Open-Air-Foundation/pcb-one1AirGradient ONE is a desktop indoor air quality monitor built around an ESP32-C3 module. It measures particulate matter (Plantower PMS5003), CO₂ (Senseair S8), temperature and humidity (SHT4x), and VOC (SGP41), with…
Ag diy pro is an open-source printed circuit board by Open-Air-Foundation, from the Open-Air-Foundation/pcb-one repository on GitHub, published under the CC-BY-SA-4.0 licence. It is a 2-layer board of 124.1 × 112 mm with 65 parts on 54 nets, routed with 588 tracks and 145 vias.
It is built around the ESP32-C3-MINI-1-N4, TPL5010EVM and LM1117-3.3, with the 918-418K2022Y40000 among its other parts. Its parts include 18 capacitors, 10 resistors, 7 connectors, 4 ICs and 1 fuse. It belongs with the lEDs and displays boards and the ESP32 and RISC-V boards of this library.
KiCad hardware design files for the AirGradient ONE, a mains-powered indoor air quality monitor.
AirGradient ONE is a desktop indoor air quality monitor built around an ESP32-C3 module. It measures particulate matter (Plantower PMS5003), CO₂ (Senseair S8), temperature and humidity (SHT4x), and VOC (SGP41), with readings shown on an I²C OLED display and an 11-segment RGB LED bar that gives an at-a-glance air quality indication. The board is powered and flashed over USB-C, and exposes I²C, general-purpose I/O and RS485/Modbus headers for expansion.
Sensors and the display are carried on pluggable modules rather than being reflowed onto the main board — the main board provides the sockets, power rails, and the hardware watchdog around them.
This repository contains the complete electronics design: schematics, PCB layouts, component libraries, and production outputs for both boards.
| Board | Directory | KiCad project | Size | Layers | Description |
|---|---|---|---|---|---|
| Main board | PCB/airgradient-one-indoor/ | ag-diy-pro (rev 9) | 124.1 × 112.0 mm | 2 (1.6 mm) | ESP32-C3, USB-C power, watchdog, sensor/display sockets, expansion headers |
| 11-dot LED bar | PCB/11-dot-led-bar/ | leds_bar | 100.0 × 12.0 mm | 2 (0.8 mm) | 11 × WS2812B addressable RGB LEDs; mounts to the main board as the air quality indicator |
| Function | Part | Ref |
|---|---|---|
| MCU / Wi-Fi | ESP32-C3-MINI-1-N4 | U6 |
| Hardware watchdog | TPL5010 | U2 |
| 3.3 V LDO | LM1117-3.3 (AMS1117-3.3 alternative) | U4 |
| LED bar | 11-dot WS2812B bar (see PCB/11-dot-led-bar/) | U5 |
| USB-C connector | 918-418K2022Y40000 | USB1 |
| Input fuse | 1 A / 16 V, 1206 | F1 |
| Reset / Boot buttons | PTS525SM08SMTR2LFS | Reset1, Boot1 |
| CO₂ sensor | Senseair S8 | S*2 |
| VOC sensor socket | BME680 module, 1×6 header | S*1 |
| Temperature/humidity socket | SHT4x module, 1×4 header | SHT1 |
| OLED display socket | I²C, 1×4 header | OLED1 |
| PM sensor connector | PMS5003, 8-pin 1.25 mm | PM2 |
| I²C expansion | 3 × 1×4 header | I2C1–I2C3 |
| GPIO expansion | 8-pin 1.25 mm | IO1 |
| RS485 / Modbus | 4-pos screw terminal | RS1 |
20240108); schematics are in the
KiCad 7 format (20230121) and migrate on open. The 11-dot LED bar is still in the KiCad 7 layout
format (20221018).fp-lib-table / sym-lib-table, so the projects open without extra library setup.PCB/
├── airgradient-one-indoor/ # Main PCB
│ ├── ag-diy-pro.kicad_* # schematic, layout, project
│ ├── Libs/ # symbols, footprints, 3D models
│ └── production/
│ └── gerber/ # Gerbers, drill files, fabrication zip
└── 11-dot-led-bar/ # LED indicator PCB
├── leds_bar.kicad_* # schematic, layout, project
├── libs/ # symbols and footprints
├── doc/ # footprint and STEP model for board-to-board mounting
└── production/
├── Gerber/ # Gerbers, drill files, fabrication zip
└── BOM/ # BOM and pick-and-place positionsEach board ships a ready-to-order Gerber set:
| Board | Production files | Stackup |
|---|---|---|
| Main board | PCB/airgradient-one-indoor/production/gerber/ag-diy-pro.zip | 2-layer, 1.6 mm |
| 11-dot LED bar | PCB/11-dot-led-bar/production/Gerber/gerber_ledbar.zip | 2-layer, 0.8 mm |
Both zips contain the copper, soldermask, silkscreen, paste and edge-cut layers plus PTH/NPTH drill files, in the format accepted by JLCPCB and most other fabricators.
The 11-dot LED bar has a grouped BOM (production/BOM/BOM.xls and production/BOM/leds_bar.csv)
and pick-and-place positions (production/BOM/leds_bar-all-pos.csv) for assembly.
The main board BOM is not currently exported to this repository — component values and designators
can be read from ag-diy-pro.kicad_sch.
The main board schematic is at revision 9. Hardware revisions are tagged on this repository; per-version release notes and the matching production file set are published on the GitHub Releases page.
This is open-source hardware. The design files in this repository are licensed under the Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) license — see LICENSE.
You are free to use, modify, and manufacture these designs, including commercially, provided you credit AirGradient and share derivative designs under the same license.
AirGradient hardware team.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 0.1uf | Capacitor_SMD:C_0603_1608Metric | C2, C3, C4, C6, C8, C10, C12, C13, C14, C15, C17, C18 |
| 7 | Conn_01x04 | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | Con1, Con2, I2C1, I2C2, I2C3, OLED1, SHT1 |
| 5 | 10K | Resistor_SMD:R_0603_1608Metric | R9, R10, R11, R12, R13 |
| 2 | 0.01uf | Capacitor_SMD:C_0603_1608Metric | C1, C9 |
| 2 | 100K | Resistor_SMD:R_0603_1608Metric | R4, R8 |
| 2 | 22uf / 10V | Capacitor_SMD:C_0603_1608Metric | C11, C16 |
| 2 | 5.1K | Resistor_SMD:R_0603_1608Metric | R6, R7 |
| 2 | Conn_01x08_MountingPin | Connector_Molex:Molex_PicoBlade_53261-0871_1x08-1MP_P1.25mm_Horizontal | IO1, PM2 |
| 2 | SW_Push_Dual | AG-PRO-Library:PTS525SM08SMTR2LFS | Boot1, Reset1 |
| 1 | 10uf / 25V | Capacitor_SMD:C_0603_1608Metric | C7 |
| 1 | 1A 16V | Fuse:Fuse_1206_3216Metric | F1 |
| 1 | 1uf | Capacitor_SMD:C_0603_1608Metric | C5 |
| 1 | 51K | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | 918-418K2022Y40000 | AG-PRO-Library:918-418K2022Y40000 | USB1 |
| 1 | BME | Connector_PinSocket_2.54mm:PinSocket_1x06_P2.54mm_Vertical | S*1 |
| 1 | Co2-S8 | AG-PRO-Library:Co2-S8 | S*2 |
| 1 | ESP32-C3-MINI-1-N4 | AG-PRO-Library:XCVR_ESP32-C3-MINI-1-N4 | U6 |
| 1 | LM1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U4 |
| 1 | LOGO | AG-PRO-Library:Logo | G*** |
| 1 | Screw_Terminal_01x04 | AG-PRO-Library:Modbus_2.5_CONN | RS1 |
| 1 | TPL5010 | Package_TO_SOT_SMD:SOT-23-6 | U2 |
| 1 | ~ | AG-PRO-Library:11Dots_LedBar | U5 |
The 49 most common of 65 parts.
Open-Air-Foundation/pcb-openair-main
The Open Air main board carries the monitor's ESP32-C3 MCU, USB-C power input with a 3.3 V LDO, a TPL5010 hardware watchdog, status LEDs and a push button, and the Molex connectors the plug-in sensor modules attach to.
snorkman88/suntastic
An ultra low-power management board for IoT devices
christopher-besch/mold_detect
Warn residents of mold-friendly atmosphere and log opened windows.
It measures 124.1 × 112 mm and has 2 copper layers, 1.6 mm thick.
65 parts, built around the ESP32-C3-MINI-1-N4, TPL5010EVM, LM1117-3.3 and 918-418K2022Y40000. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the Open-Air-Foundation/pcb-one repository on GitHub, at the commit this page was made from: the board is PCB/airgradient-one-main/ag-diy-pro.kicad_pcb and its schematic PCB/airgradient-one-main/ag-diy-pro.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Its repository publishes it under the CC-BY-SA-4.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).