Don’t use 7-segment displays (2011) [pdf]

Re:Don’t use 7-segment displays (2011) [pdf] by tyingq on Sunday March 07, 2021 @02:06PM (#26378707)

I wasn't suggesting one of them would settle the matter. I was suggesting it would be cheaper to use them instead. They are made to be grouped together, and daisy chained to a single controller.

I believe each module would be 160 x 120 dots (19,200 dots total) though, based on module size and LED pitch. I'm unclear on where you got 104x78.

[ Parent | on HN ]

Re:Don’t use 7-segment displays (2011) [pdf] by tal8d on Sunday March 07, 2021 @03:52PM (#26379653)

> I'm unclear on where you got 104x78.

https://www.alibaba.com/product-detail/Hot-sale-small-pitch-...

    Module  Res     Size
    P1.923  104*78  200*150

I went ahead and counted... 128x96 (12,288 LEDs)

https://imgur.com/a/4qdY1Pr

[ Parent | on HN ]

Re:Don’t use 7-segment displays (2011) [pdf] by tyingq on Sunday March 07, 2021 @05:03PM (#26380213)

It's just bad pictures and errant info.

Here's a better link: https://www.aliexpress.com/item/32965783207.html

It's 160x120, as I mentioned for a 200x150mm P1.25 led module. You just divide the width/height by the pitch to see the number of dots.

As far as I can tell, 1.25mm is the smallest pitch available for these modules.

[ Parent | on HN ]

Re:Don’t use 7-segment displays (2011) [pdf] by tal8d on Sunday March 07, 2021 @07:23PM (#26381109)

lol, I marked every tenth led manually and counted twice - the number is correct, the marketplace is wrong.

https://imgur.com/a/NqVXtDd

https://www.mblock.com.tw/upload/Investor/events/2020/202008...

[ Parent | on HN ]

Re:Don’t use 7-segment displays (2011) [pdf] by tyingq on Sunday March 07, 2021 @07:44PM (#26381221)

You counted dots on a picture of something other than a "200mmx150mm P1.25 led module". Pitch is the distance between the center of each LED.

1.25mm x 160 = 200mm

1.25mm x 120 = 150mm

[ Parent | on HN ]