New Jarduino build gets started

[daplatapus]

Originally Posted by KrazyKuch

I didnt see if anyone told what you did wrong here and I know your past that but for future reference for anybody else it looks like those 2 original resistors were in parallel and by putting in a jumper you basically jumpered out your variable resistor....ie you removed the resistance from the circuit, hence the smoke!!!

Lol, I actually ended up pulling everything off the board and traced everything back to see how that thing was made.
I basically created a dead short like you said. Education is never free

[daplatapus]

2 ends down, 10 to go... them is a lot of wires in one little fitting...ugh

[daplatapus]

A soldering we shall go, a soldering we shall go...
It's become my new habit over my morning coffee... I can think of funner ones

[daplatapus]

Ok, I got one fixture almost done. Just the fan and sensor circuit to figure out. I think I'm going to run a separate 3 wire just for the fan circuit to solve my wire shortage problem. Which will be much easier to fix if I ever have a fan fail. All I'll have to do is yank the fan off the heatsink and replace rather than have to pull the whole fixture to repair it. So here's the amphenol connector all soldered up:



And how it looks like once it's mounted to the heatsink:


I'm fairly happy with the final look of it.
And how it looks like from the back:



And the top with the fan and everything. The random wires still not connected are the fan PWM wires and the 3 sensor wires.



And a final shot with the actual DIY cable I made up hook in:



A couple quick questions for anyone who's done something similar:
How did you mount your temp sensor on the heatsink and where did you mount it? Directly above one of the LED stars?

[mike31154]

I guess I'm too late with this advice, but on connectors with that many pins packed tightly together, it's often a good idea to have a piece of heatshrink on the wire before soldering. Once the pin is soldered up, slide the heatshrink down over the pin & shrink. This minimizes the chance of pins shorting together via a strand of wire or blob of solder. You did a fine job with the soldering so shorts are unlikely once things are buttoned up, but adding the heatshrink was a requirement for the work I used to do. It was great to work on the newer equipment with crimp pins that were pushed into the connector after assembly. With the proper insertion/extraction tools, these connectors were a pleasure to work on, but I wouldn't want to pay for that stuff out of my pocket.

[Chatouille]

For the temp sensor, I just drilled a partial depth hole in the heatsink, and used Arctic Silver thermal epoxy to secure it in the hole. My hope is that it will get a more accurate temp of the heatsink without being affected by the fan.

Yeah the crimp ring type with the extraction/insertion tool are really nice to work with, makes changing out a bent/broken pins a breeze. Would hate to pull apart a 30+ pin solder type connector just to change out a damaged pin.

[daplatapus]

Originally Posted by mike31154

I guess I'm too late with this advice, but on connectors with that many pins packed tightly together, it's often a good idea to have a piece of heatshrink on the wire before soldering.

Ya ,I actually thought of that after I'd finished the first one. But what I was able to do was heat the pin up just a hair and stretch the wire insulation down over the pin. It worked really well and once the pin cooled the insulation stayed put.

I did have a buddy of mine that has the amphenol crimper and everything to do it, but these pins are meant to be soldered. The wire actually slides about 1/16" or so into the pins in a little pocket. Then one it's soldered there's nothing ever going to pull these out. It tedious work to be sure, especially those middle pins, but it works well.
And ya, I didn't want to spend the dough on the real amphenol connectors either

Originally Posted by Chatouille

For the temp sensor, I just drilled a partial depth hole in the heatsink, and used Arctic Silver thermal epoxy to secure it in the hole. My hope is that it will get a more accurate temp of the heatsink without being affected by the fan.

Yeah, I was worried the fan would affect the sensor. With all the fins on the back of this heatsink it'll just direct all the air right by the sensor. I like the idea of half drilling through the aluminum and setting in with that thermal epoxy. Did you worry about how close you were to an actual LED location?

Thanks for the feed back!