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*Part of 7 segment display
 
*Part of 7 segment display
 
*Light source
 
*Light source
* sensor -- the [[multi-touch display#bidirectional LEDs]] article section describes how to use LEDs as a crude light sensor.
 
  
 
Links
 
Links
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* [http://www.sureelectronics.net/goods.php?id=142 2416 Dot Matrix Red Display information Board] 24 by 16 led for about 12 bucks.
 
* [http://www.sureelectronics.net/goods.php?id=142 2416 Dot Matrix Red Display information Board] 24 by 16 led for about 12 bucks.
 
* [[PointLess LED Array]]
 
* [[PointLess LED Array]]
* Some [[multi-touch display]]s use LED arrays
 
 
* [http://www.seeedstudio.com/wiki/index.php?title=64_LED_Button_Pad 64 LED Button Pad] 8x8 array of RGB-LED-lit buttons, plus PWM drivers, designed to be driven by an Arduino-compatible board ... such as the [http://www.seeedstudio.com/wiki/index.php?title=8x8_RGB_LED_Matrix_Driver 8x8 RGB LED Matrix driver]
 
* [http://www.seeedstudio.com/wiki/index.php?title=64_LED_Button_Pad 64 LED Button Pad] 8x8 array of RGB-LED-lit buttons, plus PWM drivers, designed to be driven by an Arduino-compatible board ... such as the [http://www.seeedstudio.com/wiki/index.php?title=8x8_RGB_LED_Matrix_Driver 8x8 RGB LED Matrix driver]
 
* [http://www.seeedstudio.com/wiki/index.php?title=RGB_LED_Shield 4x4 RGB LED Shield] Arduino shield
 
* [http://www.seeedstudio.com/wiki/index.php?title=RGB_LED_Shield 4x4 RGB LED Shield] Arduino shield
 
* [http://www.mignonette-game.com/ Mignonette game kit] 5x7 bi-color LED matrix and ATMega88 processor [http://www.makershed.com/ProductDetails.asp?ProductCode=MKCE5]
 
* [http://www.mignonette-game.com/ Mignonette game kit] 5x7 bi-color LED matrix and ATMega88 processor [http://www.makershed.com/ProductDetails.asp?ProductCode=MKCE5]
* [http://evilmadscience.com/tinykitlist/100-meggyjr Meggy Jr RGB LED Matrix Game Development Kit]
+
* [http://evilmadscience.com/tinykitlist/100-meggyjr Meggy Jr RGB
 +
LED Matrix Game Development Kit ]
  
 
== LCDs ==
 
== LCDs ==
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* [[Topway LCD]] - supplier from Shenzhen, Mainland China
 
* [[Topway LCD]] - supplier from Shenzhen, Mainland China
 
* [http://store.gravitech.us/lcds.html http://store.gravitech.us/lcds.html]
 
* [http://store.gravitech.us/lcds.html http://store.gravitech.us/lcds.html]
* [[TVI Electronics]]
 
 
LCDs are extremely commonly used as a [[Microcontroller User Interfaces]].
 
In particular, [[watch display]]s are small displays suitable for [[Open Source Watch]]es -- most of them are LCD displays.
 
  
 
== Photo Diode ==
 
== Photo Diode ==

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