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FantomXR

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Posts posted by FantomXR

  1. AINSER deadband configuration?

    in MIDIbox NG

    Posted

    Thanks for your suggestions!

    I'll keep an eye on it again tomorrow. I took a look into the LM317 datasheet and it looks like it needs Vin - Vout = 5V, which is with 5V = Vin not possible. 

    If I want to use another source for Vref, do I just need to change the source for Vref or also for VDD of the MCP3208? And the 10Ohm resistor than is no longer needed?

    Thanks!

  2. AINSER deadband configuration?

    in MIDIbox NG

    Posted

    @Zam: I followed up on this today. Meanwhile I received the new PCBs where the LEDs are not sitting on the fader-PCBs. The jitter has improved a lot. Thanks for the suggestion. I also tried, not using the USB-power directly from a computer which also improved the stability and the jitter-issues. Anyway: If both PCBs (and the core of course) are powered from the same power supply, I still get some jittering. Way less than before. But it's still there. The only solution for now is, to use a totally separate power supply for the LEDs, but share GND with the core & fader PCB. This works great... but I'm not totally satisfied with using two power supplies. 

    I did some experimenting with direct USB-power. Like I wrote it's not good, to power everything from the same port. But, and that is kind of weird, if I use one USB-port for the core & faders / AIN and another USB-port from the same computer for the LEDs, it works great too. I don't think it has something to do with power consumption because I tested it with 16 LEDs at low brightness. They shouldn't draw too much current. 

    I also measured with an oscilloscope. I'm not very experienced with that... but I noticed some voltage drop when switching the colors from the LEDs and it seems that this will influence the AIN. So my question is: Is there a way to power everything from one power supply but add some filtering before the LEDs (or AIN?) ? Do you have any recommendations on this?

    Thanks!
    Chris

  3. Brightness of OLEDs

    in MIDIbox NG

    Posted

    Alright. I found a way to boost the brightness of the OLEDs. 

    It's in the app_lcd.c of the universal-driver folder in line 678 

    APP_LCD_Cmd(0x7f); // middle

    change it to 

    APP_LCD_Cmd(0xff); // high

    done!

    But anyway: My new oleds are still much darker than the other ones.... 

  4. Brightness of OLEDs

    in MIDIbox NG

    Posted

    Hey out there,

    I received another bunch of OLEDs from China and they are much darker than the others I had before. Is there any solution on the software-side for that issue? 
    I don't know what I need to change on the hardware-side / on the OLEDs to make them brighter....

    Thanks,
    Chris

  6. Naming USB-Ports

    in MIDIbox NG

    Posted

    2 minutes ago, Hawkeye said:

    If you need fewer or more virtual USB ports, you can change MIOS32_USB_MIDI_NUM_PORTS.

    Many greets,
    Peter

    Yes, I know. But you have to adjust not only the MIOS32_USB_MIDI_NUM_PORTS. You also have to edit the midi_port.c in the midi_router-folder. Otherwise the terminal will give you error messages about invalid output and input ports if you try to use the midibox-router.

    Thanks for the hint... I'll have a look.

  8. Naming USB-Ports

    in MIDIbox NG

    Posted

    Hey people,

    I'm not sure if this has been asked before (maybe by me?!) but I was not able to find something with the search engine.
    I'd like to know if there is a way to assign individual names to the four USB ports the midibox provides when connecting to a windows computer?

    Thanks,
    Chris

  11. RGB hue sweep

    in MIDIbox NG

    Posted

    It seems that I've got it working. I changed in ws2812.c this line 

    #define WS2812_BUFFER_SIZE      (((WS2812_NUM_LEDS+2)*24)) // +2*24 to insert the RESET frame

    to 

    #define WS2812_BUFFER_SIZE      (((WS2812_NUM_LEDS+2)*24)+200) // +2*24 to insert the RESET frame

    because of the 300us reset, the 2017 WS2812B need.

    The LEDs are now working. I didn't do a mass-test, but it looks promising.

  12. RGB hue sweep

    in MIDIbox NG

    Posted

    There is a post from Adafruit where they report the new LEDs. And they say that they had to adjust the reset-time and everything went well again.

    But in the midibox code I do not see any kind of reset-feature....

  14. RGB hue sweep

    in MIDIbox NG

    Posted

    Hey people,

    I ordered a new bunch of WS2812B LEDs. The problem: They are not working! I tested them in the same environment as the last bunch, which worked great. But the new LEDs do not.
    I at first thought that I received the wrong LEDs. But I doublechecked with an Arduino and they work well on those as well as my old LEDs. 

    I tried to replace the pullup with a 470Ohm and a 10k but both is not working.

    Any ideas?

  18. OLED displays

    in MIDIbox SEQ

    Posted

    Hey people,

    I have a problem with my OLEDs. I can get the first 8 OLEDs working without any problems. But the 9th OLED is mirrored with the 8th. 

    I use the STM32F4 core and I used the 2nd E-line for the 9th display that is available at PC9 of the STM32F4. Do I have to enable this line in the firmware? Can't find anything about it.

    Thanks!

  20. Send sysex to LCD

    in MIDIbox NG

    Posted

    Hey people,

    one more question on this:
    I'd like to clear a specific OLED before displaying the received text. How to achieve that? My problem is: If the newly received text message has less characters than the old, the non-overwritten characters will stay there. I tried a few different things like label=%C, etc. but this is not working at my side. 

    Also it would be enough, if NG just adds some spaces after a received message. So I tried stream="0xf0 0x11 0x22 0x33 0x00 0x00 ^txt 0x20 0x20 0x20 0x20 0xf7" which should output 4 spaces after the text-message... but that's not working.

    Any suggestions?

    Thanks!

  21. After boot MIDIbox sends weird informations

    in MIDIbox NG

    Posted

    Okay, I did some checking.

    The problem with the booting times and the connection-problem is gone if I set single_usb to 0 in the bootloader. So with 4 USB ports the Macbook boots up normally and I can connect and disconnect the midibox without any problems.

    But regarding the topic-problem: This occurs only on KB. NG works fine (as far as I checked it yet). I don't think it's a mac-midi-problem, because I can see it clearly if I open MIOS Studio, that if I press down a key, it sends "(optimized)" and if I release the key it sends the note with the value... so it's working in reverse till I restart the midibox after OS-boot.

  24. AINSER deadband configuration?

    in MIDIbox NG

    Posted

    @Zam: Some more informations on this. Today I tried to use a separate powersupply for the LEDs. The LEDs are still attached to the fader-pcb... I already created a new PCB, but this needs to be produced first. Anyway: the jitter stays... also I found out that the jitter also occurs if the LEDs are not even switched on! Meanwhile I think it's more a problem wit shielding... I took a piece of copper foil, attached a cable to it and connected it to GND. When I put this piece of foil between the LED-strip and the fader the jitter will slow down but does not disappear.

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