Choosing the Right Encoder: A Four-Way Look
In the sensors, encoders, and machine-safety corner of industrial automation, buying a rotary encoder is not a one-size-fits-all decision. The four devices here range from a bare $16.95 shafted quadrature encoder to a complete $94.72 rolling-wheel length meter. Are you wiring a 5V logic circuit? Replacing a knob on a radio? Stocking a few compact encoder modules for prototyping? Or measuring a long roll of cloth or tubing on a production floor? The right choice depends on which of those problems you are solving.
Quick Take
For control-circuit work, the Oak / Grigsby 91Q128 stands out with its pulse rate and sealed construction. For a radio or panel knob, the EC11 is a compact single-part choice. For projects that need more than one encoder, the EC11EBB24C03 is a knob-style option. And for measuring rolled material, the CNCEST is a complete meter with relay outputs.
Price Comparison
The table below shows the listed prices at a glance, from a bare shafted encoder to a full measuring tool.
| Product | Listed Price | Price Bar | What It Does |
|---|---|---|---|
| Oak / Grigsby 91Q128 Rotary Encoder | $16.95 | Shafted incremental encoder for TTL projects | |
| Dual Axis EC11EBB24C03 Rotary Encoder | $29.99 | Encoder with switch | |
| CNCEST Rolling Wheel Distance Counter | $94.72 | Rolling-wheel digital meter for length measurement | |
| 5-Pin EC11 Split Shaft Rotary Encoder | $21.00 | Panel-style rotary encoder |
Decision Matrix
| If your project calls for... | Pick... | Why... |
|---|---|---|
| A shafted encoder for a logic or control circuit | Oak / Grigsby 91Q128 | 128 pulses/rev at the lowest listed price |
| A compact single-part encoder for a radio or panel | 5-Pin EC11 Split Shaft | Uses a compact single-unit format for radio and panel duty |
| Multiple compact encoder modules for prototyping | EC11EBB24C03 | Quantity choices cover 2, 4, 6, or 10 pieces |
| A tool for measuring long rolls or lengths | CNCEST digital length meter | Combines the digital display and measurement range in one unit |
Product Notes
Oak / Grigsby Rotary Encoder - 128 Pulse/Rev - 91Q128 - 2 CH Full Quadrature
The Oak / Grigsby 91Q128 is a new-old-stock incremental encoder with a 1-inch square sealed housing and a stainless steel shaft. Its big selling point is the resolution: 128 pulses per revolution, with full quadrature giving 512 total state changes per turn. It runs on a 5V DC supply and puts out 2-bit gray code with channel A leading channel B in clockwise rotation, so it works with TTL logic circuits. A 4-inch lead set with bare wire ends and mounting hardware included makes wiring straightforward, though you will need to match the leads to your own connector. The sealed sleeve bearing is a nice touch for dustier panels. As the lowest-priced unit here, it is an easy entry point, but it is a bare encoder rather than a ready-to-read display or a knob assembly.
2/4/6/10PCS Dual Axis Rotary Encoder With Switch 30 Positioning Number 15 Pulse
This dual-axis encoder uses a metal body with a green/silver finish and an 8mm base height. The model number EC11EBB24C03 points to a 30-position knob-style part with a switch and a 15-pulse output. It is available in 2, 4, 6, or 10-piece quantities, so it suits projects where you need more than one encoder or need spares. Current draw is 10mA. You get a knob-style component with a switch and dual-axis format, but the shaft style, exact label printing, and finish can vary from batch to batch, and the part must match your PCB layout and shaft requirements. It is a component-level option rather than a finished front-panel control.
Electronic Digital Length Meter Rotary Encoder Rolling Wheel Distance Counter US
CNCEST's rolling-wheel counter is a complete measuring tool rather than a bare encoder. It pairs a rotary encoder with a wheel and a black digital display, and it measures in feet, inches, meters, or yards. The counting range runs up to 999,999m / 3,280,837ft, which is long enough for fabric rolls, tubing, cable, or similar production lengths. The meter includes two relay outputs so it can independently control alarms, motors, cutters, solenoid valves, or other devices. It weighs about 2.65 lbs and uses a plastic, aluminum-alloy, and rubber build. It is the highest-priced option here, and it is not meant for mounting in a small panel or replacing a knob. You are paying for the integrated counter, relay outputs, and rolling-wheel mechanism.
One 5PIN EC11 30 Position Rotary Encoder With Push Switch Split Shaft
This 5-pin EC11 rotary encoder uses a split shaft and a push switch, which makes it a common choice for radio front ends, menu knobs, and other panel controls where you push to select and rotate to change settings. It offers 30 positions, and the shaft length is 12.5mm. It sits near the lower end of the price spread, and its single-unit format makes it a reasonable replacement part. The split shaft works with knobs that grip the shaft, but the 5-pin wiring and 12.5mm shaft must fit your radio or device. It is switch hardware with a rotary switch style, so treat it as a component rather than a complete encoder module with mounting bracket.
Final Recommendation by Use Case
- For a control-circuit project, the Oak / Grigsby 91Q128 is the direct choice, with full quadrature output and a sealed housing.
- For a radio or panel knob replacement, the EC11 is the practical pick because it adds a push switch without turning into a bulky assembly.
- For prototype runs or multiple control panels, the EC11EBB24C03 is the one to buy when you want matching spare modules.
- For cloth, tube, cable, or other long-length measurement, the CNCEST digital length meter is the complete solution, with its digital display and measurement range in one tool.
