t0mpr1c3 91 Posted January 16, 2014 Share Posted January 16, 2014 @@greeeg Very, very nice project. @@t0mpr1c3 count with me for a group buy! OK, I've started a thread for a group buy. The discount per LED will not be huge, the main advantage will be that we can get multiples of 125 LEDs instead of each buying 2x 100 LEDs and having loads of spares. Quote Link to post Share on other sites
t0mpr1c3 91 Posted January 16, 2014 Share Posted January 16, 2014 Nice project! Been thinking about something similar myself. One tip regarding the LED's: the newer WS2812B has only 4 instead of 6 pins which means 240 less solder poinst for this clock. Other improvements (according to this post) simpler layout helps prevent shorts improved voltage drop improved thermal dissipation higher brightness I've found these in lots of 200 at AliExpress for $30 plus $20 shipping. Excellent - better LEDs for the same money, and less soldering. @@greeeg any chance you could post the design files so someone could have a go at changing the footprint? Quote Link to post Share on other sites
abecedarian 330 Posted January 16, 2014 Share Posted January 16, 2014 This would be really sweet as an 'infinity mirror', but not sure how the boards would work. Love it though! Quote Link to post Share on other sites
t0mpr1c3 91 Posted January 16, 2014 Share Posted January 16, 2014 This would be really sweet as an 'infinity mirror', but not sure how the boards would work. Love it though! I think that would be easiest done with 2 * addressable LED strips, which conveniently come in lengths of 60. The effect would be very cool. The diameter would be ~32cm which is pretty manageable. Quote Link to post Share on other sites
t0mpr1c3 91 Posted January 17, 2014 Share Posted January 17, 2014 Last call for the LED group buy! Quote Link to post Share on other sites
jrychter 14 Posted January 17, 2014 Share Posted January 17, 2014 This is such a great idea. I've been writing code to interface with the WS2812 chips (and finally managed to get a 100% working solution using DMA and a timer, although not on a MSP430), but I never thought of producing PCBs that are segments of a circle. Very clever! I am so going to rip this idea off! Oh, wait, I think it is called "being inspired by". Or, if you're Samsung "discovered independently while innovating" :-) Thanks for sharing! Quote Link to post Share on other sites
greeeg 460 Posted January 17, 2014 Author Share Posted January 17, 2014 @@jrychter The WS2812 is a fantastic IC. DMA sounds like such a luxury. I've been working on some code to drive these for the valueline MSP430's, unfortuantely only the higher end MSP's have a DMA Yeah go ahead. I've released the updated PCB's under OSHW. I'd like to see what you come up with Edit: mis-post added text. jrychter 1 Quote Link to post Share on other sites
greeeg 460 Posted January 17, 2014 Author Share Posted January 17, 2014 Here is an updated PCB. 100% compatible with the old one. However this one features the new WS2812B footprint. Here is the Altium project files. Includes gerbers and schematics. ledRing_2.zip Edit: As per @RobG's suggestion this is a moddified version to fit onto a 5cmx10cm PCB. only 5 of these are required to make a full circle. This is an un-proven design, however it was created by placing 2 of the smaller segments together in altium. So it should be good. ledRing_2_5x10.zip bluehash, t0mpr1c3, cubeberg and 1 other 4 Quote Link to post Share on other sites
greeeg 460 Posted January 18, 2014 Author Share Posted January 18, 2014 New version 2_01!! This is just the double (5x10cm) board. but I have rounded the sharp edge so that it will match up with the inner corner (which will be rounded due to router bit) Project files ledRing_2_01_5x10.zip xxx1 and t0mpr1c3 2 Quote Link to post Share on other sites
jrychter 14 Posted January 18, 2014 Share Posted January 18, 2014 The WS2812 is a fantastic IC. DMA sounds like such a luxury. I've been working on some code to drive these for the valueline MSP430's, unfortuantely only the higher end MSP's have a DMA Yeah go ahead. I've released the updated PCB's under OSHW. I'd like to see what you come up with I agree the WS2812 is a fantastic IC, but the documentation is really crappy. This is something I can't understand about Chinese companies (it isn't the first time I see something like this): the company makes millions of chips, but can't spare a week to write a decent datasheet? For those that do not know, there are at least three versions of the datasheet in question. Each version has different timings. In none of the versions I have do the timings add up correctly. The Quote Link to post Share on other sites
cubeberg 540 Posted January 18, 2014 Share Posted January 18, 2014 You mentioned something to drive the ring - maybe a separate small board with a DS3231, spot for a 2553 and an LDO for 3.6v? Or do you need a bigger proc like the 5529? Quote Link to post Share on other sites
t0mpr1c3 91 Posted January 18, 2014 Share Posted January 18, 2014 Is 3.6V OK to drive the SPI? Might need a level shifter. I was planning on trying to put a GPS module in mine, because I got one in the Radio Shack sale and it's just sitting there. F5529 has DMA. Quote Link to post Share on other sites
xxx1 35 Posted January 18, 2014 Share Posted January 18, 2014 @@t0mpr1c3 We could use the TXB0104 from Texas Instruments. I vote for the F5529 if were possible. Quote Link to post Share on other sites
RobG 1,892 Posted January 18, 2014 Share Posted January 18, 2014 I would suggest to put the driver on a separate board. Quote Link to post Share on other sites
t0mpr1c3 91 Posted January 18, 2014 Share Posted January 18, 2014 What kind of power supply is necessary for 120 pixels Rob? Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.