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Arduino
From: Chris (CHRISSS)
25 Jan 2015 22:43
To: Chris (CHRISSS)
222 of 542
40898.222
In reply to
40898.221
Here's a pic
Attachments:
IMG_20150125_194753~02.jpg
From: ANT_THOMAS
25 Jan 2015 22:50
To: Chris (CHRISSS)
223 of 542
40898.223
In reply to
40898.222
Can you unplug the lights from the control box?
From: Chris (CHRISSS)
25 Jan 2015 22:52
To: ANT_THOMAS
224 of 542
40898.224
In reply to
40898.223
Yes. It has a 12V input, an IR sensor and a 4 pin output to control the LEDs.
From: koswix
26 Jan 2015 10:18
To: Chris (CHRISSS)
225 of 542
40898.225
In reply to
40898.222
Those pads look like they're meant to aid hear dissipation from the transistors.
From: Chris (CHRISSS)
26 Jan 2015 10:33
To: koswix
226 of 542
40898.226
In reply to
40898.225
I did wonder that but isn't the component supposed to sit in the white square? Looks like a bigger part could go there.
From: koswix
26 Jan 2015 10:50
To: Chris (CHRISSS)
227 of 542
40898.227
In reply to
40898.226
A bigger part *could* go there (as in, there's space for a bigger part) but that doesn't mean a bigger part *has* to go there.
It's pretty common when designing a PCB to tweak the design so that a range of different component packages can fit in, depending on what stock you have in/what's currently cheap to buy. Saves you redesigning the PCB every time you change supplier.
I'd still guess that those big pads are just to make for better heat dissipation.
From: koswix
26 Jan 2015 10:51
To: Chris (CHRISSS)
228 of 542
40898.228
In reply to
40898.226
This guy shows a few good examples of simple layout changes to make your boards more flexible:
http://www.robotroom.com/PCB-Layout-Tips.html
From: Chris (CHRISSS)
26 Jan 2015 11:16
To: koswix
229 of 542
40898.229
In reply to
40898.227
They should be able to handle 2A each (the sticker on the box says it's rated up to 6A) so they probably will generate a bit of heat so you're probably right.
Interesting site about the PCB design. I'll have another look at that later .
From: koswix
26 Jan 2015 11:44
To: Chris (CHRISSS)
230 of 542
40898.230
In reply to
40898.229
I only started looking into PCB design last week, never made one before. Want to design an interface board for my floppy organ to make it a bit neater.
From: ANT_THOMAS
26 Jan 2015 12:41
To: koswix
231 of 542
40898.231
In reply to
40898.228
I like that page, even if it's just because everything looks really neat and tidy.