Learning and fast prototyping
I2C knob with button and RGB LEDs on a Grove cable — a plug-in setpoint / menu input for M5Stack-based robot controllers.
Engineering inference
M5Stack
M5Stack Unit Encoder (U135)
M5Stack U135 Unit Encoder: an I2C rotary encoder unit — 30-position pulse knob (30 pulses per turn) with push button and 2× SK6812 RGB LEDs, read by an on-board STM32F030 that reports the accumulated count over I2C (0x40) on an HY2.0-4P Grove port; 5 V at 17 mA, 32 × 24 × 25.4 mm, 7.4 g.
U135Development boardPrice$7.95shop.m5stack.com · in stock
Buy at shop.m5stack.com Overview
Motor essentials
Facts about the complete product. Unknown values remain open design questions.
A good fit for
Guidance to help you shortlist. The basis is shown for each recommendation.
No-load speed, rated performance and stall limits describe different operating points. A stall specification is not a continuous operating rating.
3D model & CAD
3D model & CAD files
Generated from the datasheet's dimensioned drawing and measured against it. Download the STEP to check fit in your own enclosure.
- Envelope (L × W × H)
- 32 × 24 × 25.4 mm
- Verification
- generated
- Envelope complete
- Yes
Signals & mounting
Signals and mounting
Resolution, output stage and the pads you wire — what the controller needs to count it.
- Sensing
- mechanical
- Type
- incremental
- Channels
- decoded on board (count over I2C)
- Output
- I2C count + button state (address 0x40)
- Supply voltage
- 5–5 V
| Pad / pin | Position | Role | Notes |
|---|---|---|---|
| GND | PORT.A-1 | ground | |
| 5V | PORT.A-2 | power in | 5 V supply |
| SDA | PORT.A-3 | data | I2C data |
| SCL | PORT.A-4 | clock | I2C clock |
CPR counts both edges of both channels on the sensed shaft; on a gearmotor multiply by the gear ratio for the output shaft.
Specifications
Motor performance
No-load, rated-load and stall figures retain their separate test conditions.
Stall torque and current are not continuous ratings. Check the duty cycle and starting load when choosing the driver and power supply.
Thermal limits by level
Product operating conditions, chip ambient ratings, package case limits and junction maxima remain separate.
Motor body
Mechanical dimensions
Reported product dimensions may exclude protruding components. Unknown height does not establish a complete clearance envelope.
- Length
- 32 mm
- Width
- 24 mm
- Reported height / thickness
- 25.4 mm
Attached generated geometry is an approximate envelope. A generated outline does not establish an electrically verified PCB footprint.
Board connectors
| ID / type | Pins | Pitch | Notes |
|---|---|---|---|
| portaHY2.0-4P Grove (PORT.A, I2C) | 4 | Unknown | — |
Complete structured record
Every available field, including details beyond the summaries. Null means the value has not been established.
Sourcing & files
Supplier offers
US / USD is the target market. Observed price and stock are separate from a delivery quote.
shop.m5stack.com
US · USD
$7.95Minimum quantity unknown
- Observed stock
- in stock
- Checked
- Oct 1, 2026, 12:32 PM UTC
- Delivery estimate
- Not quoted
Observed within the last 24 hours. Confirm the current supplier quote.
Visit supplier (opens in a new tab)Delivery depends on quantity, postal code and shipping method. A dispatch statement such as “ship today” is not an arrival estimate.
Design files and references
Each source keeps its own verification status. Confirm the part revision and file contents before using it in a design.
Datasheet (opens in a new tab)
Manufacturer reference
M5Stack Unit Encoder (U135) — product photo (opens in a new tab)
Manufacturer reference
store og:image
STEP (generated from datasheet drawing) — link unavailable
Generated asset
cad_check passed
Generated envelope geometry may also exist for this record. It does not replace manufacturer CAD or a verified electrical land pattern.
Source evidence
Document provenance, retrieval dates and the field groups supported by each source.
Supports: spec.constraints.electrical.supply_voltage_max_v, spec.constraints.electrical.supply_voltage_min_v, spec.geometry.cad.bbox.height_mm, spec.geometry.cad.bbox.length_mm, spec.geometry.cad.bbox.width_mm, spec.geometry.cad.envelope_complete, spec.geometry.cad.mesh_path, spec.geometry.cad.step_path, spec.geometry.cad.verification, spec.geometry.dimensions.height_mm, spec.geometry.dimensions.length_mm, spec.geometry.dimensions.width_mm, spec.geometry.other.weight_g, spec.provides.channels, spec.provides.encoder_type, spec.provides.features, spec.provides.index_channel, spec.provides.interface, spec.provides.output_type, spec.provides.resolution_ppr, spec.provides.sensing, spec.usage.connectors, spec.usage.pinout, spec.usage.pinout_complete, spec.usage.requirements.other.supply_current_ma
sha256 20c47fc12f52692ace3329fd4a9e17eb48b96bc152bca7ec842a43ad26bdb9ef
Supports: offers
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FAQ
M5Stack Unit Encoder (U135) questions
What voltage powers the M5Stack Unit Encoder (U135)?
Supply range 5–5 V.
How much does the M5Stack Unit Encoder (U135) cost?
From $7.95 at shop.m5stack.com. Prices are observed unit prices before tax and shipping.
What are the M5Stack Unit Encoder (U135) dimensions?
32 × 24 × 25.4 mm. A STEP model is available for enclosure fit checks.
Where does this M5Stack Unit Encoder (U135) data come from?
Every value in this record is traced to a source — 2 documents including the board and chip datasheets — with the page and table cited per value. Unknowns are left explicit, never guessed.