Sparkfun

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US$6.08

This is a simple plastic plate that holds an Arduino (Mega R3 or Uno) and self adhesive breadboard. This version still holds an Arduino and a self-adhesive clear breadboard but we've done away with the plastic clips and now provide screws which give you a more solid and simple connection.

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US$27.93

This is a 5V Arduino running the 16MHz bootloader meant for advanced users that understand the limitations of system voltage. Arduino Pro does not come with connectors populated so that you can solder in any connector or wire with any orientation you need.

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US$16.73

This is a 3.3V Arduino running the 8MHz bootloader meant for users that understand the limitations of system voltage. It's a great board that will get you up and running quickly.

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US$20.93

This is a kit containing all the parts you need to assemble a joystick shield that can sit on top of your Arduino and turn it into a simple controller. Five momentary push buttons (4+ joystick select button) and a two-axis thumb joystick gives your Arduino functionality on the level of old Nintendo controllers. 

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US$25.13

This is a package Joystick Shield Kit that requires assembly all inside a clear clamshell. Five momentary push buttons (4+ joystick select button) and a two-axis thumb joystick gives your Arduino functionality on the level of old Nintendo controllers. 

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US$23.73

This is a 16X2 Character LCD inside a clear clamshell package. This is an add-on to the SparkFun Inventor's Kit (SIK) which gives you the ability to use an LCD as a visual interface for your project.

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US$23.73

This can equip your Arduino with mass-storage capability, so you can use it for data-logging or other related projects. All new microSD shields have a voltage converter chip on-board that converts the Arduino 5V signals to 3.3V signals in accordance with SD specifications.

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US$34.73

This provides a very easy way to start using MOSFETS for your next high current project. This shield allows you to use a computer power supply (or any other power source) to use your Arduino to switch high current. With RFP30N06LE MOSFETS, you can easily control a lot of current directly from your Arduino.

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US$20.93

This is a basic breakout board for the FTDI FT232RL USB to serial to work with official Arduino and cloned 5V Arduino boards.

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US$25.13

This is a FTDI cable converter which allows for a simple way to connect serial (TTL) interface devices to USB. The I/O pins of this FTDI cable are configured to operate at 5V. The FTDI cable is designed around an FT232RQ, which is housed in a USB A connector.

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US$25.13

This is a FTDI cable converter which allows for a simple way to connect serial (TTL) interface devices to USB. but also configured to operate at 5V with 3.3V I/O. The FTDI cable is designed around an FT232RQ, which is housed in a USB A connector.

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US$111.93
This  is a package GPS Shield Kit with EM406 GPS receiver and headers included inside a a clear clamshell. Adding GPS to your Arduino has never been easier. Multiple GPS receivers attach easily to the shield, and with the example sketch, you will be able to locate your exact position within a few meters.
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US$20.93

A great way to build simple capacitive touch interfaces, and now it's even easier to incorporate into your Arduino projects with the touch shield. The touch shield has 9 capacitive touch pads, with headers for the remaining 3 electrode connections. With this shield you can have a total of 12 touch sensitive buttons.

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US$6.93
This is a small PCB that adapts the standard Microchip 6-Pin RJ11 connector to the Olimex 6-Pin .1" Molex Connector.
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US$9.05
This is a breakout board for the very handy 16-Channel Analog/Digital Multiplexer/Demultiplexer CD74HC4067. This chip can be used to connect 16 analog sources (like sensors) to 5 pins on a microcontroller.
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US$15.33
This is a tiny breakout board and the microphone's input can fit flush against the enclosure of your project. The amplifier on the breakout has a gain of 67 and more than meets the bandwidth requirements of the mic.
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US$4.92
This is a PCB designed for the L298N Full-Bridge dual motor driver IC (multiwatt package). All pins of the L298N are broken out to a 15-pin 0.1" pitch header. Two mounting holes are also provided. Dimensions: 1.6x0.85 inches.
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US$6.93
This is a simple breakout board that uses a vertical SMD connector for the EM401 or EM406 GPS module cables.
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US$2.45
This is a PCB for the LED tactile button and easy to use on your next project. Populate the board according to the polarity of the LED on the switch. The markings for the switch are irrelevant and can be reversed.
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US$8.10
This is a simple Op Amp breakout board, set up as a 2-stage amplifier with a gain of 100 (gain of 10 for each stage). The on-board trim pot sets the signal level between the stages, not the feedback path. The bandwidth is set to 15.9kHz by a pair of feedback capacitors, or over 100kHz with the caps removed.
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US$13.93
Breakout board for the microSD socket that is not much bigger than your fingernail. Compatible with the SPI interface found on any SD card, this tiny form factor was created for cell phone storage and is perfect for your next MP3 project!
Delivery within 2-3 weeks
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US$2.73
This is a small PCB that brings out the pins of the RJ45 connector to an in-line 0.1" footprint. Use with break-away headers for breadboarding or create your own RJ45 cable connection.
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US$3.43

This is a PCB for the Thumb Joystick. Pins are broken out to a 0.1" header and includes 4 mounting holes in the corners. Dimensions: 1" X 1.25"

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US$9.05
This is a board designed for opto-isolation and electrically isolates a controller from the high-power system by use of an opto-isolator IC. This board is helpful for connecting digital systems (like a 5V microcontroller) to a high-voltage or noisy system.
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US$6.52
This is a breakout for the SOIC version of the 74HC595 shift register IC. Clock in data and latch it to free up IO pins on your micro. All pins from the IC are broken out to standard 0.1" spaced headers.
Delivery within 2-3 weeks
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US$5.53

This is a breakout board made for 20 pins SOIC style. This custom PCB will interface a standard SOIC package IC to 0.1" headers, which are easier to work with and integrate well with breadboards. There is DIP-standard 0.6" spacing between the two rows of pins.

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US$5.53

This is a breakout board made for 28 pins SOIC style. These are custom PCB boards that interface standard SOIC devices to standard .1" headers. Standard .6" spacing between pins. Will fit directly into a standard width (600 mil) DIP socket. For wide ICs (memories, drivers, 74s, etc).

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US$1.33
This is a breakout board made for SOT23 style. 6 pin SOT-23 to DIP adaptor. Created to take SOT23 of various pin sizes breakout to DIP. This will work with 3-pin MOSFETs, BJTs, Voltage Regulators (SOT-23-5), and various other Micro6, Micro5, etc packages. DIP width is 0.300" (300mil) and will fit nicely into any breadboard or DIP socket.
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US$4.13
8, 16, 20, and 28-Pin SSOP to DIP break out boards. The footprint was rotated to accommodate different width SSOP devices and can be used with any pin count up to 28 pins. Designed to be used with 0.65mm pitch devices but can also be used with 0.025" pitch devices (comes out to ~0.635mm). We've made these 0.635mm devices fit just fine.
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US$5.53
8, 16, 20, and 28-Pin SSOP to DIP break out boards. The footprint was rotated to accommodate different width SSOP devices and can be used with any pin count up to 28 pins. Designed to be used with 0.65mm pitch devices but can also be used with 0.025" pitch devices (comes out to ~0.635mm). We've made these 0.635mm devices fit just fine.
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US$4.13
This board breaks out all 20 pins of the XBee to a 0.1" standard spacing dual row header. The spacing between 0.1" headers is 0.5" making it breadboard DIP friendly.
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US$4.13
8-Pin SSOP to DIP break out board. The footprint was rotated to accommodate different width SSOP devices and can be used with 8 pin SSOPs. Designed to be used with 0.65mm pitch devices but can also be used with 0.025" pitch devices (comes out to ~0.635mm). We've made these 0.635mm devices fit just fine.
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US$24.26
This is a 16 channel PWM unit with 12 bit duty cycle control (0-4095), 6 bit current limit control (0-63), and a daisy chainable serial interface. This breakout board is a good way to take full advantage of this useful IC. All 16 PWM channels are broken out to standard 0.1" headers, which run alongside convenient voltage and ground rails.
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US$162.33

This is the comprehensive guide to ZigBee wireless networks. This kit includes many of the parts and pieces you will need to work through the examples in the book. If you're serious about learning everything you need to know about XBee networks, this kit and the book will get you up to speed in no time (or as long as it takes you to get through the book).

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US$20.93

This is an LED-based “candle” that cycles through all the colors of the rainbow. The LectroCandle is a simple, through-hole kit, comprised mainly of 3 RGB LEDs and an ATtiny85 to control them.

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US$41.93
This is a board that allows you to control up to two DC motors using a serial command interface. The serial interface is easy to use and it lets the user select an individual motor, the direction, and the desired speed constant (up to 10 different speed from stop to full speed).
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US$4.50
This is a simple-to-use Carbon Monoxide (CO) sensor, suitable for sensing CO concentrations in the air. The MQ-7 can detect CO-gas concentrations anywhere from 20 to 2000ppm.
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US$99.95
This is a fingerprint scanner capable of gathering and storing unique finger prints. The Nitgen RS232 serial fingerprint scanner is a powerful ADSP-BF531 Blackfin based system. Simply hold your finger on the optical scanner, query the device over serial, and you will be issued a unique ID. Use that ID within your embedded system to determine access levels, time clocks, door locks, etc.
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US$1.33

This is a PCB made for the MQ-3, MQ-4, MQ-6 and MQ-7 gas sensors.

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US$20.93
This is an optical air quality sensor, designed to sense dust particles. An infrared emitting diode and a phototransistor are diagonally arranged into this device, to allow it to detect the reflected light of dust in air.
Delivery within 2-3 weeks
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US$29.99
A simple flex sensor 4.5" in length. Patented technology by Spectra Symbol - they claim these sensors were used in the original Nintendo Power Glove. The resistance of the flex sensor changes when the metal pads are on the outside of the bend (text on inside of bend).
Delivery within 2-3 weeks
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US$35.78
The harder you press, the lower the sensor's resistance. Pressing hard, the resistance changes from infinite to ~300k. The sensor itself is thin and flexible, but the resistance does not change while being flexed. Resistance changes only when pressure is applied to the round area at the end of the sensor.
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US$36.74
The harder you press, the lower the sensor's resistance. Pressing hard, the resistance changes from infinite to ~300k. The sensor itself is thin and flexible, but the resistance does not change while being flexed. Resistance changes only when pressure is applied to the round area at the end of the sensor.
Delivery within 2-3 weeks
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US$35.29
This is a very long force sensitive resistor - over 2 feet - has a sensing area of 0.25x24". This FSR will vary its resistance depending on how much pressure is being applied to the sensing area. The harder the force, the lower the resistance.
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US$10.51
This is a small force sensitive resistor of 1 3/4" length and has a 0.16" (4 mm) diameter active sensing area. This FSR will vary its resistance depending on how much pressure is being applied to the sensing area. The harder the force, the lower the resistance.
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US$18.80
This is a force sensitive resistor with a square sensing area of 1.75x1.5". This FSR will vary its resistance depending on how much pressure is being applied to the sensing area. The harder the force, the lower the resistance. When no pressure is being applied to the FSR its resistance will be larger than 1MΩ.
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US$9.73
The harder the force, the lower the resistance. When no pressure is being applied to the FSR its resistance will be larger than 1MΩ. This FSR can sense applied force anywhere in the range of 100g-10kg.
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US$37.73
This is a contactless linear potentiometer used for liquid level and other harsh applications. This innovative sensor allows designers to retroactively assemble the sensor on the outside of pneumatic and hydraulic cylinders, which connects with the internal magnet of the cylinder.
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US$8.97
This is a basic piezo sensor that is often used for flex, touch, vibration and shock measurements. A small AC and large voltage (up to +/-90V) is created when the film moves back and forth. A simple resistor should get the voltage down to ADC levels. Can also be used for impact sensing or a flexible switch.
Delivery within 2-3 weeks
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US$10.22
This is a basic piezo sensor with a mass attach to the tip often used for flex, touch, vibration and shock measurements. A small AC and large voltage (up to +/-90V) is created when the film moves back and forth. A simple resistor should get the voltage down to ADC levels. Can also be used for impact sensing or a flexible switch.
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US$9.74
This is a vertical attachment of a  low-cost cantilever-type vibration sensor loaded by a mass to offer high sensitivity at low frequencies.
Delivery within 2-3 weeks
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US$13.69
This is a membrane of resistance built inside a flex strip of 50mm. These are very thin variable potentiometers. By pressing down on various parts of the strip, the resistance linearly changes from 100Ohms to 10,000Ohms allowing the user to very accurately calculate the relative position on the strip.
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US$67.50

This Liquid Level Sensor from Milone Technologies is a great way to measure the level of a liquid. It has 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.

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US$2.54
This is a basic tilt switch that can easily be used to detect orientation. Inside the can are a pair of balls that make contact with the pins when the case is upright. Tilt the case over and the balls don't touch, thus not making a connection.
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US$1.33
This is a high quality, 30mil standard card with a low coercivity magnetic stripe. The stripe can contain up to 3 tracks of information. This card can be erased and written multiple times with a compatible writer.
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US$5.53
By eliminating the resistor and changing the orientation of the surface mount LED we've shrunk the board down which looks great in elegant designs or on sheer fabrics where you don't need the extra weight or exposed board space. It's really the closest you can come to sewing a point of light directly to your project.
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US$3.36
This is a simple slide switch for the LilyPad. Use it as a simple ON/OFF switch, or to control LEDs, buzzers, sensors, etc.
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US$7.52
This sensor will output 0.5V at 0 degrees C, 0.75V at 25 C, and 10mV per degree C. Doing an analog to digital conversion on the signal line will allow you to establish the local ambient temperature.
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US$4.90
Use the Tri-Color LED board as a simple indicator, or by pulsing the red, green, and blue channels, you can create any color. Very bright output.
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US$12.05

Apply 5V and be shaken by this small, but powerful vibration motor. Works great as an physical indicator without notifying anyone but the wearer.

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US$2.73
Side-looking Infrared Emitters and IR Detectors. These simple devices operate at 940nm and work well for generic IR systems including remote control and touch-less object sensing.
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US$2.10
This is a 3-pin JST connector with red, black, and yellow wire colors cut to a length of 5 inch out. This cable comes fully assembled as shown and connects directly to many different Sharp sensors. Quick and easy, this cable will save you 15-20 minutes over making your own wiring harness.
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US$2.79
A simple breakout PCB for the GP1A57HR photo interrupter. This PCB has three connections for PWR, GND, and Signal. When the gate is clear, SIG will be high (>4.9V). When the gate is blocked by a finger, writing utensil, food pellet, or anything else - SIG will go low (<0.4V).
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US$4.92

This is QRE1113 breakout board features a digital output, using a capacitor discharge circuit to measure the amount of reflection. This tiny board is perfect for line sensing when only digital I/O is available, and can be used in both 3.3V and 5V systems.

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