Adafruit

US$9.17
This is a tidy little design that lets you control a DC power source using an everyday tactile button. The breakout uses a latching analog circuit that is triggered by a push of the button. Press once to turn on, then press again to turn off.
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US$2.02
Make your own USB connections without slicing apart a USB cable and soldering those thin wires inside. These DIY "USB shells" are available in USB A plug 1387-ADA, and micro B.
Delivery within 2-3 weeks
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US$2.02
Make your own USB connections without slicing apart a USB cable and soldering those thin wires inside. These DIY "USB shells" are available in USB A plug, and micro B 1390-ADA. Each shell comes with a two-part snap plastic shell and a proper connector with easy-to-solder tabs.
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US$12.17
This 2-button keyfob remote goes with our three basic 315MHz RF receiver modules. It will work with all of them, sending out one of two commands that match up with the last two of four outputs.
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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 48-QFP pin out with traces going to two rows of 0.1" spaced holes, the other has 48-QFN (7mm body). Solder your chip to either side and you're ready to rock on any solderless breadboard.
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US$29.67
These LED's use about 9.5 Watts max (~2 Amps @ 5V) per meter. The max rating is assuming all the LEDs are on full white, usually the actual current for colorful design is about 1/3 to 1/2 the max current. A good power supply such as our 5V 2A or 10A supply is key!
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US$10.42
This is the simplest way to create a project with a single "toggle" capacitive touch sensor. No microcontroller is required here - just power with 1.8 to 5.5VDC and touch the pad to activate the sensor.
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US$9.49
This is the simplest way to create a project with a single "momentary" capacitive touch sensor. No microcontroller is required here - just power with 1.8 to 5.5VDC and touch the pad to activate the sensor.
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US$5.25
This is the "I use Linux!" badge for use with educators, classrooms, workshops,Maker Faires, TechShops, Hackerspaces, Makerspaces and around the world to reward beginners on their skill building journey! 
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US$8.67
They're just like 2x23 0.1" spaced female headers but with a twist! The 'legs' are extra-long so you can solder it -through- a PCB and plug it into the Bone.
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US$5.25
This is the "I made something with a Beagle Bone" badge for use with educators, classrooms, workshops, Maker Faires, TechShops, Hackerspaces, Makerspaces and around the world to reward beginners on their skill building journey! 
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US$42.72

Add a typing interface to your project with this microcontroller-friendly miniature keyboard. We found the smallest PS/2+USB keyboard available, a mere 8.75" x 4.65" x 0.6" (220mm x 118mm x 16mm)! It's small but usable to make a great accompaniment to either a microcontroller project or a computer such as the Beagle Bone or Raspberry Pi.

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US$10.42
Simply plug in the gold plated contacts into any USB port and a 3.7V/4.2V lithium polymer or lithium ion rechargeable battery into the JST plug on the other end. There are two LEDs - one red and one green. While charging, the red LED is lit. When the battery is fully charged and ready for use, the green LED turns on.
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US$5.17
This keypad has 4 buttons, and since every key has its own wire line, no matrix code is required - just treat these like every day switches. The membrane is soft and has a removable paper backing to expose a strong adhesive so you can stick this on an enclosure and feed the cable through a slot.
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US$39.94
We found the smallest wireless USB keyboard available, a mere 6" x 2.4" x 0.5" (152mm x 59mm x 12.5mm)! It's small but usable to make a great accompaniment to a computer such as the Beagle Bone or Raspberry Pi. The keyboard itself is battery powered (there's a rechargeable battery inside that you charge up via the included USB cable).
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US$11.95

This provides the simplest way to create a project with mutiple capacitive touch sensors. 

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US$10.42
Made of 3mm black acrylic pieces, with 4 x 1" nylon screws & 4 x nylon hex nuts, it goes together in a jiffy and looks super-spiffy!
Delivery within 2-3 weeks
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US$7.91
It's pressure-sensitive: squeezing it will reduce the resistance, so it's handy for making flexible sensors.
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US$34.92
The enclosure comes as 6 laser cut acrylic pieces, 4 plastic standoffs, 8 hex-nuts and 8 1/2" 4-40 screws. Assembly is easy, and requires only a Phillips screwdriver. Once assembled, the box has lovely engraved ends with cut-outs for the DC power, Ethernet, microSD card, USB host and USB debug ports.
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US$3.50
Connect this to that with an IDC cable! This cable has 10 pins (2x5) in 0.1"x0.1" spacing. Often used for programming AVRs. 6" long with two sockets crimped onto either side, they're quite sturdy!
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US$8.67
This coupler will connect a 5mm diameter shaft to an 8mm diameter shaft. A perfect add on for our stepper motors. Comes with two sets of double set-screws (two per side) for secure attachment. 
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US$8.67
This coupler will connect a 5mm diameter shaft to a 10mm diameter shaft. A perfect add on for our stepper motors. Comes with two sets of double set-screws (two per side) for secure attachment.
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US$26.17
This SHARP distance sensor bounces IR off objects to determine how far away they are. It returns an analog voltage that can be used to determine how close the nearest object is. Comes with 12" long 3-JST interface wire. These sensors are good for short-range detection. For over 1 m distance, we suggest using sonar sensors.
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US$17.42
This is a pre-wired and waterproofed version of the DS18B20 sensor. Handy for when you need to measure something far away, or in wet conditions. While the sensor is good up to 125°C the cable is jacketed in PVC so we suggest keeping it under 100°C.
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US$10.42
This button is a momentary push button, when you press it the 'normally-open' contact shorts to the common contact. When you release it, the contacts open up again. The switch and LED are separated, so you could wire it to turn on when pressed or vice versa or whatever you wish!
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US$10.78
FSRs are sensors that allow you to detect physical pressure, squeezing and weight. They are simple to use and low cost. This sensor is a Interlink model 402 FSR with 1/2 diameter sensing region.
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US$15.33
Features: K type thermocouple with glass over-braiding. Good up to 500 °C (900 °F)! Color-coded wires. 1 meter long (a little more than 3 feet). Best used with a thermocouple amplifier such as the MAX6675 or MAX31855. 
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US$7.00
These 1-wire digital temperature sensors are fairly precise (±0.5°C over much of the range) and can give up to 12 bits of precision from the onboard digital-to-analog converter.
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US$75.17
The eTape Liquid Level Sensor is a solid-state sensor with a resistive output that varies with the level of the fluid. It does away with clunky mechanical floats, and easily interfaces with electronic control systems. The eTape sensor's envelope is compressed by the hydrostatic pressure of the fluid in which it is immersed.
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US$26.95
Filling out our accelerometer offerings, we now have the really lovely digital ADXL345 from Analog Devices, a triple-axis accelerometer with digital I2C and SPI interface breakout. We added an on-board 3.3V regulator and logic-level shifting circuitry, making it a perfect choice for interfacing with any 3V or 5V microcontroller such as the Arduino.
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US$10.42
This button is an on/off switch button, when you press it the 'normally-open' contact shorts to the common contact and the button stays 'pressed'. When you press it a second time, the button springs open, and the contacts open up again. 
Delivery within 2-3 weeks
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US$1.75
CdS cells are little light sensors. As the squiggly face is exposed to more light, the resistance goes down. When its light, the resistance is about 5-10KΩ, when dark it goes up to 200KΩ.
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