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IM120601001 20MM SQUARE 8*8 LED MATRIX - RED
IM120601001 20MM SQUARE 8x8 LED MATRIX - RED
US$4.13
This display has 64 Red LEDs packed into a 20mm x 20mm dot matrix display. Great for displaying text or creating bizarre lighting patterns.
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TCRT5000 REFLECTIVE OPTICAL SENSOR
TCRT5000 REFLECTIVE OPTICAL SENSOR
US$1.39

This has a compact construction where the emitting-light source and the detector are arranged in the same direction to sense the presence of an object by using the reflective IR beam from the object.

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DFR0287 LCD12864 Shield for Arduino
DFR0287 LCD12864 Shield for Arduino
US$41.93

This is compatible with most of Arduino controllers and supports English/Chinese/Picture display. With 5 analog extention pins and 8 digital pins, the LCD12864 Shield also integrates a 5-key joystick for controlling addtional functions, making it an ideal module for prototyping and interactive projects. 

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COM-12704 LED - Purple 5mm
COM-12704 LED - Purple 5mm
US$0.91
This is a very basic 5mm purple LED. It has a typical forward voltage of 3.4V and a rated forward current of 30mA.
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1643-ADA NeoPixel Ring - 12 x WS2812 5050 RGB LED with Integrated Drivers
1643-ADA NeoPixel Ring - 12 x WS2812 5050 RGB LED with Integrated Drivers
US$13.13
12 ultra bright smart LED NeoPixels are arranged in a circle with 1.5" (37mm) outer diameter. The rings are 'chainable' - connect the output pin of one to the input pin of another.
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COM-12664 NeoPixel Ring - 16 x WS2812 5050 RGB LED
COM-12664 NeoPixel Ring - 16 x WS2812 5050 RGB LED
US$18.32
This is a small chainable 1.75" (44.5mm) outer diameter board equipped with 5050 WS2812 RGB LEDs. The WS2812s are each addressable as the driver chip is located inside the LED. Each NeoPixel Stick has ~18mA constant current drive so the color will be very consistent even if the voltage varies, and requires 5V.
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306-ADA Digital RGB LED Weatherproof Strip 32 LED - (1m)
306-ADA Digital RGB LED Weatherproof Strip 32 LED - (1m)
US$52.42
There are 32 RGB LEDs per meter, and you can control each LED individually! Yes, that's right, this is the digitally-addressable type of LED strip. You can set the color of each LED's red, green and blue component with 7-bit PWM precision (so 21-bit color per pixel). The LEDs are controlled by shift-registers that are chained up down the strip so you can shorten or lengthen the strip.
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1270-ADA Adafruit 1.2" 4-Digit 7-Segment Display w/I2C Backpack - Red
1270-ADA Adafruit 1.2" 4-Digit 7-Segment Display w/I2C Backpack - Red
US$26.95

The product kit comes with: A fully tested and assembled LED backpack. Ultra-bright 4-digit 1.2" tall red seven-segment display. 5-pin header. A bit of soldering is required to attach the matrix onto the backpack but its very easy to do and only takes about 5 minutes. 

Delivery within 2-3 weeks
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1399-ADA RGB 7-Segment Digit - 1" Tall Digit
1399-ADA RGB 7-Segment Digit - 1" Tall Digit
US$27.92
Inside each segment is 3 red/green/blue LEDs, for 21 LEDs total. The anodes are all connected together and then there are 21 cathodes to control. 
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1612-ADA NeoPixel Mini PCB - Pack of 5
1612-ADA NeoPixel Mini PCB - Pack of 5
US$8.67
These little PCBs are only 8mm x 10mm and have two sets of three pads on the back for soldering wires.
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1621-ADA White LED Backlight Module - Large 45mm x 86mm
1621-ADA White LED Backlight Module - Large 45mm x 86mm
US$5.17
Each LED is encased in a 3.5mm thick strip of a acrylic.
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COM-12062 LED - Assorted (20 pack)
COM-12062 LED - Assorted (20 pack)
US$5.69
This is a pack of basic red, yellow, blue and green 5mm LEDs (5 of each) all conveniently packaged in a nice reusable ESD safe bag.
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PRT-12622 SMD LED - Green 1206 (strip of 25)
PRT-12622 SMD LED - Green 1206 (strip of 25)
US$8.19
Each pack includes 25 tiny green 1206 SMD LEDs in cut-tape packaging. These are great for status lights or for building really small LED matrices.
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PRT-12621 SMD LED - White 1206 (strip of 25)
PRT-12621 SMD LED - White 1206 (strip of 25)
US$8.78
Each pack includes 25 tiny white 1206 SMD LEDs in cut-tape packaging. These are great for status lights or for building really small LED matrices. 
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PRT-12620 SMD LED - Blue 1206 (strip of 25)
PRT-12620 SMD LED - Blue 1206 (strip of 25)
US$6.93
Eeach pack includes 25 tiny blue 1206 SMD LEDs in cut-tape packaging. These are great for status lights or for building really small LED matrices.
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74 - 88