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Topic: Breadboard helper LED board (Read 1 time) previous topic - next topic

larryd

Dec 11, 2016, 08:52 pm Last Edit: Dec 11, 2016, 08:58 pm by LarryD
I plan on making some of these helper PCBs to speed up circuit connections when testing on breadboards.
Any suggestions on this simple design?
I plan on making both common Cathode and Anode versions.



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outsider

#1
Dec 11, 2016, 10:19 pm Last Edit: Dec 11, 2016, 10:20 pm by outsider
How about a DPDT slide sw on each channel to switch from Hi to LO true?

larryd

Thanks.

Trying to keep things small and pluggable into a bread board.
Having both common anode/cathode 'boards' let's the coder use HIGH or LOW logic turn on a led.


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The last thing you did is where you should start looking.

outsider

#3
Dec 11, 2016, 11:46 pm Last Edit: Dec 11, 2016, 11:47 pm by outsider
Another thought, if you use the newer "high brightness" LEDs you might get away with only 1 or 2 Ma per channel, I've got some blue and white ones that are plenty bright enough (IMHO) with a 2k2 R at 5V.

larryd

Yes, some of those SMD LEDs are very bright  :smiley-eek: and with larger dropping resistors you can keep current draw down to a minimum.
Will have to select appropriate resistor values as Vf is different for different colors. R/GN/BE/GN

Going to make a few of these boards in about an hour, I'll take a picture and show how they turned out.


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larryd

#5
Dec 12, 2016, 04:10 am Last Edit: Dec 12, 2016, 04:15 am by LarryD
Turned out well.

Yellow used a  1K series resistor.
Blue used a    2.2K series resistor.
Green used a   430R series resistor.
Red used  a    1K series resistor.






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No technical PMs.
The last thing you did is where you should start looking.

larryd

#6
Dec 14, 2016, 03:15 am Last Edit: Dec 14, 2016, 03:25 am by LarryD
If there are DIYers out there, here is a 1:1 PDF of the 8 LED version.
PDF Attached





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tinman13kup

What size are the leds and resistors? 0603?
Tom
It's not a hobby if you're not having fun doing it. Step back and breathe

larryd

#8
Dec 14, 2016, 03:27 am Last Edit: Dec 14, 2016, 03:38 am by LarryD
Size is 1206

Yellow  1K
Blue    2.2K
Green  430 ohm
Red   1K
White 4.7K
No technical PMs.
The last thing you did is where you should start looking.

larryd

#9
Dec 14, 2016, 03:36 am Last Edit: Dec 14, 2016, 03:37 am by LarryD
10 LED version


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The last thing you did is where you should start looking.

tinman13kup

Size is 1206

Yellow  1K
Blue    2.2K
Green  430 ohm
Red   1K
White 4.7K

Nuts. All I have are 0603 and 0402's.

Still, I'm going to download and perhaps on my next digikey order I'll go nuts with 1206 resistors.
Tom
It's not a hobby if you're not having fun doing it. Step back and breathe

larryd

BTW, I use a flush cut bit in a router to trim to the board outline.
See:
http://forum.arduino.cc/index.php?topic=349610.0

No technical PMs.
The last thing you did is where you should start looking.

larryd

#12
Dec 14, 2016, 05:24 am Last Edit: Dec 14, 2016, 05:42 am by LarryD
Decided to remove the left hand machine pin and use a header wire instead.
This way there would be less chance in shorting an output pin to the common lead.






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larryd

#13
Dec 14, 2016, 05:42 am Last Edit: Dec 14, 2016, 08:59 am by LarryD
I made a harness to quickly connect the Arduino to the '10 LED breadboard helper card'.




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larryd

No technical PMs.
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