Electromechanical

US$6.14
One Channel Single 5VDC Omron solid state relays. Rated: 240VAC / 2A. Output fused at 2A. Relay Power: +5VDC.
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US$18.62

Circuit breaker with two poles, rated for 15A, with a white toggle. The mounting threads fit #6-32 screws.

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US$1.82
Right-angled momentary push-button rated for 1A.
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US$1.99

Standard SPST momentary rocker switch, rated for 0.4A at 20V DC.

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US$1.82
7201-RA-MOM-HOR DPDT (On)-Off-(On) PC Mount 90° Miniature Toggle Switch 6A 125V These are ABRA's best selling high quality low cost miniature toggle...
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US$27.93
Control a single motor in either forward or reverse direction by using this single module. The other end consists of a 2 x 4 header for connect a simple 5v logic from any microcontroller and some pwm signal to control the direction and speed. The other end can take an input voltage from 5 – 27v supply, flip the board to see the B marking. The output is W marking where you can connect any motor that can run from the input voltage range of 5 to 27v. You can put a maximum of 43A to this driver.
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US$4.19
This tiny DC Motor in Micro Servo Body is an interesting motor - it's the same size and shape as our micro servo but it isn't a servo. It's more like a DC motor + plastic gear-train in a box. It's not a super powerful motor, it would do well as a little robot wheel. It's also a lot less expensive than a micro servo (continuous or non-continuous) because there is no control board inside.
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US$36.33
These stepper motors, in particular, are used with the Shapoko CNC machine and offer 125 oz.in of torque and 200 steps per revolution. Additionally, each motor has been equipped with extra long 600mm AWG22 wires, making them ideal for CNC applications.
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US$5.41
This is a full-featured motor shield that will be able to power many simple to medium-complexity projects. Specifications: 2 connections for 5V 'hobby' servos connected to the Arduino's high-resolution dedicated timer. 4 H-Bridges: L293D chipset provides 0.6A per bridge (1.2A peak) with thermal shutdown protection, internal kickback protection diodes. Can run motors on 4.5VDC to 25VDC.
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US$20.72
Features: Four 5VDC Omron solid state relays. Rated: 240VAC / 2A. Output fused at 2A. Relay Power: +5VDC.
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US$12.51
Features: Two 5VDC Omron solid state relays. Rated: 240VAC / 2A. Output fused at 2A. Relay Power: +5VDC.
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US$18.15
This kit comes preloaded with a HC-SR04 ultrasonic rangefinder, a tower pro SG92R servo and four wire DuPont female to female cable for connecting straight to your microcontroller of choice. This entire unit is held together by a beautiful and transparent acrylic frame, it has three holes to be mounted onto any surface you choose for your robotic application needs.
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US$4.19
The Waveshare 3678 8 Push Buttons module provides 8 single push buttons in a small board.
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US$6.29

By using particular IO scanning detection, the 5 IO Keypad takes only 5 IOs to control all of the onboard push buttons and joystick. 10 push buttons, 1 joystick (five positions), 5-bit interface.

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US$2.09
This electromagnetic transducer is a compact way to add sound to your embedded project: just supply it with a PWM signal at 3 V to 7 V and it will produce sound at the frequency of the supplied signal from an opening on the side.
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