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Image of the Atmega324p

Atmega324P

$8.50
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USB AVR programmer

USB AVR Programmer

$9.95
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Breadboard adapter for the USBasp AVR Programmer

USBasp Breadboard Breakout Adapter

$4.90
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ST Link v2 for STM32 and STM8 microcontrollers top view of all components

ST-Link v2 STM32 and STM8 Programmer

$9.95
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STM32F0 microcontroller and interface board top view

STM32 M0 MCU and Interface to Breadboard

$14.95
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Multimeter Security Banana Plug To Test Hook Clip Probe Lead Cable 500V

Multimeter Security Banana Plug To Test Hook Clip Probe Lead Cable 500V

$8.99
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3 Foot USB Cable Type A to USB Cable Type A

USB Cable Type A Male to USB Type A Male - 3 FT

$2.65
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USB 2.0 Cable 10 Foot Type A Male to Type B Male

USB 2.0 Cable Type A Male to Type B Male - 10 FT

$4.80
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Tumbnail: 62 oz-in NEMA 17 Stepping motors (also called stepper motor)

NEMA 17 Stepping Motor (62 oz-in 5mm single shaft)

$19.95
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Introduction to Servos and Servomechanisms

Servos are motors that use feedback to control the motor's position. This type of control is called closed loop control. Servos use a special electromechanical device to provide this feedback. This electromechanical device can be a potentiometer or encoder. Encoders come in various shapes, sizes and resolutions.

Encoders provide a pulse (usually caused by an LED and sensor) that determines the position of the shaft of the motor. When the controller counts to the commanded number of pulses, the motor is stopped, or put into reverse if the motor over ran the position. The motor and controller will constantly provide torque in the direction that is needed to keep the position and is always correcting.

If a potentiometer is used, the motor shaft is connected to the potentiometer in some way (hobby servos connect the potentiometer with gears).

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