Jolla OtherHalf OLED display / toholed - maemo.org

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	kimmoli	2014-01-01 , 19:55
	Posts: 562 \| Thanked: 2,744 times \| Joined on Dec 2013 @ Espoo, Finland	#1

SOLD OUT

************************************************** ********************************

Short video at Youtube

Latest pictures, click here

The OLED display is mono gray-white'ish (not blue as seen on some photos)
Size of the display is 0.96" with resolution of 128x64

It has proximity sensor to switch it off when TOH facing down or in your pocket. (has also ambient light sensor which might be used to control brightness (dimm when dark) )

It is controlled by daemon (systemd service) which is installed automatically from Jolla Store like ambience.

Thank you to you all for being so supportive on this project!

Kimmoli

(As already started in http://talk.maemo.org/showpost.php?p...&postcount=232 moved to own thread)

Hooked up an OLED display to Jolla

my I2C probe shows green at 0x3C:

Modified my app a little

and sent some text on the display

And with some more coding, i'm now at this point: watch in Youtube

The display is this here: datasheet
e.g. from Aliexpress

(ordered some bare white ones for the final prototype)

Modified the display by removing the 3.0V regulator, replaced it with silly resistor divider to generate 1.8V logic supply (needed because I2C is 1.8V)

Interface uses ioctl to talk over i2c

Code:

file=open( "/dev/i2c-1", O_RDWR )
ioctl( file, I2C_SLAVE, 0x3c)
write(file, buf, len)

Last edited by kimmoli; 2015-06-01 at 11:10.

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	Daneel	2014-01-01 , 20:14
	Posts: 549 \| Thanked: 698 times \| Joined on Apr 2010	#2

This is great stuff, keep it up

Must be fun tinkering with the Jolla

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	Mikkosssss	2014-01-01 , 21:19
	Posts: 645 \| Thanked: 519 times \| Joined on Apr 2012 @ Finland	#3

Very nice. Missing N9 LPS on my Jolla.

I want make this someday when I have time with keyboard ofc.

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48GX	2014-01-01 , 21:45
Posts: 93 \| Thanked: 172 times \| Joined on Jun 2011	#4

Great work

I disassembled the Jolla to know more about it

regards

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minimos	2014-01-01 , 22:38
Posts: 646 \| Thanked: 1,124 times \| Joined on Jul 2010 @ Espoo, Finland	#5

Originally Posted by 48GX

Great work

http://img14.imageshack.us/img14/8944/s9zo.jpg

I disassembled the Jolla to know more about it

regards

Very interesting!
So, there are seem to be two more contacts in the middle of the body (near +5V and GND contacts) and four contacts on the bottom parts that are not emerging to the surface.
Did you notice if there was some corresponding contact on the inner side of the black cover you removed (probably for some antenna) or are they only test/diag points?

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Wonko	2014-01-01 , 22:57
Posts: 456 \| Thanked: 1,580 times \| Joined on Dec 2009	#6

This is very cool work.

Would be interesting if this or something similar also works with e-ink/epaper displays.

By the way, do you know how much power this setup draws?
Maybe even how the power consumption is split up between the display and the i2c controller?

Personally, I'd love to have something like this just with an e-ink/epaper display (in order to not drain the battery too much).

Edit:
A quick google revealed this:
http://www.youtube.com/watch?v=E05Azzcz5yg
http://www.youtube.com/watch?v=qPaNMrFXsqM
So, it looks like e-ink should be possible too.

Edit2:
Some more links:
http://repaper.org/reference.html
http://www.embeddedartists.com/produ..._27_epaper.php
http://www.watterott.com/de/27-Inch-E-Paper-Display

Edit3:
Another interesting keyword seems to be "chip on glass".
These things are said to be very flat and come with an i2c chip built-in.
http://www.amazon.co.uk/glass-displa.../dp/B006GE8I8U

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Last edited by Wonko; 2014-01-01 at 23:37.

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	kimmoli	2014-01-02 , 00:30
	Posts: 562 \| Thanked: 2,744 times \| Joined on Dec 2013 @ Espoo, Finland	#7

Originally Posted by Wonko

Would be interesting if this or something similar also works with e-ink/epaper displays.

I have done one project with kindle epaper display, and it did need lots of strange voltages, (e.g. +/-15) and somewhat complex interface, maybe easiest to have small processor to manage the drawing to the display itself (arduino tjsp) and just pass image over the i2c.

pros for eINK is to have zero power consumption, and even if having additional cpu for drawing, it needs to be powered on only when updating the screen.

I have also this BADGEr and it is good reference design. maybe worth trying someday with Jolla.

This OLED has actually SSD1306 controller as COG (chip on glass) on it. The PCB where it is connected has only stepup converter which makes +9.5V for the display, but the SSD1306 has internal charge pump so that is not necessarily needed.

ATM power consumption seems to be about 100mW due my bad 1.8V "regulator" and non-optimized settings.
currently doing test how much it will drop my battery % during night. It should be easily get down to 50mW

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	HtheB	2014-01-02 , 00:58
	Moderator \| Posts: 3,718 \| Thanked: 7,419 times \| Joined on Dec 2009 @ Bize Her Yer Trabzon	#8

now this one rocks!
attach it on the back of a hardware keyboard, and this will be instant win!

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	kimmoli	2014-01-02 , 03:45
	Posts: 562 \| Thanked: 2,744 times \| Joined on Dec 2013 @ Espoo, Finland	#9

Didn't get sleep, so started to print...

Knowing it is not going to be perfect is sad after first hour, still ~5h to go.

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minimos	2014-01-02 , 06:47
Posts: 646 \| Thanked: 1,124 times \| Joined on Jul 2010 @ Espoo, Finland	#10

Another display that could be interesting to try, depending on the use case, is the Sharp "memory LCD" e.g. https://www.adafruit.com/products/1393 (low power as an eInk and refresh rate as a LCD).
Although strictly speaking it requires a SPI bus.