AlienTechnology
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Joined: Tue Jan 02, 2018 6:38 pm

Screen to fit in place of Decora light switch

Tue Jan 02, 2018 6:48 pm

Anyone know of a display - preferably touch - that could fit in place of a Decora switch?

Decora is very common in the US (http://www.leviton.com/en/solutions/brands/decora) and a display would make for a very finished look for home automation projects. The Pi could be in a separate case with a video cable going to the switch box.

The idea is that it would look something like this, but more flexible in what it can display:
Image

aBUGSworstnightmare
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Joined: Tue Jun 30, 2015 1:35 pm

Re: Screen to fit in place of Decora light switch

Wed Jan 03, 2018 6:20 am

What is the size of this switch or what is your target display size (resolution and or screen diagonal)? Sorry, but not everybody here is in the US, familiar with the local brands.

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saper_2
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Location: PL

Re: Screen to fit in place of Decora light switch

Wed Jan 03, 2018 10:22 pm

Here is some "wide" TFT displays, you can check the seller of those displays for something else...


https://www.aliexpress.com/store/produc ... 91945.html

https://www.aliexpress.com/store/produc ... 84455.html

https://www.aliexpress.com/store/produc ... 26952.html

NoTouch: https://www.aliexpress.com/store/produc ... 14089.html

Those links to Aliexpress might be down after few months, so here is the link to the seller: Store: Ecyberspaces

AlienTechnology
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Joined: Tue Jan 02, 2018 6:38 pm

Re: Screen to fit in place of Decora light switch

Mon Jan 08, 2018 8:35 pm

Here are the dimensions of the faceplate:

Image

Ideally, the Pi would be mounted elsewhere and with a video cable running to the box and display.

timrowledge
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Re: Screen to fit in place of Decora light switch

Tue Jan 09, 2018 7:47 pm

Not quite what the OP is asking for (no touch and somewhat small) but close enough that it might be interesting to some people - http://www.4dsystems.com.au/productpage ... _R_1_1.pdf
That has an ESP8266 included, which is a pretty good combination especially for US$20. They're very easy to integrate into a Pi environment - MQTT etc.

They do another model that is a bit too big at 78.4x44.8 and even a 95.7x57.1 version - but it does have touch
http://www.4dsystems.com.au/product/gen4_IoD/
Supposedly US$29

And they do a *round* one! How cool is that?
http://www.4dsystems.com.au/product/uLCD_220RD_PI/
Making Smalltalk on ARM since 1986; making your Scratch better since 2012

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saper_2
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Location: PL

Re: Screen to fit in place of Decora light switch

Tue Jan 09, 2018 8:51 pm

timrowledge wrote:
Tue Jan 09, 2018 7:47 pm
And they do a *round* one! How cool is that?
http://www.4dsystems.com.au/product/uLCD_220RD_PI/
Expensive like f.. hell ;) and the image quality won't be like on those photshop'ed photos :lol: :lol:

I found on aliexpress the display itself (1.38" round lcd module) but price is ......., also I found on alibaba manufacturer, and send inquiry for 2pcs to play with - I wonder how much he want for those.
AlienTechnology wrote:
Mon Jan 08, 2018 8:35 pm
Here are the dimensions of the faceplate:

Image

Ideally, the Pi would be mounted elsewhere and with a video cable running to the box and display.
You best shot for ready display would be to grab 3,2" 16:9 lcd panel and let some of it visible area get covered by bezel.
Here is one with dimensions drawing: https://www.aliexpress.com/store/produc ... 62038.html
Maybe there would be version with capacitive touch - which is better because if you even cover it by bezel, you don't have to worry that the bezel will press you the touch panel (which is very likely to happen with resistive touch panel).

As for control circuit - hook up to RPi0w via e.g. DPI or serial spi fbtft interface, or build custom control board with e.g. esp8266 or esp32 for IoT (MQTT ? or whatever is called )... If you're going to built it for yourself then Pi0w would be good option for display control, but for production better is custom-made-hardware (built even around esp8266 or esp32).
Attachments
HTB1lT0xkBTH8KJjy0Fiq6ARsXXak.jpg
3.2 inch TFT LCD Screen with Touch Panel - tech drawing - Aliexpress store: Ecyberspaces
HTB1lT0xkBTH8KJjy0Fiq6ARsXXak.jpg (64.3 KiB) Viewed 542 times

AlienTechnology
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Joined: Tue Jan 02, 2018 6:38 pm

Re: Screen to fit in place of Decora light switch

Mon Apr 16, 2018 5:19 pm

Thank you to everyone for your input. This was a one-off project so I wanted to use mostly off-the-shelf components.

I ended up using a Raspberry Pi Zero W and a PaPiRus ePaper display (https://www.adafruit.com/product/3335). A blank was routered out to make the bezel. The back cover is vacuum formed ABS. Total cost under $50 USD including the Pi.

Image Image

The display does not support touch and is not suitable for rapidly changing information, but works well for this purpose. The Pi is in the enclosure and the line is a 5vdc power line. The text on the display is updated via WiFi.

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