Electromechanical

US$3.42
These are standard '130 size' DC hobby motors. They come with a wider operating range than most toy motors: from 4.5 to 9VDC instead of 1.5-4.5V. This range makes them perfect for controlling with an Adafruit Motor Shield, or with an Arduino where you are more likely to have 5 or 9V available than a high current 3V setting.
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US$8.67
This is a great first stepper motor, good for small projects and experimenting with steppers. This uni-polar motor has a built in mounting plate with two mounting holes. 
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US$3.42
Two wires are used to control/power the vibe. Simply provide power from a battery or microcontroller pin (red is positive, blue is negative) and it will buzz away. Works from 2V up to 5V, higher voltages result in more current draw but also a stronger vibration.
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US$11.46
These buttons are bigger than the 6mm ones we carry, and come in a pack of 15. Each button comes with a candy-colored square cap that snaps on. You get three of each color-- blue, grey, yellow, green, and red. The square plastic button tops affix easily to the tactile switch body.
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US$10.42
These buttons are bigger than the 6mm ones we carry, and come in a pack of 15. Each button comes with a candy-colored round cap that snaps on. You get three of each color-- blue, grey, yellow, green, and red. The round plastic button tops affix easily to the tactile switch body
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US$3.42
A mini roll of thermal paper, this fits very nicely into our mini thermal printer. 2.25" wide (about 57mm) and 50 feet long (15 meters). BPA-free. Perfect for use with our mini thermal printer!
Delivery within 2-3 weeks
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US$2.72

This low-cost 2.50 inch speaker is ideal for hobbyists and schools. Miniature Speaker, 13 Watts @ 8 ohms.

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US$4.73
These things are super powerful. 1/2" diameter, 3/16" thick discs, south side is marked with a red line. Great for use with your SpokePOV Kit. If you have an aluminium frame, use tape/foamstickytape to attach it.
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US$78.75

Build a custom USB gamepad that has an accelerometer mouse inside! This project pack comes with: SNES controller, Teensy, Accelerometer, 5' mini-B USB cable, 8" of ribbon cable, 2 squares of foam tape. 

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US$24.50
A stepper motor to satisfy all your robotics needs! This 4-wire bipolar stepper has 1.8° per step for smooth motion and a nice holding torque. The motor was specified to have a max current of 350mA so that it could be driven easily with an Adafruit motor shield for Arduino (or other motor driver) and a wall adapter or lead-acid battery.
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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$1.11
Miniature audio transducer PC Mount 8mm x 12mm DC Res.: 45 Ohms Opt. Freq: 2500 Hz.
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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$38.50
Control the flow of fluid using the flow of electrons! This liquid valve would make a great addition to your robotic gardening, aquarium, or pool project. There are two 1/2" (Nominal NPT) outlets.
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US$23.73
The upgraded Arduino Input Shield includes a two axis mini joystick (with moment switch) as well as four colored push buttons(Red,Yellow,Blue,Green).
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