Posts made by loboris

@stantheman
You don't need to check anything, just configure spi for lower speed.
There is not much sense in using fast spi clock with LoRa module, 1 MHz is probably enough.

BTW, there are some LoRa modules which operates over serial port (UART) which are quite easy to use (like this one or this one).

LoRa-E5 (STM32WLE5JC) Module is also very interesting and supports LoRaWAN too.

@felmue
You can configure SPI to work with (almost) any GPIO on ESP32.

It is quite easy to display any kind of indicator about power state on screen, small (or large) icon, text, etc...

This device has an ePaper display which reflects the light and is readable similarly to the ordinary paper. You will be able to read it in the lighting conditions in which you can read the paper book.
Just turn the light on.
Some (rare) ePaper displays have the frontlight module on top of the display, like this one, but M5Paper does not have such a module.

In case of ESP32 you can measure power consumption with practically any multimeter in uA range.
If the current is < 5-10 uA you have an excelent low power device.
You will rarely need the information about power consumption in sub uA range and investing any amount in a device for measuring current of ESP32 deep sleep mode is probably waste of money (unless you need it for other measurements, of course).

I think it could be also usefull to make available some IT8951 documentation. It is hard to find and could be very usefull for developers.

Data sheet
USB Programming Guide, also relevant for SPI programming.
SPI Programming Guide

Display panel (ED047TC1) data sheet

@zontex said in M5Paper schematic:

@loboris Yup, quick update that after I've made the comment we've discussed and decided to release all schematics as too many of you guys requested it ! all schematics now published in our documentation.

It was a wise decision.

@macias said in M5Paper schematic:

Hello,

Where I can find complete schematic for M5Paper?
I saw it after device was released but now only useless image is available as a schematic. (https://m5stack.oss-cn-shenzhen.aliyuncs.com/resource/docs/schematic/Core/m5paper/M5_PAPER_SCH.pdf)
If anyone has a complete schematic please share it.

Thanks

For me this link works and schematic pdf is returned.
In case anyone have a problem downloading it, you can get it here: https://loboris.eu/ESP32/M5Paper_schematic.pdf

@skink said in M5Paper:

hier kannst Du sie bestellen !! "https://eckstein-shop.de/M5Stack"

eckstein-shop.de: Delivery time : approx. 61 - 63 days

Still 8 in stock for immediate dispatch at Distrelec.

@felmue said in M5Paper power management:

Hello @loboris

if I read the schematics correctly in power off mode signal PS_ON is low, FET2 open, PWR_EN pulled up by R35, FET1 open, VBAT zero and VSYS zero as well, therefore the values of R30 and R33 shouldn't matter since SY7088 is without power. Or am I missing something?

BTW: The RTC will drain the battery even lower as it is directly connected to the battery and runs until 1 volts.

Thanks
Felix

Thank you, I've missed that.
RTC current is <1uA, so it should not be a problem.

@wolli01 said in M5Paper:

It would be nice if I had it too. Unfortunately I can't find a supplier in Germany who delivers it.

Distrelec has 17 left in stock. I've received mine in less than 18 hours (Netherlands -> Croatia)

There is a potential issue with M5Paper power management.
SY7088 boost regulator is used to generate a stable 5V voltage used used for all other voltages.

When the system is in power save and power off modes, resistors R30 & R33 values causes the constant current consumption of ~254 uA which leads to quite rapid battery discharge. At least 10x higher values should be selected. From Data sheet:

it is desirable to choose large resistance values for both
R30 and R33 . A value of between 10kΩ and 1MΩ is
recommended for both resistors.

Furthermore, SY7088 shuts off the output only at ~2.3V which couses battery overdischarge!

I've just received the M5Paper and I can say it is an excelent device with quite a low price for what it includes.

There is only one thing that I'm not quite happy about. The white of the display is much more gray than on any other ePaper display I have (most of them from Waveshare).
Is it because of the touch screen panel or the display itself is like that? Can it be improved?
For the 16 gray levels ePaper it is quite important to have a good contrast ratio.

Congratulations on an excelent product, I think it will be a great success.

@mrtarantl said in Pinout of TFT display:

Thanks :D i am aware of that... I was searching for a pinout of this

The contacts are not damaged, it should be easy to solder it again on the board and it will probably work again...
Of course, if you have minimal soldering skills...

@watson 在 Ideas, helping M5Stack document stuff... 中说：

@kabron
Hey kabron. Fire is not a topsecret. I consider that there are few different between M5Core Basic, M5Core GRAY, M5Fire and the main board(M5Core WHITE) of M5GO. They are simliar to each other. So we just supply the schematic of M5Core Basic.
Please read this doc. I updated it just now.
https://github.com/m5stack/M5-Schematic/blob/master/Core/hardware_diff_between_m5cores.md

If it is not a secret, you should make the schematics of all the boards available. How hard can it be to put them on GitHub or somewhere else. Especially if you want those boards to be used by developers who want to do with them more than just playing with nice boxes.

File Types for 2D Modeling

.dxf: (AutoCAD DXF) (drawing interchange format) is a CAD data file format developed by Autodesk for enabling data exchange and interoperability between AutoCAD and various other programs. It was developed in 1982 and is regarded as a legacy format incapable of storing some modern CAD data.

3D Files for Printing

.STL: STL (STereoLithography) is a file format native to the stereolithography CAD software created by 3D Systems. STL is also known as Standard Tessellation Language. This file format is supported by many other software packages; it is widely used for rapid prototyping and computer-aided manufacturing. STL files describe only the surface geometry of a three-dimensional object without any representation of color, texture or other common CAD model attributes. An STL file describes a raw unstructured triangulated surface by geometries located within a standard Cartesian coordinate system. STL coordinates must be positive numbers, there is no scale information, and the units are arbitrary. All of these facets enable slicing software to interpret the models and produce .gcode files for 3D printer host software.

3D Files for Modeling

.STEP or .stp: refers to a STEP file, which is an abbreviation of: Standard for the Exchange of Product model data. These files represent 3D objects in CAD software, and can contain related information. It was designed as a successor to IGES (.igs), although it has not fully replaced it. STEP files are as close to the universal standard of 3D modeling as is currently available. STEP files are used in many industries and can contain data from the entire life-cycle of a product's design.

From Understanding the Different Types of 3D Files

@ajb2k3 在 M5stack STEP 3D files 中说：

What is Step 3d

Why not enter this question in Google search and get 1000s of answers ?

@lukasmaximus 在 Cahnge Font Size in Python 中说：

Awesome can we share this or do you want to keep the testing to a small number of people?

It should be ready for use, by "testing" I've meant I would like to get some information if any issue is detected or any improvement is wanted.
I've already found a small "bug", if hebrew characters are included the wrong C file is generated (caused by right to left writting), the bynary fon file is OK.

The online font creator is now ready for testing.
More instructions and examples will be added later, but it should work.
Please, test and report the issues.

LoBo Font creator

I have finished the font converter (written in Python) for the font format used in this MicroPython port and it works wery well.
I'm working on the web interface now, the online converter will be available soon on my server, after some more testing.
It will also be available as a standalone Python program (should work on any OS).

Some features:

• Converting any ttf font to C source file which can be compiled with tft.font_compile() or included into the build to be compiled into the firmware is supported

• Converting directly to binary fon file which can be used with tft.font() is also supported

• Convert full ascii character set (32 - 127) or only the selected characters

• Adding characters from cp1252 and cp1250 code pages is supported (more code pages will be probably added later).
  Including characters like Ä, €, ß, Č, Đ, ž, ø, µ, ° is now supported
  I'll try to add support for non-Latin character sets like Cyrillic, Hebrew, Arabic, Chinese, later.

• Font sizes from 8 to 110 pixels are supported

At the moment I don't have enough free time to support conversion to any other format.