1.5" LCDs for Smartwatch

Status
Not open for further replies.
Ummm, generally it is a bad idea to post the same questions to multiple sub-forums (i.e. General Discussion, Project Guidance, and Technical Support). That tends to mark you as a spammer.

Off hand, none of them have connectors that are easy to mate with the Teensy. You probably need an intermediate device that takes the flat ribbon cable, and breaks it out into pins to connect to the Teensy.
 
Last edited:
There is a thread about pi watch on the forum, you might want to look it up (I'm short of funds right now, so I haven't been paying attention to it). Unfortunately, unless enough people can pledge to $32,720 in the next 6 days, the kickstarter project will fail (kickstarter is an all or nothing system, if the project doesn't make the goal, the backers get nothing).

There are various small lcds that work as output devices to the Teensy, but I'm not familar with any that provides a touch screen. This display from dig-ole (http://www.digole.com/index.php?productID=882) is one such. I've used it in test mode, and it works well as a serial device. I don't recall if I tried it as an i2c device (probably at some stage I did). I have not used it as a spi device.
 
well all i need than is just wiring or some kind of scheme how to connect just lcd to arduino...the round one is fine .They did it so its possible, the question is how?
thank you for the link it nice lcd but i would really like something with a bit more resolution, u know what i mean, like this one which is 220x220 in 1.5" diameter , thats very nice :)
 
The first display module is one with an ILI9341C controller. You can find a lot of different displays with an ILI9341(C?) controller. They have all different connectors with different connector assignment. And often, these alibaba offers are incorrect and lack information. - You have to ask the alibaba seller for more details.
As long as the ILI9341C is similar to the ILI9341 (without C) controller here is an example scheme of one possible way to connect the lcd (from another vendor): http://www.buydisplay.com/download/interfacing/ER-TFT028-4_Interfacing.pdf.

To write the software is more difficult!
 
HI.
Sadly the Pi Watch did not reach funding However they did leave a wealth of information around.
Here is the GitHub links that they used for the display drivers. https://github.com/ipaq3115/PiWatch
This link talks about the display and had some Eagle files for it https://www.igorkromin.net/index.ph...-138-inch-30pin-tft-round-colour-lcd-r61505v/
And here is a link to their Pi Watch development showing the Round LCD https://www.kickstarter.com/project...rammable-open-source-smartwatch/posts/1096837
And finally a link on Hackaday.io with a high rest picture of the display connected to the Teensy 3.1 processor https://hackaday.io/project/3666-the-pi-watch

I think with these link one could start to get one going.
Dave
 
I wroted a library for ILI9341C with some variants, basically this display support several screen sizes so I provided some support for adapt the most around.
https://github.com/sumotoy/TFT_ILI9163C .The last Pi Watch with round screen uses the R61505V controller, same code of ili9320, 8/16bit parallel so it will use most of the teensy pins but I don't think it will be a big problem for a watch.This one http://www.alibaba.com/product-deta...559391.html?spm=a2700.7724838.35.1.XIvp02&s=p uses SPI (ST7789H2) and has capacitive touch as well, I've coded the library for a friend(for teensy 3 only) time ago and I should have somewhere.
 
Many thanks for the info. The Alibaba product seems interesting because it has a built in SPI interface. However it does seem to cut off the display at the bottom.

I was looking through my 'bits' box last night and I have found 1 .1mm header adapter so I will beable to give the parallel one a ry.
Only thing is that it is 2.8v

My interest is to provide 'fun' eyes for mascot costumes so that the character can display various images/sprites to enhance the action :)

Thanks for your prompt reply :)
Dave
 
First of all, the Alibaba product looks interesting, but given the minimum order is 500, it is out of my league.

For eyes, you might want to use a square/rectangular display and just put an eye mask over the outer edges, and just not program the outer edges.

I picked up 2 of these small digi-ole displays that were fairly small (I believe they fit inside of an Adafruit neopixel 16-LED ring), but I haven't really had time to hack for the last few months, and I had forgotten about them: http://www.digole.com/index.php?productID=882.

Also, you can get the 8x8 LEDs from Adafruit with i2c backpack (https://www.adafruit.com/search?q=mini+8x8+backpack). This tutorial page covers animating the eyes (https://learn.adafruit.com/animating-multiple-led-backpacks).
 
Last edited:
Hi Micheal.
Thanks for the interest I've a bit ahead of you at the moment re development..

These are some of my own eyes that I have made using OLED,s and driven by a Teensy 3.1
https://www.youtube.com/watch?v=NLOWiznV5pg

I was interested in these circular ones as it would make the development for more flatter units easier esp as would meand that a mask would not be needed.

Dave
 
Status
Not open for further replies.
Back
Top