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  • Jul 29 20:06
    j9brown commented #141
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  • Jul 20 2021 18:55
    orgicus commented #132
Jamie Meredith
@jlmeredith
one thing I like about the arduino for the signs that I have lit lately is that running my configs without the FC and straight from an Arduino is much more reliable from a power on power off perspective - RP as you probably know have a huge issue with power loss - which means in addition to powering something installed for a long time PLUS providing a battery backup that shuts down the display in the event of a power failure becomes painful
Using the FASTLED libraries on an Ardiuno has become my goto for all small projects - the FC does excel for large scale projects - particularly the ingenious implementation of OPC and all of @scanlime goodness.
:)
This is my next toy to play with this - http://www.sandevices.com/E681info.html
Ordered it about a week ago
Much different foot print for sure - but has a lot of built in components that make doing large installs much easier it would seem - would be awesome to see where FC could be integrated into a project like this
buy this board - snap in a FC and away you go with all the ports and connections ready to roll
lol
Micah Elizabeth Scott
@scanlime
Neat, propeller CPU
weird to see an all-through-hole board nowadays
Jamie Meredith
@jlmeredith
They are sold mainly as kits
J. Grizzard
@elfchief
That's pretty nice looking.
Jamie Meredith
@jlmeredith
let me find the video where I learned about this
Guy that did dubstep christmas lights show
He has an amazing series of videos that explains every aspect of how all of this was built
well worth the watch - little dry but great video quality and great step by step instructions
I started investigating the 2801 pixels after I saw this and the controller that he is using
propeller CPU
opps
need to google that one @scanlime - I have not heard of it
Jamie Meredith
@jlmeredith
This is a short clip of the display about 8 days ago - I have since addressed a lot of the bad strips you see in the video and should have something more substantial to show in the next day or so
Jamie Meredith
@jlmeredith
Excellent resource on understanding the WS2812B LED - https://www.youtube.com/watch?v=EXr2_zSfnFw
Jamie Meredith
@jlmeredith
Question - Has anyone had luck finding a three wire quick connector for WS2811/12 strips? I see four wire connectors everywhere, but no three wire connectors
J. Grizzard
@elfchief
Jamie Meredith
@jlmeredith
@elfchief - No - like this - http://amzn.to/1Sucls5
Matthew Kessler
@M-I-Kessler
maybe those will help
3 pin jst sm
Daniel Garcia
@focalintent
No - the thing he's talking about are solder less clips that snap onto the ends of the strip.
J. Grizzard
@elfchief
I didn't even know those existed. But now I want them. In 3-pin flavor. Heh.
Jamie Meredith
@jlmeredith
@elfchief - I am thinking about getting some of the 4 pin versions and seeing if they will work
J. Grizzard
@elfchief
I'd think the spacing would be different. :(
Jamie Meredith
@jlmeredith
I have had nothing but problems trying to solder strips - I have found that putting a heat sink between the solder point and the led works most of the time to move the heat away from the LED
Daniel Garcia
@focalintent
Let me save you some time - the spacing is different
J. Grizzard
@elfchief
Wonder what you're doing different from me. I soldered a dozen strips last month with no special precautions and got a 0% failure rate.
Jamie Meredith
@jlmeredith
@elfchief - what temp do you solder at?
I pre-tin the contact points and then touch attach pre-tinned wires - I have never had issues with soldering most components - these have been tough - both the ones from Adafruit and the general ws2812 ones from Amazon
J. Grizzard
@elfchief
Y'know, I totally don't remember what temp I had it set to. But I can find out!
this is what I have been doing to avoid the overheating issue - I have been running the soldering iron at around 450
@focalintent - curious how you determined the spacing? Have you tried something like this?
J. Grizzard
@elfchief
Looks like... 370C. Also using leaded solder, which probably makes things go quicker.
Daniel Garcia
@focalintent
Yes - and the 4 wire clips don't line up on three wire strips.
Jamie Meredith
@jlmeredith
@elfchief - are you sure you did not mean 370F? That would be nearly 700F!
J. Grizzard
@elfchief
I'm sure! Given the lack of thermal mass that's probably a bit on the high side... probably like 340C would be better. But I'd rather have slightly too high than too low.
The quicker you can get in and out (within reason) the less time there is for heat to wander away from the joint and to your components. It takes me probably 2 seconds tops to solder a wire to one of the LED strips.
Micah Elizabeth Scott
@scanlime
I'll second the technique where you pre-tin both sides, then in one step merge the two to form the joint. It'll give you a strong joint if you're sure to hold the wires still while it cools, and if you're sure the heat penetrated both joints and there's still enough residual flux. Still takes some time though, and it'd be nice to have other options :)