Sparkfun

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US$2.51

This 0.005" Muscle Wire (aka Nitinol) is a one foot long piece of nickel-titanium alloy that can flex and contract when a specific amount of heat or current is applied to it.

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US$3.15

This 0.012" Muscle Wire (aka Nitinol) is a one foot long piece of nickel-titanium alloy that can flex and contract when a specific amount of heat or current is applied to it.

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US$6.65
The TXB0104 is a 4-bit bidirectional voltage-level translator with automatic direction sensing. This 4-bit noninverting translator uses two separate configurable power-supply rails. The A port is designed to track VCCA.
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US$10.70
These metal push buttons are a very tough, small, panel-mount momentary switch with an illuminated red LED ring. It is a SPDT with 16mm threading and 1mm pitch.  This button is perfect for basic On/Off functions.
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US$10.70
These metal push buttons are a very tough, small, panel-mount latching switch with an illuminated white LED ring. It is a SPDT with 16mm threading and 1mm pitch.  This button is perfect for basic On/Off functions. Overall length (including leads) is 1.5" and has small solder lugs for connection.
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US$8.33
These metal push buttons are a very tough, small, panel-mount latching switch with an illuminated yellow LED ring. It is a SPDT with 16mm threading and 1mm pitch.  This button is perfect for basic On/Off functions.
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US$10.70
These metal push buttons are a very tough, small, panel-mount latching switch with an illuminated green LED ring. It is a SPDT with 16mm threading and 1mm pitch.  This button is perfect for basic On/Off functions.
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US$10.70
These metal push buttons are a very tough, small, panel-mount latching switch with an illuminated blue LED ring. It is a SPDT with 16mm threading and 1mm pitch.  This button is perfect for basic On/Off functions. Overall length (including leads) is 1.5" and has small solder lugs for connection.
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US$10.61
These metal push buttons are a very tough, small, panel-mount latching switch with an illuminated red LED ring. It is a SPDT with 16mm threading and 1mm pitch.  This button is perfect for basic On/Off functions. Overall length (including leads) is 1.5" and has small solder lugs for connection.
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US$1.33
This is a very useful, small, panel-mount momentary switch. It is a SPST N.O. with 1/4" threading.  This button is perfect for basic On/Off functions. Overall length (including leads) is 1.06" and has small solder lugs for connection. These momentary buttons are rated up to 0.5A and 250VAC.
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US$1.33
This is a very useful, small, panel-mount momentary switch. It is a SPST N.O. with 1/4" threading.  This button is perfect for basic On/Off functions. Overall length (including leads) is 1.06" and has small solder lugs for connection. These momentary buttons are rated up to 0.5A and 250VAC.
In stock
+
Add to wish list

US$1.33
This is a very useful, small, panel-mount momentary switch. It is a SPST N.O. with 1/4" threading.  This button is perfect for basic On/Off functions. Overall length (including leads) is 1.06" and has small solder lugs for connection. These momentary buttons are rated up to 0.5A and 250VAC.
In stock
+
Add to wish list

US$1.33
This is a very useful, small, panel-mount momentary switch. It is a SPST N.O. with 1/4" threading.  This button is perfect for basic On/Off functions. Overall length (including leads) is 1.06" and has small solder lugs for connection. These momentary buttons are rated up to 0.5A and 250VAC.
In stock
+
Add to wish list

US$10.70
These metal push buttons are a very tough, small, panel-mount momentary switch with an illuminated white LED ring. It is a SPDT with 16mm threading and 1mm pitch.  This button is perfect for basic On/Off functions. Overall length (including leads) is 1.5" and has small solder lugs for connection.
In stock
+
Add to wish list

US$10.70
These metal push buttons are a very tough, small, panel-mount momentary switch with an illuminated yellow LED ring. It is a SPDT with 16mm threading and 1mm pitch.  This button is perfect for basic On/Off functions.
In stock
+
Add to wish list

US$10.70
These metal push buttons are a very tough, small, panel-mount momentary switch with an illuminated green LED ring. It is a SPDT with 16mm threading and 1mm pitch.  This button is perfect for basic On/Off functions.
In stock
+
Add to wish list

US$10.70
These metal push buttons are a very tough, small, panel-mount momentary switch with an illuminated blue LED ring. It is a SPDT with 16mm threading and 1mm pitch.  This button is perfect for basic On/Off functions.
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US$1.33
The Small sized GTE (Goes To Eleven) Knob can fit onto potentiometers with a 6mm wide shaft thanks to a brass insert with a set screw.
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US$5.36
This is an add-on for your RedBot that gives your robot the ability to detect lines or nearby objects. The sensor works by detecting reflected light coming from its own infrared LED.
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US$2.73
This is our new Hobby Motor now with a 6mm, 10 tooth, gear to make your basic projects a little simpler to manage. It works well for basic things like making a fan or spinning something pretty fast without much resistance.
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US$28.31
This provides a new way to prototype your project without a breadboard. Everything is wired together on a single board, which makes it easy to explore the possibilities of the components before snapping them apart and building them into your project.
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US$2.73
You may be wondering what sets this guy apart from the more common CR2032 coin cell battery, the answer is actually quite important. The CR2025 is actually 0.7mm thinner, than the CR2032, and is only rated at 165mAh. Some applications need a thinner battery to conserve space, and the CR2025 fits the bill.
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US$1.33
Do you have an R/C vehicle battery pack that desperately needs a Deans connector? With our new M/F Deans connector pair, you'll have just what you need to safely and securely connect your battery or anything else that requires a mini T Plug.
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US$40.63
RFID (radio-frequency identification) is the wireless non-contact use of radio-frequency electromagnetic fields, for the purposes of identifying and tracking tags attached to objects. This is the ID-3LA, a very simple to use RFID reader module from ID Innovations. With a built in antenna, the only holdup is the 2mm pin spacing.
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US$0.97
These LED holders accept a 10mm LED and mount into an 35/64" diameter hole.
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US$0.97
These plastic LED holders have a black finish and only need the LED and the holder to be snapped into place easily and effectively, no screwing anything into place. These LED holders accept a 5mm LED and mount into an 19/64" diameter hole.
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US$16.33

This is an excellent choice for anything that requires a small battery with a lot of punch. The voltage is low enough not to tax your regulating circuits, and the discharge rate is high enough to accommodate a lot of electronics and a few small motors. The battery has two cells and outputs 7.4V storing 1000mAh of charge.

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US$84.47
This is about 360 yards of conductive thread spun from stainless steel fiber and wound on a spool. You can use it as a creative way to connect various electronics onto clothing projects. This large spool is a great way to get into wearable electronics without a large upfront cost and a large enough quantity to not be afraid of making a few mistakes. 
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US$20.93
The MPU-6000 is a serious little piece of motion processing tech! By combining a 3-axis gyroscope and a 3-axis accelerometer on the same silicon die...
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US$9.05
These 20AWG jumper wires work just like our smaller gauge premium jumpers except that they can handle a little more juice.
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US$8.78
These 20AWG jumper wires work just like our smaller gauge premium jumpers except that they can handle a little more juice.
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US$5.88
These nylon standoffs are 3/4" long and tapped for a 4-40 screw. These are great for mounting your board in an enclosure, or just getting it up off the table. The black nylon will give your project a very sessy look.
Delivery within 2-3 weeks
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US$26.53
This is a USB to RS-232 bridge converter which is very small and easy to use. It uses a mini-B type USB connector to connect to your PC and is based on the FTDI FT232RQ USB to Serial Bridge IC from FTDI. The μUSB-PA5 allows you to communicate with 4D Systems' screens and controllers.
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US$3.50

Plug your power supply into one end and the other into your project and, just like that, you've got a power switch! The on-off rocker switch has a good stiff 'click' to it, so it isn't easy to accidentally switch. It's also fairly small so it won't add too much unnecessary bulk to your project.

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US$3.43
Ethernet is now ubiquitous with embedded systems. Before you can get your set-top box on the internet, you'll need one of these single port, RJ45 ethernet jacks with built in transformer (magnetics), status LEDs, and shielding.
Delivery within 2-3 weeks
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US$2.73
This cable is terminated with 5.5x2.1mm barrel connectors, one male and one female, and fits most of our products that use a DC barrel jack for power (RedBoard, RaspiRobot board, etc.).
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US$2.73
These 0.1" spaced female headers are perfect for building your own Raspberry Pi add-on modules. These PTH headers are arranged in 2 rows of 13 and mate with the Raspberry Pi GPIO header.
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US$25.20

After you've assembled it, simply plug the RaspiRobot Board into the GPIO port on the Raspberry Pi and it provides dual bi-directional motor controllers, two open collector outputs, two switch inputs, a pair of status LEDs and even a voltage regulator capable of powering the Pi using a battery source from 7-12VDC.

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US$20.93
This collection of common buttons and switches will ensure that you've got the right button for the job. There are 14 switches total of 5 different varieties that we use in projects every day here. Includes: 4 x Panel Mount Momentary Switch. 4 x Simple Pushbutton Switch. 2 x Omron Snap Action Switch. 2 x Round Rocker Switch. 2 x Mini Power Switch.
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US$2.12
Simple IDC ribbon cable. Used for AVR programming, general communication, and all around handy-ness. Cable length is 6".
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US$2.80
DB9 female header - right angle PCB mount. 0.318" Style.
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US$0.70
A staple for the electrical engineer. I can't tell you how many times I've been one clip short! Sold in single units.
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US$0.97
This is a simple 3.5mm TRS stereo audio jack with a screw-on plastic shroud. These are great for projects that plug into headphone jacks. Stereo plugs can also be used for carrying serial comm connections!
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US$4.13

These are a longer version of our standard break away headers. They are 20mm long which allows you use them socket to socket. The plastic separator can be slid up or down to accommodate your needs. You will get a row of 40 pins. They can be broken or snipped to length.

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US$1.33
These LR44 button cell batteries are fairly common but it can be hard to keep them around. They fit our digital calipers, so if you use yours as much as we use ours, you may want to go ahead and pick up a spare.
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US$2.73

3V 12mm 47mAh coin cell batteries. Perfect small battery for miniature sensor node applications. 12.5mm x 2.5mm. Note: You are only getting one battery.

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US$4.13
The MMA8452Q is a smart low-power, three-axis, capacitive micromachined accelerometer with 12 bits of resolution. This accelerometer is packed with embedded functions with flexible user programmable options, configurable to two interrupt pins.
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US$1.33
Comes in 2 or 3 positions and have the really cool feature of slide-locking together to form any size you need (4, 5, up to 20 without problems). Rated up to 125V @ 6A. Terminal can accept 30 to 20AWG wire. 3.5mm/138mil pin pitch will not fit standard 0.1" perf boards but this is the most common pitch screw terminal.
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US$1.33
Comes in 2 or 3 positions and have the really cool feature of slide-locking together to form any size you need (4, 5, up to 20 without problems). Rated up to 125V @ 6A. Terminal can accept 30 to 20AWG wire. 3.5mm/138mil pin pitch will not fit standard 0.1" perf boards but this is the most common pitch screw terminal.
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US$2.45
These connectors are made from high-temp nylon with gold-plated spring pins or sockets molded in. The shape of the XT60 prevents reverse polarity, and when plugged in the connection is super-solid. Perfect for applications up to and beyond 65A continuous draw. Sold in pairs of 1 male and 1 female connector.
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US$4.13
This is a high-quality, easy to use 28 pin ZIF socket that is 0.3" wide. Makes for easy connecting or programming to DIP ICs. Uses high conductivity terminals create solid connections. Can also be used for smaller pin packages.
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US$0.63
Polarized connectors and headers for your perf board/PCB projects. Use these connectors for power connections or any sensor/general connection to prevent users from connecting the peripheral incorrectly or reversed.
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US$14.84
This is a mixed pack of 26 LEDs all conveniently packaged in a nice reusable ESD safe bag. They include the most used colors so you will always have what you need on hand. Make that next project shine!
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US$3.49
This is a simple LED-illuminated tactile button with a red cap. It's just like a basic tactile button, but it lights up red! So now you can get visual feedback, or light up your project. These have a 12mm body and are rated for 50mA.
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US$2.12
This is a 3-terminal microswitch, with a small push-button. This switch has a great 'clicky' sound to it, and a nice tactile feel.
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US$2.10
Simple SPDT Switch. Rated at 30V/200mA. The pins have .1" spacing - fits great into a breadboard! Use it as a power switch or general control switch.
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US$1.25
This is a simple SPDT slide switch - great for use as an ON/OFF button, or just as a general control switch. The pins are spaced by 0.1", so it's breadboard friendly. The switch is rated for 0.3A at 50VDC.
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US$6.93
Yes you read that correctly - 10Farad capacitor. This small cap can be charged up and then slowly dissapated running an entire system for hours. Combine two in series for 5F/5V. Do not over voltage or reverse polarize these capacitors.
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US$6.31
Yes you read that correctly - 1 Farad capacitor. This small cap can be charged up and then slowly dissapated running an entire system for hours. Combine two in series for 0.5F/5V. Do not over voltage or reverse polarize these capacitors.
Delivery within 2-3 weeks
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US$8.97
These tactile buttons are great for all sorts of projects. This assortment comes with 2 of each of 6 different colors for a total of 12 buttons. The colored caps are removable and the buttons fit into breadboards. See the drawing below for exact dimensions.
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US$2.73
This is a heavy duty SPST toggle switch - your basic on/off toggle. Rated for 2A at 250V or 4A at 125V. Includes a face plate and two threaded nuts for mounting. Works great with our missile switch cover.
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US$30.73

Features: 25 RGB LEDs. Standard size - T1 3/4 5mm. 2800/6500/1200 mcd brightness. 2.0V/3.2V/3.2V forward drop. Max current 20mA.

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US$1.33
These are very bright LEDs. The LEDs are so bright that it hurts to look directly at them.
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US$23.73
Digital calipers are an absolute essential. Here at SparkFun we use them all the time. These premium calipers come with an extra battery and auto shut-off. Measurements can be taken in either metric or standard. The calipers are 6" in length and make a great addition to any tool set.
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