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    moelski

    @moelski

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    Posts made by moelski

    • Write Text to the Display 90° rotated ?

      Hi,
      is there any way to print rotated text to the screen?
      Like here:
      http://www.miniarduino.com/wp-content/uploads/2017/02/22-tft-lcd-spi-176x220-arduino-counter-1024x768.jpg

      regards
      Dominik

      posted in PRODUCTS
      M
      moelski
    • RE: How to use SPI with the stack ??

      Hi Rob.
      Yes there are 100nF directly at the Power supply of the Mcp3204.
      But that won't help. I Ordered some lm4040 to have a clean voltage reference.
      I think that will help.

      Regards
      Dominik

      posted in PRODUCTS
      M
      moelski
    • RE: How to use SPI with the stack ??

      Hi Guys,
      I think I figured out the main problem.

      It has nothing todo with the SPI bus ... It´s the 3,3V line.
      0_1542533354547_IMG_20181118_102318.jpg

      Take a look at the picture. If you set the LCD to 80 (~33%) brightness then the PWM signal is extremly present on the 3,3v line ... And the MCP3204 don´t like that :-)

      And this is a picture with 255 (100% on) brightness ...
      0_1542533457784_IMG_20181118_102352.jpg

      No further explanation needed ...

      Dominik

      posted in PRODUCTS
      M
      moelski
    • How to use SPI with the stack ??

      Hi guys,

      today I spent some time getting my MCP3204 working. It´s a 4 channel ADC with an SPI Bus.
      I connected the MCP like this:

      #define SPI1_CLK  18  // D -> Clk   -> Pin 11  
      #define SPI1_MISO 19  // Q -> D Out -> Pin 10     
      #define SPI1_MOSI 23  //   -> D In  -> Pin  9    
      #define SPI1_SS   16 //    -> CS    -> Pin  8   
      

      It´s working as expected as far as I don´t use any display stuff from the M5 Stack.

      As soon as I ad the following to my code:

       M5.begin(); // true, false, false);
       M5.Lcd.printf("TEST");
      

      things getting wired. The readings of my MCP3204 are wrong.

      I convert the AD values to temperature vales since I use some BBQ sensors. And the results are about 2 degrees wrong when adding the M5 Display.
      Example: Reading temp without Display -> ~21° and with display ~23° or sometime ~17°
      I can do some addition checks with the plain AD values to get a better understanding.

      But anyway ... What´s wrong in using the SPI bus for a second device?
      Are there any drawbacks i don´t know? Any issues?

      Maybe someone has some explanation for this topic.

      Dominik

      posted in PRODUCTS
      M
      moelski
    • RE: Power on 5V pin when switched off

      Hi ferrianf,

      Some days ago I asked a similar question about powering the stack.
      And until now there are no answers from the M5Stack employees. It's absolutely not understandable why those guys don't answer so important questions. And furthermore why there is no documentation about that power topic. :-(

      Anyway ... Did you take a look into the IP5306 datasheet? Maybe you can find some answers there?

      Sorry if I can help more.

      Dominik

      posted in PRODUCTS
      M
      moelski
    • RE: M5 Data Glove

      Hi,

      @lukasmaximus 在 M5 Data Glove 中说:

      what kind of sensors are you putting in it? flex sensors in the fingers?

      Correct. I use 4 Flex Sensors in the Fingers. They 2,2" types from SparkFun.
      I hope to get them working until sunday ...

      @lukasmaximus 在 M5 Data Glove 中说:

      I made a simple music glove before with flex sensors it was a lot of fun.

      Did you have any photos? How did you sew the glove?
      I found it really hard to get this glove as far as it is now. There are not really a lot of information in the web available ...

      Dominik

      posted in PROJECTS
      M
      moelski
    • M5 Data Glove

      Hi!

      I just wanna show you my new invention ... the M5Stack Data Gloves :-)

      0_1541099763113_IMG_20181101_143415.jpg

      0_1541099775559_IMG_20181101_143504.jpg

      The design based on the DIY arduimu gloves (which you can´t find any longer because the website is down :-( ).
      Anyway. I redesigned some parts, learned sewing and now I`m close to build the sensor stuff.
      I did some work on the code, too ...

      Will keep you up to date if I did my first tests und if the code part is done.

      So be patient :-)

      Dominik

      posted in PROJECTS
      M
      moelski
    • RE: External Power - What is possible?

      @ajb2k3 在 External Power - What is possible? 中说:

      You are aware that there are 2 battery connection on the M5?
      1 is in the 2x15 connection, one is on the actual main pcb.

      Yes I saw that. I think that both directly connected to the VBat connection, correct?!
      0_1540452267316_VBAt Connect.png

      posted in PRODUCTS
      M
      moelski
    • RE: External Power - What is possible?

      @loboris 在 External Power - What is possible? 中说:

      5V connection on the 2x15 connector is the output from IP5306 VOUT pin

      Well if there is no battery connected and no USB cable attached ... Why should this be a problem?
      I would assume that the IP5306 has an internal protection for reverse current.

      posted in PRODUCTS
      M
      moelski
    • RE: External Power - What is possible?

      Hi,
      cutting traces on the PCB is always a bad idea I think ...

      But connecting a 5V source to the 5V connection on the 2x15 connector should be ok, or not? If there is no battery connected we don need the IP5306?

      you should not connect USB cable at the same time the external 5V is connected

      That's correct but this is a compromise I can live with.

      regards Dominik

      posted in PRODUCTS
      M
      moelski