Posts made by ScheduleDisplay

Hello,

I am using Preferences.h to store data on my M5 Stack Paper, such as Wi-Fi credentials, during my application's setup. It was working fine.
During development and testing, I have rewritten the data in Preferences multiple times on this device. However, I recently noticed that new data is no longer being stored in Preferences, even though there is still available space, as confirmed by running the following code.

#include <Preferences.h>
.
.
.

void checkWifiCredentialsAndDecide(){
  preferences.begin("wifiCredentials", false);

 if(debugFlag){
    size_t whatsLeft = preferences.freeEntries();   
    Serial.printf("Available enteries in the namespace table.\n" );
    Serial.println(whatsLeft);
    preferences.putString("test1", "test 1 value"); 
    Serial.println("preferences.getString(test1): " + String(preferences.getString("test1", "Default value")));
 }
.
.
.
}

Output

Available enteries in the namespace table.
127
preferences.getString(test1): Default value // I am expecting to see "test 1 value"

I have read that the NVS (Non-Volatile Storage) has a write cycle limitation of approximately 10,000 to 100,000 cycles.
I have a few questions:
Is there a way to check how many write cycles are remaining?
Can I check if my flash memory is healthy or corrupted?
Is it possible that the flash memory of my M5 Stack Paper has worn out?

Thank you

Hello,
I would like to know if I can run M5stack paper while connected to the battery?
In this case the M5 stack paper will never shutdown, does this damage the M5 stack paper/ESP 32/battery/diaplay etc?

@felmue
Thank you very much for your reply and help.
The code is working now. The M5 paper is now waking up with and without the USB charger connection. :)

Just a quick question. Now we have commented out the below lines, so does that means that the battery will drain out much faster as the M5 paper is in light sleep mode?

M5.shutdown();

M5.disableEXTPower(); 

@felmue Hello,
Thank your for the reply.
I updated the typo and now using the correct GPIO26 pin, but the behavior of E-paper is still the same.

@felmue
Hello,
Today I did some testing with the external button to wakeup the M5 stack paper from the deep sleep mode.
I connect the button at the PORT B of Epaper. please see the attached pictures.

1. Not connected to the charger: The Epaper didn't woke up from the deep sleep, as expected, as you said.

2. Connected with the charger: The Epaper continously keep restarted after executing the shutdown command, until I unplug the button from the PORT B.
   Do you have an idea about this behavior, what is going on with Epaper?

This is the code I am running on Epaper

#include <M5EPD.h>
#include <Arduino.h>

M5EPD_Canvas canvas(&M5.EPD);

#define WAKEUP_PIN_26 26  // GPIO pin on PORT B (G26)
#define WAKEUP_PIN_33 33  // GPIO pin on PORT B (G26)
void setup() {
    wakeupM5OnButtonPressMode();
}

void loop() {
}

void wakeupM5OnButtonPressMode(){  
    M5.begin();
    M5.EPD.SetRotation(90);
    M5.EPD.Clear(true);
    canvas.createCanvas(540, 400);
    canvas.setTextSize(4);

    gpio_hold_dis((gpio_num_t)M5EPD_MAIN_PWR_PIN);
    gpio_deep_sleep_hold_dis();

    // Display battery voltage before shutting down
    Serial.print("\nVoltage before shut down: " + String(M5.getBatteryVoltage() / 1000.0));
    
    // Update the e-ink display with messages
    canvas.drawString("Press button on PORT B to wake up!", 5, 160);
    canvas.drawString("Going to sleep in 5 secs...", 5, 200);
    canvas.pushCanvas(0, 0, UPDATE_MODE_DU4);
    delay(5000);

    // Enter deep sleep
    shutdownEPD();
}

void shutdownEPD() {
    Serial.println("\nShutting down...");
    
    // Display voltage after shutdown (for debugging purposes)
    Serial.print("\nVoltage after shutdown: " + String(M5.getBatteryVoltage() / 1000.0));
    Serial.print("\n*********************************************\n");
    
    // Prepare for deep sleep
    M5.shutdown();                    // Shutdown the display and peripherals
    M5.disableEPDPower();             // Disable e-paper power
    M5.disableEXTPower();             // Disable external power supply
    
    // Configure GPIO for wake-up on button press (PORT B - G26)
    pinMode(WAKEUP_PIN_26, INPUT_PULLUP);  // Enable internal pull-up for stability
    esp_sleep_enable_ext0_wakeup((gpio_num_t)WAKEUP_PIN_33, LOW);  // Wake when pin goes LOW
    
    // Hold power pins to preserve state during deep sleep
    gpio_hold_en((gpio_num_t)M5EPD_MAIN_PWR_PIN);
    gpio_deep_sleep_hold_en();
    
    // Enter deep sleep
    esp_deep_sleep_start();
}

@felmue Thank you very much for your reply.

Hello,
I have understand that the M5 stack paper can wakeup from the shutdown mode by long pressing the side button but sometimes it is not feasible.

Is it possible to configure M5 stack paper in a way that:

1. It will wake up from short press of the side button?
2. It will wake up using Port A, B or C by connecting the external button? e.g this button from M5

Hello,
I am facing the same issue and not able to display the images on to the M5 Paper. I have tried both canvas.drawPngFile(SPIFFS, "/smiley.png", 0, 0);
and canvas.drawJpgFile(SPIFFS, "/smiley.jpg", 0, 0); but no luck.
I already included #include "SPIFFS.h" and initialized SPIFF using M5.begin(true, true, true, true, false);. The png and jpg files are inside the data folder. SPIFFS.open("/smiley.png") is able to open the file however it is not printing any file content on the console.

I think it is required to format the SPIFFS for the first time, as mentioned here so I followed these steps but ESP32 Sketch data upload is not appearing in arduino 2.0.

However I am able to display the png image using canvas.drawPngUrl("http://imageUrl"); but it is taking more time and quite slow.

Could you please help me in understanding what I am doing wrong?
@simonm @felmue

Hello,
I Got the GFX font header file (by converting the Roboto.ttf file). Loaded the font file using canvas.setFreeFont(&Roboto_Medium50pt7b) and then display the text using canvas.printf(textString.c_str());.
It is working fine and display the text properly but when I am giving some special characters äöü then they are not appearing on M5stack paper.
Can someone please guide me what I am doing wrong? Am I missing something?

Thanks

The link to my question can be found here

Hello,
I Got the GFX font header file (by converting the Roboto.ttf file). Loaded the font file using canvas.setFreeFont(&Roboto_Medium50pt7b) and then display the text using canvas.printf(textString.c_str());.
It is working fine and display the text properly but when I am giving some special characters äöü then they are not appearing on M5stack paper.
Can someone please guide me what I am doing wrong? Am I missing something?

Thanks

The link to my question can be found here

Hello,
I Got the GFX font header file (by converting the Roboto.ttf file). Loaded the font file using canvas.setFreeFont(&Roboto_Medium50pt7b) and then display the text using canvas.printf(textString.c_str());.
It is working fine and display the text properly but when I am giving some special characters äöü then they are not appearing on M5stack paper.
Does anyone know what could be the problem? am I missing something?

Thanks

@felmue Hello Felix.
Thank you very much for your help.
I get it working using the hour field with some little changes.

@felmue Hello Felix.
Is it possible to provide me the working code snippet with longer than 4 hours sleep duration?

Or

Can you please check if there is any problem with the code snippet I posted earlier?

Thanks

@felmue Hello Felix.

1. I also already had delay (10) before M5.shutdown();
   Do I2CEnable need to be TRUE in M5 initialization? to use I2C commands?
   I have it False in M5 initialization call M5.begin(true, false, true, true, false);, could this be a problem?
   However, it is working fine if the sleep duration is less than 4 hours

2. M5Paper has 100% battery, I can restart it manually by pressing the side button. The battery is showing as 100%

@felmue I tried longer sleep duration of 9 hours and unfortunately the device didn't wakeup.
Is it possible that M5.RTC.setAlarmIRQ(wakeupDate, wakeupTime); also has a limitaiton of max 4 hours of sleep duration?

@felmue I think 4.35v are somehow coming from the charging cable, because as soon as I connect the charging cable the M5.getBatteryVoltage() / 1000.0 giving me 4.35v but if I remove the charging cable then I get the actual battery voltages e.g 3.8v.
Is it possible that somehow I can read the actual battery voltages even if the device is connected to the charging cable?

@mtylerjr Thanks for your answer. This device is great to have full control but It is not fitting in my use case.

Hello,
I am using this function M5.getBatteryVoltage() / 1000.0; to get the battery information of M5stack-paper and display the remaining battery status on the display. It is giving me the correct value of voltages if the M5Paper is running on a battery.
However, If I connect the M5Paper to the charging cable then this function gives 4.35 vol irrespective of the actual battery status. This displays the incorrect 100% battery status on the display.

Is there a way Or any other function to get the actual correct voltages during the charging? So I can display the battery status correctly

Thanks

Hello Felix,
Thank you very much for your reply.

I updated the code according to your suggestion.

1. I know the actual time so I set the actual date and time of RTC.

  rtc_date_t RTCDate;
  rtc_time_t RTCtime;

  RTCDate.year = year();
  RTCDate.mon  = month();
  RTCDate.day  = day();
  M5.RTC.setDate(&RTCDate);

  RTCtime.hour = hour();
  RTCtime.min  = minute();
  RTCtime.sec  = second();
  M5.RTC.setTime(&RTCtime);

  Serial.print("\n Actual RTC date and time  =>" + String(RTCDate.day) + "-" + String(RTCDate.mon) + "-" + String(RTCDate.year) + " " + String(RTCtime.hour) + ":" + String(RTCtime.min) + ":" + String(RTCtime.sec) );

2. I also know the sleep duration in secs. for example 30 minutes (1800 secs). So I added these secs into the current time to get the wakeup time in the future.

int nextRereshTimeInSecs = now() + 1800;
setTime(nextRereshTimeInSecs);

3. Then I set the alarm using setAlarmIRQ(const rtc_date_t &date, const rtc_time_t &time) and shut down the M5stack-paper.

    rtc_date_t wakeupDate;
    rtc_time_t wakeupTime;

    int currentYear = year();
    int8_t int8_year = currentYear % 100;
    int8_t int8_month = month();
    int8_t int8_day = day(); 
    
    // Populate rtc_date_t structure
    wakeupDate.year = int8_year ;
    wakeupDate.mon = int8_month ;
    wakeupDate.day = int8_day;

    int8_t int8_hour = hour();
    int8_t int8_minute = minute();
    int8_t int8_second = second(); 
    // Populate rtc_time_t structure
    wakeupTime.hour = int8_hour;
    wakeupTime.min = int8_minute;
    wakeupTime.sec = int8_second;

    Serial.print("\n Future RTC date and time  =>" + String(wakeupDate.day) + "-" + String(wakeupDate.mon) + "-" + String(wakeupDate.year) + " " + String(wakeupTime.hour) + ":" + String(wakeupTime.min) + ":" + String(wakeupTime.sec) );

    delay(300);
    M5.RTC.clearIRQ();
    M5.RTC.setAlarmIRQ(wakeupDate, wakeupTime);

    delay(10);
    M5.shutdown();

Currently, I am testing it with the sleep duration of 30 minutes and it looks like working. I will test it for more than 4 hours tonight.

The question is that, do I have to use
M5.shutdown( wakeupDate, wakeupTime)

OR

is it OK what I am currently using
M5.RTC.setAlarmIRQ(wakeupDate, wakeupTime);
M5.shutdown();

I have programmed M5stack-Paper in a way that it connects to the WiFi, read data from Firebase and sleep for provided seconds using "M5.shutdown(Secs)". read documentation here

It is working fine if the sleep duration is less than 4 hours.
If the sleep duration is more than 4 hours then the M5 paper is waking up properly according to the given sleep duration but waking up randomly after 2 - 3 hours .
I also tried "M5.shutdown( const rtc_date_t &RTC_DateStruct, const rtc_time_t &RTC_TimeStruct)" but it didn't work as well.

1. Is there any limitation regarding the sleep duration for M5stack-paper?
2. Is there any other shutdown function which can be used to wake it up for longer durations?