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maemo.org - Talk (https://talk.maemo.org/index.php)
-   The Other Half (https://talk.maemo.org/forumdisplay.php?f=59)
-   -   Jolla OtherHalf OLED display / toholed (https://talk.maemo.org/showthread.php?t=92239)

kimmoli 2014-01-01 19:55
Jolla OtherHalf OLED display / toholed
 
SOLD OUT


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


http://talk.maemo.org/images/icons/icon2.gif 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!





http://talk.maemo.org/image.php?u=69440http://talk.maemo.org/maemo/images/s...ser_online.gif 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:
https://lh4.googleusercontent.com/-T...0101171553.png

Modified my app a little
https://lh6.googleusercontent.com/-v...0101191722.png

and sent some text on the display
https://lh4.googleusercontent.com/-J...o/14010002.jpg

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)

Daneel 2014-01-01 20:14
Re: Jolla OtherHalf OLED display
 
This is great stuff, keep it up :)
Must be fun tinkering with the Jolla

Mikkosssss 2014-01-01 21:19
Re: Jolla OtherHalf OLED display
 
Very nice. Missing N9 LPS on my Jolla. :(
I want make this someday when I have time with keyboard ofc. :)

48GX 2014-01-01 21:45
Re: Jolla OtherHalf OLED display
 
Great work :)

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

I disassembled the Jolla to know more about it :)

regards

minimos 2014-01-01 22:38
Re: Jolla OtherHalf OLED display
 
Quote:
Originally Posted by 48GX (Post 1402857)
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?

Wonko 2014-01-01 22:57
Re: Jolla OtherHalf OLED display
 
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

kimmoli 2014-01-02 00:30
Re: Jolla OtherHalf OLED display
 
Quote:
Originally Posted by Wonko (Post 1402872)
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.
https://lh6.googleusercontent.com/-m...o/13090035.jpg

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

HtheB 2014-01-02 00:58
Re: Jolla OtherHalf OLED display
 
now this one rocks!
attach it on the back of a hardware keyboard, and this will be instant win!

kimmoli 2014-01-02 03:45
Re: Jolla OtherHalf OLED display
 
Didn't get sleep, so started to print...
https://lh4.googleusercontent.com/-Z...o/tohprint.jpg

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

minimos 2014-01-02 06:47
Re: Jolla OtherHalf OLED display
 
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.


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