2 layers99.4 × 99.3 mm
IoT2526 HK2
Chethien1912/IoT-Environmental-Monitoring-System
ESP32-based IoT environmental monitoring project semester 2 2025-2026 HCMUTE
78 partsMIT
2 layers100 × 100 mm
Smart air
meeTeam05/smart-air1Devices provision over BLE, publish telemetry/shadow over MQTT, and serve the app through a Cloudflare-fronted Fastify API. See Features below for the full breakdown.
- Size
- 100 × 100 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 70
- Nets
- 74
- Pads
- 224
- Tracks, vias
- 153, 626
- Pours
- 10
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 13 Mar 2026
- Updated
- 22 Aug 2026
Overview
Smart air is an open-source printed circuit board by meeTeam05, from the meeTeam05/smart-air repository on GitHub, published under the MIT licence. It is a 2-layer board of 100 × 100 mm with 70 parts on 74 nets, routed with 153 tracks and 626 vias.
It is built around the ESP32-S3-DEVKITC-1-N8, EL357N-G and AMS1117, with the SI2300, BAT54C and BZT52C5V1 among its other parts. Its parts include 19 resistors, 11 capacitors, 10 diodes, 7 ICs and 5 connectors. It belongs with the ESP32 boards of this library.
Main components
7
ESP32-S3-DEVKITC-1-N8
-- WiFi Modules ROHSEspressif SystemsWiFi ModulesEL357N-G
SOP-4_L4.4-W4.1-P2.54-LS7.0SOP-4-2.54mm New Arrivals ROHSEverlight ElectronicsUncategorised
AMS1117
1.0 A Low-Dropout Fixed RegulatorAdvanced Monolithic SystemsUncategorised
SI2300
SOT-23MOSFETsALJBAT54C
SOT-231 Pair Common Cathode 200mA 2uA@25V 30V 600mA 800mV@100mA SOT-23 Schottky Diodes ROHSNexperiaSchottky Diodes
BZT52C5V1
SOD-1231 Independent 130Ω 2uA 4.85V~5.36V 5.1V 500mW SOD-123 Zener Diodes ROHSMDDZener Diodes
CR1220-2
--40~80℃ Battery base CR1220 Phosphor bronze - Battery holder base ROHSQ&JButton And Strip Battery Connector
README
README.mdsmart-air
smart-airis an ESP32-S3 indoor air quality monitor and smart home controller. It combines ESP-IDF firmware, a Fastify + EMQX + TimescaleDB server stack, and a Flutter mobile app to solve device onboarding, telemetry ingestion, remote control, and live state sync in one system.
Introduction
Devices provision over BLE, publish telemetry/shadow over MQTT, and serve the app through a Cloudflare-fronted Fastify API. See Features below for the full breakdown. See the Hardware section for the board, sensors, and enclosure.
Features
- Firmware (ESP-IDF v5.4.2): BLE provisioning, Wi-Fi, MQTT over TLS/WSS, HTTPS OTA with rollback/validation, SHT3x (temperature/humidity), GM702B (CO) and GM102B (NO₂) gas sensors, DS3231 RTC with SNTP sync, LVGL on ILI9225 display, 3 relay channels (Fan/Lamp/Filter) with NVS persistence, WS2812 status LED, buzzer, and factory-reset button.
- Server: Fastify API with PostgreSQL/TimescaleDB, Redis, and EMQX in Docker Compose; Nginx + Cloudflare Tunnel for public ingress; per-device MQTT credentials provisioned through the API; OTA artifact hosting.
- Realtime: Live device status, shadow, telemetry, OTA progress, and command updates over Server-Sent Events; REST remains canonical for snapshots, history, replay, and command authorization.
- App (Flutter + Riverpod): JWT auth with refresh-token rotation in secure storage, 5-step BLE provisioning, multi-home/room management with member invites, device dashboard with relay and device-mode controls, real-time sparkline charts, command history, sensor calibration wizard, OTA screen, in-app notifications, and adaptive light/dark theme.
Hardware
Schematic
PCB Layout
3D Model
Assembly
Firmware
Config and build
Runtime
App
Demo
Contributing
- For structural work, also read
docs/ARCHITECTURE.md,docs/MQTT_PROTOCOL.md, anddocs/API_REFERENCE.md. - Keep changes narrow, update matching docs when contracts change, and run the narrowest verification for the area you touched.
License
MIT. See LICENSE.md.
Parts
70| Qty | Value | Footprint | References |
|---|---|---|---|
| 10 | 10K | IVS_FOOTPRINTS:R_0603 | R1, R2, R6, R7, R9, R11, R14, R16, R18, R19 |
| 5 | 100nF | IVS_FOOTPRINTS:C_0603 | C3, C4, C7, C10, C11 |
| 5 | 10K/0603/1% | IVS_FOOTPRINTS:R_0603 | R5, R10, R13, R15, R17 |
| 5 | 1uF | IVS_FOOTPRINTS:C_0603 | C2, C5, C6, C8, C9 |
| 4 | LED | IVS_FOOTPRINTS:LED_0603_1608Metric | D3, D5, D7, D10 |
| 4 | SI2300 | Package_TO_SOT_SMD:SOT-23 | Q1, Q2, Q3, Q4 |
| 3 | 1N4007 | Diode_SMD:D_SOD-123F | D1, D6, D9 |
| 3 | EL357N-G | MY_FOOTPRINT:OPTO_EL357N-G | U2, U4, U5 |
| 3 | G5NB | Relay_THT:Relay_SPST_Omron_G5NB | K1, K2, K3 |
| 2 | 4.7K | IVS_FOOTPRINTS:R_0603 | R20, R21 |
| 1 | 10uF | IVS_FOOTPRINTS:C_0603 | C1 |
| 1 | 1K | IVS_FOOTPRINTS:R_0603 | R8 |
| 1 | 1K/0603/1% | IVS_FOOTPRINTS:R_0603 | R12 |
| 1 | AMS1117 | IVS_FOOTPRINTS:SOT233 | U1 |
| 1 | BAT54C | IVS_FOOTPRINTS:SOT23-3 | D8 |
| 1 | BZT52C5V1 | Diode_SMD:D_SOD-123F | D11 |
| 1 | Buzzer | IVS_FOOTPRINTS:Buzzer-THT-12x9.5_RM7.6 | BZ1 |
| 1 | CO | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | J3 |
| 1 | CR1220 | IVS_FOOTPRINTS:BatteryHolder-SMD-CR1220 | BT1 |
| 1 | Conn_Jack-DC | IVS_FOOTPRINTS:BarrelJackDC-Horz-THT-5mm | J2 |
| 1 | ESP32-S3-DevKitC | MY_FOOTPRINT:ESP32-S3-DevKitC | U6 |
| 1 | LED | LED_SMD:LED_0603_1608Metric | D2 |
| 1 | LOGO | MY_FOOTPRINT:Warning | G*** |
| 1 | LOGO | MY_FOOTPRINT:HCMUTE | G*** |
| 1 | NO2 | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | J4 |
| 1 | RTC_DS3231M | Package_SO:SOIC-16W_7.5x10.3mm_P1.27mm | IC1 |
| 1 | R_Potentiometer | Potentiometer_THT:Potentiometer_Bourns_3266Y_Vertical | RV1 |
| 1 | SHT31 | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J5 |
| 1 | Screw_Terminal_01x04 | MY_FOOTPRINT:HB9500-4P | J1 |
| 1 | ~ | MY_FOOTPRINT:TFT-ILI9225 | U3 |
The 64 most common of 70 parts.
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Questions
How big is the Smart air PCB?
It measures 100 × 100 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Smart air use?
70 parts, built around the ESP32-S3-DEVKITC-1-N8, EL357N-G, AMS1117 and SI2300. 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.
Where can I download the Smart air KiCad files?
From the meeTeam05/smart-air repository on GitHub, at the commit this page was made from: the board is hardware/Smart-Air.kicad_pcb and its schematic hardware/Smart-Air.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Smart air design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).