Ok - I found. You have to use #include "M5_ENV.h" and include the library M5UNIT-ENV in Arduino.

Hi,
Very n00b question, but how do I use the ENV III sensor on CoreInk? T
From sample code https://docs.m5stack.com/en/unit/envIII, I tried this but UNIT_ENV.h does not exist on CoreInk

#include "M5CoreInk.h"
#include "UNIT_ENV.h"

SHT3X sht30;
QMP6988 qmp6988;

Same #include "M5_ENV.h" does not exist either.
Thanks.

Hello,
I have written data in the EEPROM of a M5 CoreInk, using EEPROM.write().
How can I erase the entire area? Of course, I can write the area with zeros, but this is going to be long. Is there something like EEPROM.clear() or anything?
Thanks

@aafortinet after more measures, the ultrasonic sensors seems to work correctly. It's just that (1) the units in my program were wrong, (2) it does not work below 2cm and above 150 and gives erroneous answer then. This range isn't very big, and typically I measured 2m.

My ultrasonic sensor reports a bad distance. For example, I measure to the ceiling of the room, and it reports 80 cm where it is above 2 meters.

I have:

• a Ultrasonic range sensor
• a M5 CoreInk. The sensor is connected on GPIO 32 and 33.

This is how I do it. Can you tell me what's wrong or an idea how to debug? thx

#define M5_I2C_ADDR_ULTRASONIC 0x57
Ink_Sprite InkPageSprite(&M5.M5Ink);

void setup() {
  M5.begin(); //Init CoreInk.  
  digitalWrite(LED_EXT_PIN,LOW);
  
  if( !M5.M5Ink.isInit()) //Init CoreInk screen.
  {
    Serial.printf("[-] M5Ink init failed");  
    while (1) delay(100);
  }

  Wire.begin(32,33);
  Serial.printf("[+] Wire begin done\n");

  M5.M5Ink.clear();   //Clear screen. 
  Serial.printf("[+] Clearing eInk screen\n"); 
  delay(1000);

  if( InkPageSprite.creatSprite(0,0,200,200,true) != 0 ){
    Serial.printf("[-] Ink Sprite create failed");
  }
 
}

void loop() {
  static float distance = 0;
  distance = readDistance();
  Serial.printf("Distance=%.1f cm\n",distance);
  if ((distance < 150) && (distance > 0)) {
      char buffer[30];
      sprintf(buffer,"%.1f cm",distance);
      InkPageSprite.drawString(15,150,buffer,&AsciiFont24x48);
      InkPageSprite.pushSprite();
  }

  // Sleep 
  delay(2000);
}

My battery duration seems longer: the program I ran Tuesday is still running "more or less". By "more or less" I mean that sometimes I find the M5 with a black screen, and I have to press the POWER ON button to wake it up. I shouldn't need to do that, so this strange. But at least with the counter displayed on the screen, I know my program ran for 72 hours (indeed more or less 3 days).

Difference with yours:

• I do not connect to a Wifi / Internet (which usually consumes battery quite a lot)

@eddie2070 ok - got the answer for shutdown(): it only works when powered from battery. So, I've created a small test program that just displays an image + counter, then shuts down for 1 hour. I'm going to see how long it lasts...

@felmue said in M5.shutdown(x) does not last x seconds:

the shutdown functionality only works when M5CoreInk is running from battery.

ah haaaaaaaa! ok! Thanks for the remark! Indeed. And now it works (when from battery).

And if somebody wonders, it might be useful to note in the doc that shutdown() actually has the M5 run again the setup() code (it makes sense, as it is "shut-down" but worth mentioning because it changes the way to implement things).

Hi,
Where is the micropython API? Namely, where can I find the content of those:

from m5stack import *
from m5ui import *
from uiflow import *

Among other, I would like to find the API which displays text on the eInk screen of a M5 Core Ink...

Thanks.

NB. I did read this which is interesting and gives a few examples, but it's not an API reference + it doesn't explain how to display on CoreInk...

Found my error. I had flashed the M5 with a program of my own using Arduino. Using the UI Flow firmware, I get the Micropython REPL no problem with screen /dev/ttyUSB0 115200.