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Bourns Absolute Encoder (EAW0J-B24-AE0128L)
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Price: $14.09
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Sparkfun Item #: COM-15036 -

The Bourns Absolute Encoder is a digital control knob that provides 128 unique results evenly spaced around a full circle. It is designed as a control panel knob but can be adapted for other uses. This can be a good alternative to using a potentiometer and analog pin, as this allows for full-turn and multi-turn operation. It differs from the more common incremental rotary encoder which has only two or four values in a rotation and is designed to measure full rotations and direction. This...

Rotary Encoder
Price: $7.98
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Sparkfun Item #: COM-09117 -

This is a 12-step rotary encoder with a nice 'clicking' feel. It's breadboard friendly, and has a pretty handy select switch (by pushing in on the knob). The encoder is different from a potentiometer in that an encoder has full rotation without limits. The unit outputs gray code so that you can tell how much and in which direction the encoder has been turned. This unit does not come with a knob, but a working knob is related below. Documents: Bildr example showing how to use an encoder in...

Rotary Encoder - 1024 P/R (Quadrature)
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Price: $87.10
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Sparkfun Item #: COM-11102 -

This 1024 pulse per rotation rotary encoder outputs gray code which you can interpret using a microcontroller and find out which direction the shaft is turning and by how much. This allows you to add feedback to motor control systems. Encoders of this kind are often used in balancing robots and dead reckoning navigation but it could also be used as a very precise input knob. Features: Resolution: 1024 Pulse/Rotation Input Voltage: 5 - 12VDC Maximum Rotating Speed: 6000rpm Allowable Radial...

Rotary Encoder - 200 P/R
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Price: $57.61
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Sparkfun Item #: COM-10790 -

This 200 pulse per rotation single-output encoder outputs electrical pulses which you can interpret using a microcontroller to find the position of the input shaft. This allows you to add feedback to motor control systems. Encoders of this kind are often used in balancing robots and dead reckoning navigation. The encoder comes with a set screw coupler which will attach to any 4mm shaft. Features: Resolution: 200 Pulse/Rotation Input Voltage: 5 - 12VDC Maximum Rotating Speed: 5000rpm Allowable...

Rotary Encoder - 200 P/R (Quadrature)
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Price: $86.99
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Sparkfun Item #: COM-10932 -

This 200 pulse per rotation rotary encoder outputs gray code which you can interpret using a microcontroller and find out which direction the shaft is turning and by how much. This allows you to add feedback to motor control systems. Encoders of this kind are often used in balancing robots and dead reckoning navigation but it could also be used as a very precise input knob. The encoder comes with a set screw coupler which will attach to any 4mm shaft. Features: Resolution: 200...

Rotary Encoder - Illuminated (Red/Green)
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Price: $5.32
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Sparkfun Item #: COM-15140 -

Rotary encoders are used similarly to potentiometers. They're different from potentiometers in that an encoder has full rotation without limits. They output gray code so that you can tell how much and in which direction the encoder has been turned. This encoder is especially cool because it has a red/green LED built in, as well as a push-button. This version has an updated material that is heat resistant and slightly changed dimensions, but should still work well with our rotary encoder...

Rotary Encoder - Illuminated (RGB)
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Price: $9.36
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Sparkfun Item #: COM-15141 -

Rotary encoders can be used similarly to potentiometers. The difference being that an encoder has full rotation without limits (It just goes round and round). They output gray code so that you can tell how much and in which direction the encoder has been turned. They're great for navigating menu screens and things like that. This encoder is especially cool because it has a common anode RGB LED built in, as well as a push-button. This version has an updated material that is heat resistant and...