multiple SSD1306 Displays

MIDIbox NG
1

Hi Midiboxer!

 

I have a question about connecting multiple SSD1306 displays:

Do i need a 10k resistor and a 10uF cap on every display or would it be enough

if i use just one resistor and one cap on the core board only?

 

Thanks for your advice!

 

Best regards

Marxon

2

I think TK sayed once that one is enough for 32 displays. But i cant find it at the moment on my cellphone.

By the way:

Im documenting my pcb at the moment.

http://www.midibox.org/dokuwiki/doku.php?id=fadercore_-_vlr-8odisp

br, novski

3

Hi novski!

 

Thanks for your info and your board looks nice too!

Do I see correctly that you moved the 595 from the core to the lcd board?

Are short lines from the chip to the displays better? Or is it because an easier chaining of your display boards?

 

Another NG question:

Is it possible to use different LCD types at the same time?

Because i like to use four SSD1306 and two 16x4 displays connected to J15A respectively J15B

but i guess it´s not possible because there are only two “enable” (E) outputs…?

 

Best regards

Marxon

4

Hi Marxon

Well the first question is a bit complicated because the board is made to use for both cases:

  1. Display 1-8, connected to J15A where the 595 is on the Core board

  2. where the Select lines come from a additional SPI on J28 (LPC17Core) mixed with J15B over to max. 3 more 595 shift registers. Those drive a extended Display Range of oled 9-32.

 

In your case the second use case is not needed because you want just 4 oleds. 

If its possible to change the Bootloader so your able to mix the Display types i don’t know. Ask TK for that.

To make that work you wold definitely need 4 more Select lines. Maybe its possible to take those from the additional DOUTs the new STM32F4 Core has onboard …

 

Maybe TK Comes around this post some day. He will now better whats possible…

 

best regards, novski

5

Sorry i made a mistake:

Because i like to use four SSD1306 and two 16x4 displays connected to J15A respectively J15B

Correct are four SSD1306 and two 16x2 Displays

6

MIDIbox NG supports only a single display type.

It’s too difficult to handle different types, dimensions and even graphic modes…

 

Only exception: MIDIbox CV V2 - but I spent a lot of programming effort into this, and I’m using the SSD1306 only for special purposes (oscilloscopes)

 

Best Regards, Thorsten.

7

Hi TK!

 

MIDIbox NG supports only a single display type.

 

 

Oh OK, i did not know that. But that´s no big problem.

To use a second display was anyway an optional idea.

If really needed then i still can use a second core,

But maybe it would be helpfull to mention this “circumstance” in the LCD chapter from the NG manual.

 

 

Have a nice weekend!

 

Best regards

Marxon

8

Now documented in the header of this page: http://www.ucapps.de/midibox_ng_manual_lcd.html

 

Best Regards, Thorsten.

9

Hi Novski and Thorsten!

First thanks to Novski for the PCB, i just need to modify it slightly for my needs (position of pinouts).

(I guess i can use it with this version too..? )

In the wiki you wrote:

 

So all 3 Code Resistors need to be on the Left side…

 

But you changed(soldered) it to IIC Mode..?
 

 

My SSD’s(I bought a “similar” model suggested by Thorsten in the display page) looks different, as you can see…

So would you be so kind and tell me
1.) which mode should be choosen
2.) how should i choose the right mode?

I think this is a new Version…
In the manual of this Version i could see three pins, i guess soldering the middle pin to VCC ->  1, solder it to GND -> 0.
BS1: 1  BS2:0  -> IIC
BS1: 1  BS2:1  -> 8 bit 80xx parallel

 

Has anyone tried this Version of the SSD’s ?

thanks
klaus
 

 

<___base_url___>/gallery/image/2448-ssd1306/?do=embed

10

Hi schoko11

All i know is that i have the jumpers of my JY-MCU type of OLED on BS0,1,2 in 4 Wire SPI mode.

And this core pinout on J2 works: http://beb.digitalaudio.free.fr/RTPMIDI_CORE_STM32_Assembly_Guide.pdf

I tested it yesterday with 16 OLEDs.

Best regards

Novski

11

Hi!

 

Solder BS1 and BS2 to GND.

The missing BS0 is mostly internal connected to GND.

 

Best regards

Marxon

12

Hi!

 

Solder BS1 and BS2 to GND.

The missing BS0 is mostly internal connected to GND.

 

Best regards

Marxon

Yeah thanks, that sounds reasonable…

 

 

I noticed that the pinning is different for my V2 Display :frowning:

So i need to modify novskis PCB, here is the pinout for my display…

(Thanks to him for providing this..)

 

Just for the records…

 

<___base_url___>/gallery/image/2457-ssd1306-v2/?do=embed

13

Wold be nice if you wold provide the modified files after tests… Im quite shure there are others that have those displays as well…

The guys that are currently developing the CV v2 might be delighted about that… :slight_smile:

br,novski

14

Hey people!

I’m in designing a breakout board for the STM. So J15A will be splitted into eight 2x5 pin header at which the OLED displays will be connected directly with a standard ribbon cable.

For that I need the schematic, that shows, how to connect 9-16 displays to the core. I can’t find any schematic for this and it’s hard to see from the schematic of the pcb novski created. I know that I need to add a 74HC595 shift register but I’m not sure, how it has to be connected to the core.

 

Could you please point me in the right direction?

 

Thanks,

Chris

15

Just delete/leave out the 16pin connector J0.

16

Hey!
 

I want to create my own pcb because I need to put the LCDs in another order.

Is there a schematic, that shows the connections?

 

Thanks

Chris

17

Yes its opensource. Have a look in to the wiki page. http://midibox.org/dokuwiki/doku.php?id=fadercore_-_vlr-8odisp

18

hey novski!

 

 

i just wanted to open the eagle files you provided, but i cant open them with eagle 6.1

Error message:

“Error: Line 7, row 18: thats not an eagle file”

 

which version did you use?

 

thanks

klaus

19

If you open it with a text editor you can read the version number. 

Its 6.5 in the case of VLR-8oDispV1.3

can you try to oben it with a demo version of eagle 7.1 or so?

br

novski

20

Works now with V7.1.

I saved the file here with linux and incidently it was the whole website-xml :slight_smile:

Sorry, didn’t look into it irst.

 

The Layout looks really professional(as far as i can say)!

It needs to be as single sided as possible for me, so not sure if my planned adaption would fit other purposes too.

 

I noticed that 3 Ratsnest still needs to be connected? (Some short wires..).

 

When its finished here(need to start first..), i will pm you with the details, e.g. position of the pins and the wiring to the displays will change…

 

br

klaus