Connect LED - what type of LED voltage

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Connect LED - what type of LED voltage

Postby rkoebrugge » Sun Sep 27, 2015 1:09 pm

I wanted to connect some LEDs to the OTGW and found the page at http://otgw.tclcode.com/peripherals.html.
This page says that PIN 1 is connected to VCC 5V. Does this mean that I need 5V LEDs? Because conrad.nl does not have any of these, most of them are around 12V or 24V.
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Re: Connect LED - what type of LED voltage

Postby marcelr » Sun Sep 27, 2015 7:35 pm

12-24V?

Last time I soldered LEDs to a PCB you needed resistors to squeeze the current coming from a 5V source (so as to have approximately 2V across the LED).
Maybe you should try these:

http://brigatti.nl/contents/nl/d1802.html

grtz,

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Re: Connect LED - what type of LED voltage

Postby hvxl » Tue Sep 29, 2015 9:59 pm

The web page you refer to assumes the use of very simple LEDs. Conrad has those in different colors, such as red, green, and yellow. You don't power these LEDs by putting a certain voltage on them, but by running a certain current through them. The resistor is used to control that current. So, the voltages mentioned by conrad are of little interest.

The LEDs marcelr points to have a built-in resistor. You would not connect those as described on the OTGW peripherals web page.
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