bibelo
Posts: 8
Joined: Thu Dec 14, 2017 8:46 am

Re: big e-ink display, 7-inch or more

Thu Dec 14, 2017 8:56 am

RaTTuS wrote:
Fri Sep 29, 2017 7:22 am
https://waveshare.aliexpress.com/store/ ... 4330P4JY15 this is the waveshare home on aliexpress for those who need to know
Thanks a lot, I bought this display and managed to make it work with the provided Python sample code, with the right cabling and libraries. It's quite simple to do (I did it), just requires patience.

I also managed to import and display my Google Keep Notes using a library provided online.

Now I'd like to actually display, not only one note, but many (4 to 8), so I would need 4 to 8 screens, but I will start with 2 only for the sake of testing.

So I've got a question: how can you multiplex many screens like that on the GPIO? I've seen SPI multiplexing is possible. Is it only that, or other info I'd need?

Here's the cabling :

VCC 3.3V
GND GND
DIN SPI MOSI
CLK SPI SCK
CS SPI chip select (Low active)
DC Data/Command control pin (High for data, and low for command)
RST External reset pin (Low for reset)
BUSY Busy state output pin (Low for busy)

https://www.waveshare.com/wiki/4.2inch_e-Paper_Module

Thank you guys again a lot. I remember I checked this thread few years ago, and there was no solution yet. And now I'm actually able to do it as I originally planned. Is it not great? :-)

denzilferreira
Posts: 1
Joined: Sun Mar 04, 2018 8:46 am

Re: big e-ink display, 7-inch or more

Sun Mar 04, 2018 8:52 am

I got recently the 3-color 7.5 inch epaper from waveshare and I can't get even the demo to work. I've activated serial, i2c and gpio on the raspi-config, compiled the libraries. I'm using the hat on top of the pi3 so this should work but nothing happens when I executed the python sample... Any ideas on where to start to debug this? The screen seems fine, no damage or anything as far as I can see.

xavik
Posts: 1
Joined: Tue Jun 12, 2018 9:37 am

Re: big e-ink display, 7-inch or more

Tue Jun 12, 2018 9:41 am

What about using one of these? :

https://es.aliexpress.com/item/Amazon-k ... 81990.html

It's only 48$ and it would be easy to do.

dfic
Posts: 2
Joined: Sun Jun 17, 2018 12:01 am

Re: big e-ink display, 7-inch or more

Mon Jun 18, 2018 10:39 am

xavik wrote:
Tue Jun 12, 2018 9:41 am
What about using one of these? :

https://es.aliexpress.com/item/Amazon-k ... 81990.html

It's only 48$ and it would be easy to do.
How do you mean easy? Only thing I could find is that it cannot be done ( https://raspberrypi.stackexchange.com/q ... ent-screen )

Can you explain how to do it?

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