find the following lines (ca. 900) with the magic value 3.2, i.e. battery empty.
They use the variables in their code to make up some nice graphics about battery status.

   float batVoltage = M5.Axp.GetBatVoltage();
    float batPercentage = ( batVoltage < 3.2 ) ? 0 : ( batVoltage - 3.2 ) * 100;

Re: [Core2] make Button disappear
Re: [Core2] make Button disappear

I found the following solution, which works for me (extract only):

Button* button1 = NULL;
// create button
if (button1) delete(button1);
button1 = new Button(0, 0, 158, 80, false);
// disable button
button1->delHandlers(_softButtonEvent);
// the following line is optional, does not change anything if button is deleted
// button1->erase(BLACK); // documentation in M5Button.h -> line 716
delete(button1);

// that trick does it; other approaches did not work reliably
button1 = new Button(0, 0, 0, 0, false, ""); 

I seek for a solution for the following problem.

The code below shows a button handling in Core2.
When the Event is detected I want to get rid of the button, i.e. make the button disappear.
I tried several options, see source code.
What happens is, that the event is disabled.
However when I push in the button area on the TFT the button appearance still behaves by changing colors.
What do I miss here?
Thank you in advance for any hints!

#include <M5Core2.h>

ButtonColors onCol = { TFT_DARKGREY, TFT_WHITE, TFT_WHITE };
ButtonColors offCol = { TFT_WHITE, TFT_BLACK, TFT_WHITE };

Button rt(162, 0, 158, 80, false, "120 sec", onCol, offCol);

void RtBtnTouched(Event& e) {
        Serial.println("Touched!");
		// deactivate button --> three approaches tested so far	   
		rt.delHandlers(RtBtnTouched); 
		rt.hide();
		~rt;		
}

void setup() {
	M5.begin();
	rt.addHandler(RtBtnTouched, E_TOUCH);
	rt.draw();
}

void loop() {
	M5.update();
}

I want to use the M5Timer Library with Core2.
In <M5Timer.h> there are functions having a <numTimer> argument and those without.

Questions:
How can I use

with a certain timer?
I am simply missing the argument "numTimer" in the function.

A working example for Core2 would be helpful.
Thank you in advance.