Electromechanical

US$0.91
Miniature Single Pull Single Throw switches. These are high quality Omron type B3F momentary on switches. This switch has a very large 10mm tall button. Perfect as an embedded switch behind an enclosure wall. Rated up to 50mA.
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US$3.00
This is a hot red safety cover which protects a toggle switch from accidentally being turned on.
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US$1.39
This is a surface mount momentary switch. Perfect for reset or general inputs.
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US$4.13
This is a rotary switch with 16 selectable positions. With only 6 pins (2 of which are common), you can select 16 positions. The switch is breadboard compatible and has a nice solid feel to it.
Delivery within 2-3 weeks
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US$2.73
This is a surface mount 5-way tactile switch allows for a joystick-like interface in a very small package. Sometimes you want a small input and a single button just won't cut it. These are surface mount, but easily soldered.
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US$6.92
This keypad has 12 buttons, arranged in a telephone-line 3x4 grid. It's made of a thin, flexible membrane material with an adhesive backing (just remove the paper) so you can attach it to nearly anything. The keys are connected into a matrix, so you only need 7 microcontroller pins (3-columns and 4-rows) to scan through the pad.
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US$2.51
You can use these for tap or knock sensors pretty easily by reading the voltage on the output. They can also be used for a very small audio transducer such as a buzzer.
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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$3.91
Earphone, 8 ohm, with 10ft twisted stranded wire, 1/8" plug termination and ear support.
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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$2.58

Black X shape knob with a white line indicator on one of the wing. Plastic knob with brass insert and set screw fittings. This knob will fit for .25" shafts. Diameter 0.90" and height is 0.71".

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US$2.58

Black knob with a white dot indicator. Plastic knob with brass insert and set screw fittings. This knob will fit for .25" shafts. Diameter 0.50" and height is 0.61".

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US$2.58

Black knob with a white dot indicator. Plastic knob with brass insert and set screw fittings. This knob will fit for .25" shafts. Diameter 0.78" and height is 0.61".

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US$2.58

Black knob with a white dot indicator. Plastic knob with brass insert and set screw fittings. This knob will fit for .25" shafts. Diameter 0.94" and height is 0.76".

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US$7.99

An aluminum knob with knurled edge grip and a notched top indicator. Plastic knob with brass insert and set screw fittings. This knob will fit for .25" shafts. Diameter 0.50" and height is 0.61".

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