Electromechanical

US$18.13
Each wheel encoder kit consists of two neodymium 8-pole magnets with rubber hubs and two hall-effect sensors terminated with 150mm cables and 3-pin female servo headers. These wheel encoders require a supply voltage of 3-24V with a supply current of 4mA.
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US$20.93
The 16A relay module can be used in interactive projects. It can also be used to control the lighting, electrical and other equipments. It can be controlled through the digital IO port, such as solenoid valves, lamps, motors and other high current or high voltage devices.
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US$8.67
These are half the width of classic 6mm tactile switches so they line up better on a breadboard, just plug them into every-other row. These work best in a PCB but can be used on a solderless breadboard. The two pins are normally open (disconnected) and when the button is pressed they are momentarily closed.
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US$5.69
These work best in a PCB but can be used on a solderless breadboard. The pins are normally open (disconnected) and when the button is pressed they are momentarily closed. These are extra tall which are useful when putting your project in an enclosure and you want the buttons to stick out.
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US$12.53
Features: Barrel-shaped Plated with bright Nickel for added durability Very powerful magnets Permanent magnetic strength Specifications: Material: rare earth (Neodymium) Rating: N35 ~ N45 Dimensions: Ø31/64" x 1/8".
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US$23.80
Features: Barrel-shaped. Plated with bright Nickel for added durability. Very powerful magnets. Permanent magnetic strength. Specifications: Material: rare earth (Neodymium). Rating: N35 ~ N45. Dimensions: Ø13/32" x 13/64".
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US$11.13
Features: Barrel-shaped. Plated with bright Nickel for added durability. Very powerful magnets. Permanent magnetic strength. Specifications: Material: rare earth (Neodymium). Rating: N35 ~ N45. Dimensions: Ø23/32" x 1/8".
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US$6.25
This adapter is especially designed for DFRobot 12V DC Motors.
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US$2.79
Coil voltage: 12V DC. Coil resistance: 360ohm. Contact: 1 x inverter. Nom. power consumption: 450mW. Dielectric strength: 1000V / 50Hz (1 minute). Temperature range: -40°F to 158°F. Internal contact material: AgCd0.
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US$2.27
The piezoelectric ceramic buzzer has a simple structure in which a ceramic piezo-element is glued to a vibration plate.
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US$8.33

Specifications: ABS. Wired siren. Operating voltage: 6-15Vdc. Current consumption (at 12Vdc with siren): 200mA. Oscillating frequency: 1.5-3.5kHz. Sound pressure level (at 1m): 107dBA. Dimensions: 1.5" x 1.7" x 2.2". Mounting holes: 0.87".

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US$1.84
It's not that exciting, no LEDs, no bells & whistles. But we really like it anways, look at that lovely rounded shape, that elegant bevel. If you're going to go with a momentary pushbutton, let it be this one! 
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US$1.99
It's not that exciting, no LEDs, no bells & whistles. But we really like it anways, look at that lovely rounded shape, that elegant bevel. If you're going to go with a momentary pushbutton, let it be this one! 
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US$1.99
It's not that exciting, no LEDs, no bells & whistles. But we really like it anways, look at that lovely rounded shape, that elegant bevel. If you're going to go with a momentary pushbutton, let it be this one! 
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US$5.53

Specifications: Illumination: Green LED (12V). Contact rating: 16A/ 12Vdc. Electrical life: 20000 cycles. Mechanical life: 50000 cycles. Contact resistance: 50mohm. Insulation resistance: min. 100Mohm at 500Vdc. Dielectric strength: 1500Vac / 1 minute.

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