LED symbols in integrated circuit layouts I have assembled most of my first board. I have not added the LEDs. As I look carefully at the diagram on the board, it's unclear to me from the symbol on the board which way the LEDs go in. I do know LEDs are polar, so it matters which way round you insert them. Due to deficiencies in my personal manual dexterity, I'd like to avoid desoldering as much as possible. How do I tell beforehand which way I insert the LEDs? Is there a place on the larger site where I can find this kind of information? I've searched around a lot, and I can't find anything, either here or on Google or Wikipedia. https://reprap.org/forum/read.php?13,18496,18496#msg-18496 Mon, 16 Mar 2026 16:56:38 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?13,18496,18537#msg-18537 Re: LED symbols in integrated circuit layouts https://reprap.org/forum/read.php?13,18496,18537#msg-18537 single color leds are (hence the name.. diodes) therefor they will light up only in one direction,
leds with two colors have either three legs and are useless for your needs, or they have just two legs and you can solder them in as they come,
the only difference is, which color lights up in what direction.

you can use two leds as you mentioned, yes;
but it may be a good idea to have two sockets, to have them mounted properly ;)

'sid]]> sid Controllers Tue, 18 Nov 2008 03:23:13 -0500 https://reprap.org/forum/read.php?13,18496,18535#msg-18535 Re: LED symbols in integrated circuit layouts https://reprap.org/forum/read.php?13,18496,18535#msg-18535 > with the flat side (longer leg) of the LED and you're okay winking smiley

Sid: those leds are not bicolor? So two leds built into the same package.
So if using normal led, you can put in it in either way it will light up.

You should use two normal led inserting one in other direction, and this way will be a functional replacement of the original bicolor led.

Correct me, if Im wrong here.

Khiraly]]> khiraly Controllers Tue, 18 Nov 2008 01:35:15 -0500 https://reprap.org/forum/read.php?13,18496,18502#msg-18502 Re: LED symbols in integrated circuit layouts https://reprap.org/forum/read.php?13,18496,18502#msg-18502 John Stoner Controllers Sun, 16 Nov 2008 20:44:29 -0500 https://reprap.org/forum/read.php?13,18496,18499#msg-18499 Re: LED symbols in integrated circuit layouts https://reprap.org/forum/read.php?13,18496,18499#msg-18499

Theres a flat side on the silkscreen (pointing upwards), match that with the flat side (longer leg) of the LED and you're okay ;)

'sid
]]> sid Controllers Sun, 16 Nov 2008 19:38:54 -0500 https://reprap.org/forum/read.php?13,18496,18498#msg-18498 Re: LED symbols in integrated circuit layouts https://reprap.org/forum/read.php?13,18496,18498#msg-18498 John Stoner Controllers Sun, 16 Nov 2008 18:52:03 -0500 https://reprap.org/forum/read.php?13,18496,18497#msg-18497 Re: LED symbols in integrated circuit layouts https://reprap.org/forum/read.php?13,18496,18497#msg-18497 They often have a flat on the body beside the short/negative leg.
If you look into the side of the body, the legs get larger and close together, but the negative one is usually larger and cup shaped.]]> Lampbus Controllers Sun, 16 Nov 2008 18:26:06 -0500 https://reprap.org/forum/read.php?13,18496,18496#msg-18496 LED symbols in integrated circuit layouts https://reprap.org/forum/read.php?13,18496,18496#msg-18496
Is there a place on the larger site where I can find this kind of information? I've searched around a lot, and I can't find anything, either here or on Google or Wikipedia.]]> John Stoner Controllers Sun, 16 Nov 2008 18:22:39 -0500