Adafruit

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US$5.17
This power jack is designed to easily attach to a panel up to 8mm thick (0.315" or 5/16") and fit 2.1mm power plugs snugly and securely. Perfect for adding a power connector to your project enclosure.
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US$17.42
This provides 12-bit precision at 3300 samples/second over I2C. The chip can be configured as 4 single-ended input channels, or two differential channels.
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US$8.67
This breakout PCB set will make your life much much easier and get you prototyping faster than ever. One side has a 14-TSSOP pin out with traces going to two rows of 0.1" spaced holes, the other has 14-SOIC. Solder your chip to either side and you're ready to rock on any solderless breadboard.
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US$87.42

Build your own ambient-light addition for a monitor or media PC television with the Adalight project pack!. By running the Processing code on your computer, the halo of LEDs will follow the screen colors to provide an awesome ambient light display that adds pop to TV shows, movies or games! Works using open source Processing and Arduino - so it'll run on Mac, Windows or Linux computers!

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US$8.67
This breakout PCB set will make your life much much easier and get you prototyping faster than ever. One side has a 28-TSSOP pin out with traces going to two rows of 0.1" spaced holes, the other has 28-SOIC. Solder your chip to either side and you're ready to rock on any solderless breadboard.
Delivery within 2-3 weeks
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US$12.25
We found the best color sensor on the market, the TCS34725, which has RGB and Clear light sensing elements. An IR blocking filter, integrated on-chip and localized to the color sensing photodiodes, minimizes the IR spectral component of the incoming light and allows color measurements to be made accurately.
Delivery within 2-3 weeks
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US$19.25
A gyroscope is a type of sensor that can sense twisting and turning motions. Often paired with an accelerometer, you can use these to do 3D motion capture and inertial measurement.
Delivery within 2-3 weeks
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US$8.67
For when you want better audio for music playback, a USB audio card can greatly improve the sound quality and volume. We like this particular dongle for not being too bulky, you can plug it in without blocking the secondary USB port.
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US$12.17
Control the flow of fluid using the flow of electrons! This liquid valve would make a great addition to your robotic gardening project. There are two 1/2" (Nominal NPS) outlets.
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US$19.17
This solenoid in particular is fairly small, with a 30mm long body and a 'captive' armature with a return spring. This means that when activated with up to 24VDC, the solenoid moves and then the voltage is removed it springs back to the original position, which is quite handy.
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US$5.17
Make a nice portable power pack with this 4 x AA battery holder. It fits any alkaline or rechargeable AA batteries in series. There's a snap on cover and an on/off switch which can be handy when wiring to something without a switch.
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US$10.42
We crammed 8 of the tiny 5050 (5mm x 5mm) smart RGB LEDs onto a PCB with mounting holes and a chainable design. Use only one microcontroller pin to control as many as you can chain together!
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US$26.95
NOTE: This product is only designed for use with solar panels sold at the Adafruit store. We cannot guarantee this will work with solar panels purchased elsewhere. This charger is a very unique design, perfect for outdoor projects, or DIY iPod chargers. 
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US$22.95
This chip from FTDI is similar to their USB to serial converter chips but adds a 'multi-protocol synchronous serial engine' which allows it to speak many common protocols like SPI, I2C, serial UART, JTAG, and more!
Delivery within 2-3 weeks
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US$13.79

This 8"/200mm long swivel dipole antenna has 5dBi of gain and 50Ω impedance so it will work fantastically with just about any 2.4-2.5GHz wireless receiver/transmitter such as: 2.4GHz Wi-Fi (802.11b/g/n), 2.4GHz XBee, Bluetooth, Other 2.4GHz transceivers.

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