| Electronics > Beginners |
| Soldered 0805 vs 0603 vs 0402 vs 0201 vs 01005 vs 008004 today :) |
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| ebastler:
--- Quote from: PixieDust on February 11, 2018, 02:00:49 am ---My problem is that I'm trying to cram the LEDs into a matrix. They are right next to one another and their pads are underneath. [...] the quantities of LEDs that I'm talking about ~4000. --- End quote --- Do you really need to build this from discrete LEDs? This sounds like a use case for a small OLED or TFT display. Have you checked whether something suitable is available off the shelf? I would be prepared to accept significant design changes to avoid such a large array of discrete components -- e.g. by adapting the aspect ratio or size, or switching to a higher-than needed number of pixels. Besides the need to make reliable electrical connections, won't you also have a requirement to align the LEDs quite precisely to make the arrangement look right when in operation? I assume this is some kind of display application. Depending on what content you want to display, the user's eye might be quite sensitive to small irregularities in LED spacing. |
| PixieDust:
The device I'm trying to make hasn't been made in decades and finding one is going to be next to impossible. At the moment, I can indeed use an OLED or TFT display, but I recently found some more information on it that prompted me to start researching doing this thing the hard way. It is a visual display device but it can be broken down into smaller bits. I want to start small and then build up. I don't need to make the whole thing in one go. I want to make a tiny matrix to see if it's technically possible then move onto making the whole thing of 4000 LEDs or whatever it is. I'm probably asking stupid questions, but you don't know until you know. Yep, the LEDs need to be placed precisely. But close enough should do since the surface tension of the reflow process should position them correctly according to my research. They made the original device somehow after all. |
| Howardlong:
More ultimate hand soldering dead bugging miniaturisation geekery, this time a blinky with the world's smallest ARM, in a 1.45mm x 1.55mm 16 ball 0.35mm pitch WLCSP Cypress CY8C4014FNI-421 Cortex M0. |
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