Sensor modules

AXS-044 — PMS5003 particulate-matter carrier PMOD module

Catalog #44 in the AruviX sensor line, level L3 (UART, fixed binary frames).

Level L3 ERC clean DRC clean Fab package 8 components

3D render of the AXS-044 PCB — Rendered from the PCB layout. No physical board has been manufactured.

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`	100nF 16V X7R	PMS5003 supply decoupling at the header	`GRM188R71C104KA01D` Murata	`C_0603_1608Metric`
`C2`	10uF 10V X5R	Fan start-up bulk reservoir on the 5 V feed	`GRM21BR61A106KE19L` Murata	`C_0805_2012Metric`
`J1`	PMOD PLUG 2x6	PMOD peripheral plug (Digilent spec 1.2)	not selected generic	`PinHeader_2x06_P2.54mm_Horizontal`
`J2`	PMS5003 (2x5 1.27mm)	PMS5003 header, pad N = sensor pin N: 1/2 VCC(5V), 3/4 GND, 5 RESET, 7 RX, 9 TX, 10 SET	not selected generic Datasheet ↗	`PinHeader_2x05_P1.27mm_Horizontal`
`J3`	EXT 5V IN	External 5 V for the PMS5003: 1 +5V, 2 GND (common with PMOD GND)	not selected Phoenix Contact	`TerminalBlock_Phoenix_MKDS-1,5-2-5.08_1x02_P5.08mm_Horizontal`
`R1`	100R	Series protection on the sensor-driven UART TX line (3.3 V logic)	`RC0603FR-07100RL` Yageo Datasheet ↗	`R_0603_1608Metric`
`R2`	10k	SET pull-up: sensor runs (normal mode) when the host leaves pin 1 alone	`RC0603FR-0710KL` Yageo Datasheet ↗	`R_0603_1608Metric`
`R3`	10k	RESET pull-up: sensor out of reset when the host leaves pin 7 alone	`RC0603FR-0710KL` Yageo Datasheet ↗	`R_0603_1608Metric`

Signals#

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

3V3 EXT_5V GND PM_RESET_N PM_SET PM_TX RXD TXD

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-044-particulate

Catalog #44 in the AruviX sensor line (../README.md), level L3 (UART, fixed binary frames).

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

What it teaches#

Air-quality sensing over a fixed-format binary UART: the PMS5003 streams 32-byte frames (start 0x42 0x4D, PM1.0/PM2.5/PM10 in two calibrations, particle-count bins, 16-bit checksum) at 9600 baud. Plus power-mode control: SET (sleep) and RESET are host GPIOs on this carrier.

The 5 V requirement (read this first)#

The PMS5003 is 5 V-powered — its internal fan needs 5 V and draws roughly 100 mA. Like AXS-024, this carrier takes external 5 V on the J3 screw terminal (EXT_5V net) with its ground common to the PMOD ground plane. The sensor's UART/SET/RESET logic is 3.3 V (internally regulated), so the signal lines go to the PMOD directly. Never feed 5 V into any PMOD pin.

J2 pin-numbering warning#

The PMS5003 mates through a 1.27 mm 2×5 connector on its supplied cable. J2 is wired so that KiCad pad N = PMS5003 connector pin N:

PMS pin	1	2	3	4	5	6	7	8	9	10
Function	VCC 5V	VCC	GND	GND	RESET	NC	RX	NC	TX	SET

The generic KiCad 2×5 header footprint numbers pads odd/even by row, which happens to place pin 1/2 at the same end as the Plantower drawing — but the mating orientation depends on the shrouded header and cable used. Flagged for verification before fab: confirm pad-N-to-pin-N against the physical connector, cable, and a purchased PMS5003.

Design#

100 Ω series (R1) on the sensor-driven TX line.
SET and RESET pulled up to 3V3 with 10 k on-module (sensor runs and stays out of reset if the host leaves pins 1/7 unconfigured); both are optionally host-driven on PMOD pins 1 (PM_SET) and 7 (PM_RESET_N).
100 nF + 10 µF on the EXT_5V feed (fan start-up).
PMOD Type 3 UART + control extras.

PMOD pin	1	2	3	4	5	6	7	8	9	10	11	12
Net	PM_SET	TXD	RXD	NC	GND	3V3	PM_RESET_N	NC	NC	NC	GND	3V3

Regenerate#

python3 generate_design.py

Remaining for release#

[ ] PCB layout, DRC, fab
[ ] Pin the 1.27 mm 2×5 shrouded header and the Phoenix terminal orderable parts (MPNs are TBD:)
[ ] Verify J2 pad-to-pin mapping against a physical PMS5003 + cable
[ ] hdl/: UART RX, frame parser + checksum, sleep/wake sequencing, testbench, ECP5 demo
[ ] BOM export and availability check, design-review checklist