Try the flexible ink screen

数码小叶

Try the flexible ink screen [Copy link]

 

I was lucky enough to win an e-ink screen in a live broadcast event on the forum. It was flexible, which was quite unexpected. When I got it, the screen was really as thin as paper The screen comes with an adapter board, which makes it much more convenient to connect to the MCU. Because I have never played with this kind of screen before, I have to study some information, and I haven't fully understood it yet. For example, the description in the information "When using the e-ink screen, it is recommended that the refresh interval be at least 180s, and refresh at least once every 24 hours. If the e-ink screen is not used for a long time, the e-ink screen should be refreshed and stored. " means that it should be refreshed every 3 minutes... It's not that bad. The screen parameter description is refreshed once every 2s. Ignore it for now, just click on the screen. First, use cubeMX to configure the basic code. The adapter board leads to the SPI interface , which greatly facilitates the operation. Choose NUCLEO-F103, because the built-in routine is also F1 series, which is faster to transplant. Open the SPI interface Configure the remaining four pins. The adapter board leads to 6 pins. Configure SPI parameters Then read the document "e-Paper displays Chinese characters", add the taken self-model to the program font library, compile through However, there is no response on the screen after burning it in. Then redirected the printf function, opened the serial port debugging assistant, and printed the error message. Continued to search and finally found that the problem was in the call of the malloc function. It kept failing to apply for space. It turned out that the heap size was too small. Modified the startup file, increased the heap size, and compiled and burned again. Finally saw the expected screen light up Arbitrary bending, really no effect It continues to display after power failure, no wonder it is super power-saving. The power consumption of refreshing the screen is 26.4mW, and it can reach <0.017mW when not refreshing

okhxyyo

Hahaha. Very interesting.

eric_wang

This is the biggest easter egg in the live broadcast

大秦正声

Good, how long can it last without power?

dcexpert

Daqin Zhengsheng published on 2019-4-19 10:48 Not bad, how long can it display without power?

There is no problem for a long time

littleshrimp

It's really a paper-like display

chenbingjy

Good, never played it

hujj

My baby, I've never played with a touch screen and I'm so envious.

freebsder

The ink screen has a refresh rate, so,,,, for such a long time, it is probably to ask you to try not to refresh it.

数码小叶

freebsder posted on 2019-4-19 20:21 The ink screen has a refresh rate, so,,, for such a long time, it is probably telling you to try not to refresh it

It makes sense

zhd

I wonder if there will be residual images if the display is on for a long time after a power outage???

star_66666

It's a good thing, but it's not very expensive. It's only a few dozen yuan on Taobao.

小生有礼

I learned a lot

yangjiaxu

Looks really cool. Awesome.

数码小叶

zhd posted on 2019-4-19 21:58 I wonder if there will be residual images if the display is on for a long time after a power outage? ? ?

I tested it for more than ten hours and it showed normally, but it was required to refresh at least once in 24 hours, so I didn’t test it for that long.

zhuyebb

Good, never played it

nmg

I asked someone at Weixue, and they said: "This refresh interval is mainly for models that cannot support local refresh. Because if the ink screen keeps working (powered on) for a long time, it will affect the refresh life of the ink screen." (That is to say, that time is the fastest, not the minimum refresh every 3 minutes)

数码小叶

nmg Posted on 2019-4-22 09:22 I asked someone from Weixue, and they said: "This refresh interval is mainly for models that cannot support local refresh. Because if the ink screen is powered on for a long time...

Thank you very much, but I still don't understand. I understand that it cannot be powered on for a long time after reading the information. "That is to say, that time is the fastest, not at least 3 minutes to refresh" To put it bluntly, the screen should be updated every 3 minutes, and should not be less than 3 minutes? Is this what you mean?

nmg

Digital Leaf published on 2019-4-22 12:53 Thank you very much, but I still don’t understand. I understand that it cannot be powered on for a long time after reading the information. “That is to say, that time is the fastest, not the minimum of 3...

No, if your application involves timed refresh, it should be refreshed every 3 minutes at most, don’t be shorter than this time

nmg

nmg Published on 2019-4-22 13:32 No, if your application involves timed refresh, it should be refreshed every 3 minutes at most. Don't refresh it any shorter than this

This refresh rate is for models that do not support partial refresh. Your model supports partial refresh, so I don't think you need to worry about it, haha