Light-emitting diode - Revision history

104.224.188.248: /* light pipe */

2022-05-19T07:11:26Z

light pipe

104.224.188.248: /* light pipe */

2022-05-19T07:10:00Z

light pipe

DavidCary: mention LED light pipes

2016-03-19T18:59:25Z

mention LED light pipes

142.165.8.16: /* 5.0v - 3.3V voltage drop via red LED */

2012-10-16T21:43:57Z

5.0v - 3.3V voltage drop via red LED

142.165.8.16: /* throwies */

2012-10-16T21:42:03Z

throwies

142.165.8.16 at 21:41, 16 October 2012

2012-10-16T21:41:04Z

DavidCary: "What are the relevant parameters for a reverse-biased LED light sensor?"

2011-10-05T05:42:41Z

"What are the relevant parameters for a reverse-biased LED light sensor?"

DavidCary: wiki that discuss "throwies"

2009-05-22T03:57:31Z

wiki that discuss "throwies"

DavidCary: link to other Open Circuits pages

2008-07-27T02:25:07Z

link to other Open Circuits pages

DavidCary: LEDs used "in reverse": as light sensors (moved from sensors)

2008-07-27T01:22:45Z

LEDs used "in reverse": as light sensors (moved from sensors)

@@ Line 40: / Line 40: @@
 * "Build Your Own Light Pipe" [http://labs.ideo.com/2015/07/28/build-your-own-light-pipe/]
 * "3D printed light pipes" [http://www.disneyresearch.com/project/printed-optics/]
-* "Care222 LED Lamp " [http://www.faruvclite.co/]
+* "Care222 LED Lamp " [http://www.faruvclite.com/]
 * "3D Printing Light Pipes" [https://www.fictiv.com/resources/starter/prototyping-with-light-pipes]
 * "Using t-glase for Light-Pipes" [http://taulman3d.com/t-glase-features.html]

@@ Line 40: / Line 40: @@
 * "Build Your Own Light Pipe" [http://labs.ideo.com/2015/07/28/build-your-own-light-pipe/]
 * "3D printed light pipes" [http://www.disneyresearch.com/project/printed-optics/]
 * "3D Printing Light Pipes" [https://www.fictiv.com/resources/starter/prototyping-with-light-pipes]
 * "Using t-glase for Light-Pipes" [http://taulman3d.com/t-glase-features.html]

← Older revision		Revision as of 18:59, 19 March 2016
Line 27:		Line 27:

	A few people use LEDs in an unusual way: as [[sensors]].		A few people use LEDs in an unusual way: as [[sensors]].
		+
		+	== light pipe ==
		+
		+	Many people want and blinking/glowing spot here, controlled by a nearby circuit board there.
		+	One approach is to put a LED directly on the circuit board there,
		+	and guide the light from that LED to here using a light pipe.
		+
		+	Some commercial off-the-shelf light pipes; and some tips on building custom light pipes from transparent acrylic, aluminum foil, or 3D printed materials:
		+
		+	* "LED light pipes" [http://www.mouser.com/Optoelectronics/LED-Indication/LED-Light-Pipes/_/N-b1d20]
		+	* "LED light pipes" [http://www.digikey.com/product-search/en/optoelectronics/optics-leds-light-pipes]
		+	* "Build Your Own Light Pipe" [http://labs.ideo.com/2015/07/28/build-your-own-light-pipe/]
		+	* "3D printed light pipes" [http://www.disneyresearch.com/project/printed-optics/]
		+	* "3D Printing Light Pipes" [https://www.fictiv.com/resources/starter/prototyping-with-light-pipes]
		+	* "Using t-glase for Light-Pipes" [http://taulman3d.com/t-glase-features.html]
		+	* "Light Guide Techniques" [http://www.avagotech.com/docs/5988-7057EN]
		+	* "Optical light pipes" [http://www.dialight.com/Product/Category/Lightpipes_Optopipe]
		+	* "Light Pipe Selector Guide" [http://www.dialight.com/Assets%5CBrochures_And_Catalogs%5CIndication%5CLightpipe_Selector_Guide.pdf]
		+	* "LED light pipes" [http://www.bivar.com/led-indication/light-pipes]

	== 5.0v - 3.3V voltage drop via red LED ==		== 5.0v - 3.3V voltage drop via red LED ==

@@ Line 30: / Line 30: @@
 == 5.0v - 3.3V voltage drop via red LED ==
-The average red LED has a 1.7V voltage drop.  This property can be (ab)used to power very small 3.3V IC's from a 5.0V power supply -- put the LED in series with the 5V line.
+The average red LED has a 1.7V voltage drop.  This property can be (ab)used to power very small 3.3V IC's from a 5.0V power supply -- put the LED in series with the 5V line.  There probably won't be enough power used to light the LED properly, but this does not matter for the voltage drop property.
 == further reading ==

@@ Line 18: / Line 18: @@
 == throwies ==
-Several other wiki discuss how to turn LEDs into "throwies":
+Several other wiki discuss how to turn LEDs into "throwies"(little blinking LED devices that attach to outdoor structures via magnets):
 * [http://c2.com/cybords/wiki.cgi?ThrowieTalkie Cybords wiki: Throwie Talkie]: A Talkie is a Throwie that has been hacked to blink graffiti messages in Morse code.

← Older revision		Revision as of 21:41, 16 October 2012
Line 28:		Line 28:
	A few people use LEDs in an unusual way: as [[sensors]].		A few people use LEDs in an unusual way: as [[sensors]].

		+	== 5.0v - 3.3V voltage drop via red LED ==
		+
		+	The average red LED has a 1.7V voltage drop. This property can be (ab)used to power very small 3.3V IC's from a 5.0V power supply -- put the LED in series with the 5V line.

	== further reading ==		== further reading ==

← Older revision		Revision as of 05:42, 5 October 2011
Line 40:		Line 40:
	*[http://www.robotroom.com/ReversedLED.html Making an Amplified Color Sensor from an LED and an Op Amp]		*[http://www.robotroom.com/ReversedLED.html Making an Amplified Color Sensor from an LED and an Op Amp]
	* [http://www.redrok.com/electron.htm#led1 LED1 LED Sensor Relay Tracker Schematic]		* [http://www.redrok.com/electron.htm#led1 LED1 LED Sensor Relay Tracker Schematic]
		+	* [http://electronics.stackexchange.com/questions/19051/what-are-the-relevant-parameters-for-a-reverse-biased-led-light-sensor "What are the relevant parameters for a reverse-biased LED light sensor?"]

← Older revision		Revision as of 03:57, 22 May 2009
Line 15:		Line 15:

	[[POV display]]		[[POV display]]
		+
		+	== throwies ==
		+
		+	Several other wiki discuss how to turn LEDs into "throwies":
		+
		+	* [http://c2.com/cybords/wiki.cgi?ThrowieTalkie Cybords wiki: Throwie Talkie]: A Talkie is a Throwie that has been hacked to blink graffiti messages in Morse code.
		+	* [http://wiki.tagrecord.com/Throwies TagRecord.com Wiki: Led throwies]
		+	* [http://wiki.feedle.net/index.php?title=Throwies the mayowiki: Throwies]

	== sensor ==		== sensor ==

@@ Line 1: / Line 1: @@
-Light emitting diode
+A '''light emitting diode''' is the most popular kind of [[optoelectronics]].
 To make the LED light up, you need a power supply (any voltage) and a resistor.
@@ Line 11: / Line 11: @@
 You then connect a 190 ohm resistance in series with the LED to make it work.
 == sensor ==

@@ Line 1: / Line 1: @@
-Light emitting diode:
+Light emitting diode
 The resistance required is as follows:
 R = (U_power - U_led) / I_max
-Example a LED with voltage drop of Uled=1.2V and a max current of I_max=0,020A (20mA) to be powered by a 5V DC source needs:
+Example: a LED with voltage drop of Uled=1.2V and a max current of I_max=0,020A (20mA) to be powered by a 5V DC source needs:
 R = (5-1.2)/.02 = 190 ohm
@@ Line 10: / Line 12: @@
 You then connect a 190 ohm resistance in series with the LED to make it work.
-http://en.wikipedia.org/wiki/LED<br>
+*[http://www.ladyada.net/forums/viewtopic.php?p=22251  Hack a MiniPOV3 for IR capture]