ET-A15
Rotary Encoder Breakout
EC11 encoder with push switch and hardware debounce
AED 15.00
Out of stockOverview
EC11 encoder with push switch and hardware debounce
The ET-A15 is built around the ALPS EC11 — 18 detents / 9 pulses per rev, quadrature, push switch. It talks over 3 GPIO (interrupt-capable recommended).
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- Menu navigation
- Volume and value knobs
- CNC jog wheels
Key features
What makes it different
Encoder
ALPS EC11: 18 detents / 9 pulses per rev, quadrature, push switch
Conditioning
10k pull-ups + 10k/10nF RC on A, B, SW — no software debounce needed
Interface
3 GPIO (interrupt-capable recommended)
Libraries
PaulStoffregen Encoder, ESPHome rotary_encoder
Open documentation
Schematic, BOM and layout notes published for every board.
Breadboard friendly
Standard 2.54 mm pitch and M2.5 mounting holes.
Specifications
Technical specifications
| Encoder | ALPS EC11: 18 detents / 9 pulses per rev, quadrature, push switch |
|---|---|
| Conditioning | 10k pull-ups + 10k/10nF RC on A, B, SW — no software debounce needed |
| Interface | 3 GPIO (interrupt-capable recommended) |
| Size | 25.4 × 25.4 mm |
|---|---|
| Mounting | 4 × M2.5 holes, 2.54 mm from each corner |
| Connectors | 5-pin 2.54 mm header |
| Main IC | EC11E09244BS (LCSC C470742) |
| Revision | Rev A |
| Libraries | PaulStoffregen Encoder, ESPHome rotary_encoder |
|---|
Performance
Resolution
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VIN | Power | 3.3–5V (pull-up voltage) |
| 2 | GND | Ground | Ground |
| 3 | A | Signal | Channel A |
| 4 | B | Signal | Channel B |
| 5 | SW | Control | Push, active low |
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-A15 Rotary Encoder Breakout (assembled)
- 1 × 5-pin 2.54 mm male header, unsoldered
Getting started
- Wire the header: VIN, GND, A, B, SW
- Libraries: PaulStoffregen Encoder, ESPHome
rotary_encoder
Compare
Which input board?
| Rotary Encoder Breakout (this board)This board | ET-A20 4-Button Pad | ET-A18 16-Channel Analog Multiplexer | |
|---|---|---|---|
| What it does | EC11 encoder with push switch and hardware debounce | Four debounced tactile buttons in a D-pad layout | Read 16 analog or digital signals with one pin |
| Interface | 3 GPIO (interrupt-capable recommended) | — | — |
| Best for | Menu navigation | Menus and games | Many potentiometers or sensors |
| Price | 15 AED | 9 AED | 17 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.