Sensor modules

AXS-005 — Rotary encoder PMOD module

Catalog #5 in the AruviX sensor line, level L2 (GPIO, quadrature decode + debounce). An Alps EC11E15244G1 rotary encoder (30 detents, 15 pulses/rev) with integral push switch.

Level L2 ERC clean DRC clean Fab package 10 components

3D render of the AXS-005 PCB — Rendered from the PCB layout. No physical board has been manufactured.

Circuit review & bench-test guide →

Components#

Every placed component, with the reason it is on the board. Extracted directly from the schematic, so this cannot drift from the design.

Ref	Value	What it does on this board	Part number	Footprint
`C1`	10nF 50V X7R	Light phase-A contact snubber; main debouncing is done in fabric	`GRM188R71H103KA01D` Murata	`C_0603_1608Metric`
`C2`	10nF 50V X7R	Light phase-B contact snubber; main debouncing is done in fabric	`GRM188R71H103KA01D` Murata	`C_0603_1608Metric`
`J1`	PMOD PLUG 2x6	PMOD peripheral plug (Digilent spec 1.2)	not selected generic	`PinHeader_2x06_P2.54mm_Horizontal`
`R1`	10k	Phase A pull-up	`RC0603FR-0710KL` Yageo Datasheet ↗	`R_0603_1608Metric`
`R2`	10k	Phase B pull-up	`RC0603FR-0710KL` Yageo Datasheet ↗	`R_0603_1608Metric`
`R3`	10k	Push-switch pull-up	`RC0603FR-0710KL` Yageo Datasheet ↗	`R_0603_1608Metric`
`R4`	100R	Series protection on the module-driven ENC_A line	`RC0603FR-07100RL` Yageo Datasheet ↗	`R_0603_1608Metric`
`R5`	100R	Series protection on the module-driven ENC_B line	`RC0603FR-07100RL` Yageo Datasheet ↗	`R_0603_1608Metric`
`R6`	100R	Series protection on the module-driven ENC_SW line	`RC0603FR-07100RL` Yageo Datasheet ↗	`R_0603_1608Metric`
`SW1`	EC11E15244G1	Rotary encoder, 30 detents, 15 pulses, with push switch	`EC11E15244G1` Alps Alpine Datasheet ↗	`RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm`

Signals#

Net labels used in the schematic, which are also the names the HDL top level should use.

3V3 ENC_A ENC_A_RAW ENC_B ENC_B_RAW ENC_SW ENC_SW_RAW GND

Production status#

Schematic ERC	0 violations
PCB layout	complete
DRC	0 violations
Fab package	exported (24 gerbers + drill + CPL + BOM)
Fabricated	no — design stage only

Source: boards/sensor-modules/axs-005-encoder

Catalog #5 in the AruviX sensor line (../README.md), level L2 (GPIO, quadrature decode + debounce). An Alps EC11E15244G1 rotary encoder (30 detents, 15 pulses/rev) with integral push switch.

Status: schematic generated, ERC clean (0/0), netlist reviewed. PCB layout not started. Not released.

What it teaches#

Quadrature: A leads B clockwise, B leads A counter-clockwise — build the decoder state machine, count detents, and handle the hard-bouncing shaft switch. The main debouncing is the fabric lesson: the on-board 10 nF caps on A/B are only a light snub taking the RF edge off the contacts; synchronizers plus a debounce state machine (or counters) belong in HDL.

Design#

EC11E common pin C and switch pin S2 tie to GND; A, B, and S1 idle high through 10 kΩ pull-ups and go low as the contacts close.
All three module-driven lines pass 100 Ω series resistors.
10 nF (GRM188R71H103KA01D) from A and B to GND as contact snubbers; with the 10 k pull-up that is ~0.1 ms — deliberately not a full RC debounce.
No decoupling cap: the module carries no IC.

PMOD pin	1	2	3	4	5	6	7	8	9	10	11	12
Net	ENC_A	ENC_B	ENC_SW	NC	GND	3V3	NC	NC	NC	NC	GND	3V3

Regenerate#

python3 generate_design.py

Remaining for release#

[ ] PCB layout (20 × 25 mm outline, knob clearance), DRC, fab outputs
[ ] hdl/: synchronizer + debouncer + quadrature decoder, testbench, demo
[ ] BOM export and availability check, design-review checklist