4 layers55 × 70 mm
Envsensor
bruvv/ENV-sensor-esp32
Custom ESP32-S3 environmental sensor PCB designed for use with ESPHome and Home Assistant.
9 partsGPL-3.0
2 layers52 × 70 mm
Envsensor
bruvv/ENV-sensor-esp32Custom ESP32-S3 environmental sensor PCB designed for use with ESPHome and Home Assistant.
- Size
- 52 × 70 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 5
- Nets
- 13
- Pads
- 71
- Tracks, vias
- 0, 0
- Routed
- Not yet
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 4 Oct 2025
- Updated
- 26 Sep 2026
Overview
Envsensor is an open-source printed circuit board by bruvv, from the bruvv/ENV-sensor-esp32 repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 52 × 70 mm with 5 parts on 13 nets.
It is built around the MS5611-01BA03 and SCD30.
Main components
2README
README.mdENV Sensor ESP32
Custom ESP32-S3 environmental sensor PCB designed for use with ESPHome and Home Assistant.
The board combines several environmental sensors, a 128×128 OLED display and an HLK-LD2450 mmWave presence sensor on a compact custom PCB.
Features
- ESP32-S3 DevKitC N16R8
- Sensirion SCD30 CO₂ sensor
- Sensirion SEN55 environmental sensor
- MS5611 barometric pressure sensor
- BH1750 ambient light sensor
- ZJY-M150 128×128 OLED with SSD1327 controller
- HLK-LD2450 mmWave presence sensor
- Shared I²C bus for environmental sensors
- SPI interface for the OLED display
- Hardware UART for the LD2450
- 5 V and 3.3 V power rails
- 4-layer PCB
- 55 × 70 mm board
- Designed in KiCad 10
Sensors
| Component | Function | Supply | Interface |
|---|---|---|---|
| ESP32-S3 DevKitC N16R8 | Main controller, Wi-Fi and Bluetooth | 5 V | - |
| Sensirion SCD30 | CO₂, temperature and humidity | 5 V | I²C |
| Sensirion SEN55 | PM1.0, PM2.5, PM4, PM10, VOC, NOx, temperature and humidity | 5 V | I²C |
| MS5611 | Barometric pressure | 3.3 V | I²C |
| BH1750 | Ambient light | 3.3 V | I²C |
| ZJY-M150 / SSD1327 | 128×128 OLED display | 3.3 V | SPI |
| HLK-LD2450 | mmWave presence and multi-target tracking | 5 V | UART |
ESP32 Pin Mapping
I²C
| Signal | ESP32-S3 |
|---|---|
| SDA | GPIO8 |
| SCL | GPIO9 |
The environmental sensors share the I²C bus.
| Sensor | I²C address |
|---|---|
| SCD30 | 0x61 |
| SEN55 | 0x69 |
| BH1750 | 0x23 |
| MS5611 | 0x77 |
The PCB contains 4.7 kΩ pull-up resistors for SDA and SCL.
SSD1327 OLED
The ZJY-M150 OLED is operated in 4-wire SPI mode.
| OLED signal | ESP32-S3 |
|---|---|
| CS | GPIO10 |
| MOSI / SDA | GPIO11 |
| CLK / SCL | GPIO12 |
| DC | GPIO13 |
| RESET | GPIO14 |
HLK-LD2450
The LD2450 uses a dedicated hardware UART.
| Signal | ESP32-S3 |
|---|---|
| LD2450 RX | GPIO17 / ESP32 TX |
| LD2450 TX | GPIO18 / ESP32 RX |
UART configuration:
- Baud rate:
256000 - Data bits:
8 - Parity: none
- Stop bits:
1
PCB
The current PCB revision is designed in KiCad 10.
| Property | Value |
|---|---|
| Dimensions | 55 × 70 mm |
| Copper layers | 4 |
| Top copper | F.Cu |
| Inner layer 1 | In1.Cu |
| Inner layer 2 | In2.Cu |
| Bottom copper | B.Cu |
The repository contains the KiCad project files as well as production Gerber and drill files.
LD2450 Connector
The HLK-LD2450 is connected through an 8-pin dual-row SMD female socket.
Required connector specification:
| Property | Requirement |
|---|---|
| Type | Female PCB socket |
| Contacts | 8 |
| Rows | 2 × 4 |
| Pitch | 2.00 mm |
| Mounting | SMD / SMT |
| Orientation | Straight |
A suitable branded connector is:
Würth Elektronik 62100821821
- 2 × 4
- 8 contacts
- 2.00 mm pitch
- Female
- SMD
For generic alternatives, search for:
2.0mm 2x4 8 pin female SMD header
SEN55 Connection
The SEN55 is mounted away from the main PCB to keep its airflow unobstructed.
The connection provides:
| Signal |
|---|
| 5 V |
| GND |
| SDA |
| SCL |
| GND / SEL |
Bill of Materials
| Qty | Component | Notes |
|---|---|---|
| 1 | ESP32-S3 DevKitC N16R8 | ESP32-S3-WROOM based |
| 1 | Sensirion SCD30 | CO₂ sensor |
| 1 | Sensirion SEN55 | Environmental and particulate sensor |
| 1 | MS5611 module | Pressure sensor |
| 1 | BH1750 module | Ambient light sensor |
| 1 | ZJY-M150 128×128 OLED | SSD1327 controller, 7-pin |
| 1 | HLK-LD2450 | mmWave presence sensor |
| 1 | 2×4 2.00 mm female SMD socket | LD2450 connector |
| 2 | 4.7 kΩ resistor | I²C pull-ups |
Design Considerations
SCD30
The SCD30 should be kept away from heat sources and strong direct airflow that could influence its temperature and CO₂ measurements.
Datasheet:
https://sensirion.com/media/documents/4EAF6AF8/61652C3C/Sensirion_CO2_Sensors_SCD30_Datasheet.pdf
SEN55
The SEN55 requires unobstructed airflow through its inlet and outlet.
For best performance:
- Keep the inlet and outlet separated.
- Avoid recirculating exhaust air into the inlet.
- Keep the sensor away from heat sources.
- Orient the sensor so dust cannot easily accumulate inside.
- Keep the fan inlet and exhaust unobstructed.
MS5611
Keep the pressure sensor away from the ESP32 voltage regulator and other heat-producing components.
BH1750
The BH1750 needs a clear optical path to the room.
Avoid placing it behind opaque enclosure material or in the shadow of other components.
Datasheet:
https://components101.com/sites/default/files/component_datasheet/BH1750.pdf
SSD1327 OLED
The display is a ZJY-M150 1.5-inch 128×128 OLED using an SSD1327 controller.
The PCB uses SPI for the display.
SSD1327 datasheet:
https://www.waveshare.com/w/upload/a/ac/SSD1327-datasheet.pdf
HLK-LD2450
The LD2450 provides mmWave presence detection and multi-target position tracking.
Placement and enclosure design can significantly affect radar performance.
Recommendations:
- Face the radar toward the room.
- Avoid metal directly in front of the antenna.
- Keep sufficient clearance around the antenna area.
- Avoid placing large copper areas or metal parts directly in the radar field of view.
Repository Structure
envsensor/
KiCad schematic, PCB project and project-specific libraries.
gerber/
Production Gerber and drill files.
datasheet/
Component documentation.
docs/
Hardware design and implementation documentation.
README.md
Project documentation.
Manufacturing
The gerber/ directory contains the generated PCB production files, including:
F.CuIn1.CuIn2.CuB.CuF.MaskB.MaskF.PasteB.PasteF.SilkscreenB.SilkscreenEdge.Cuts- PTH drill file
- NPTH drill file
The repository also contains gerber/gerber.zip, which can be uploaded to most PCB manufacturers.
Always verify the Gerbers in the PCB manufacturer's Gerber viewer before placing an order.
Software
The board is intended for use with ESPHome and Home Assistant.
Useful ESPHome documentation:
- SCD30: https://esphome.io/components/sensor/scd30/
- SEN5x: https://esphome.io/components/sensor/sen5x/
- BH1750: https://esphome.io/components/sensor/bh1750/
- MS5611: https://esphome.io/components/sensor/ms5611/
- SSD1327: https://esphome.io/components/display/ssd1327/
- LD2450: https://esphome.io/components/sensor/ld2450/
License
See LICENSE.
Parts
5| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | BH1750 | Library:Untitled_1 | U5 |
| 1 | MS5611-01BA | Library:MS5611 | U4 |
| 1 | SCD30 | kicad-libraries:SCD30 | U3 |
| 1 | ~ | ld2450:ld2450 | U1 |
| 1 | ~ | Library:esp32-s3-wroom-1-devkit | U2 |
Questions
How big is the Envsensor PCB?
It measures 52 × 70 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Envsensor use?
5 parts, built around the MS5611-01BA03 and SCD30. 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 Envsensor KiCad files?
From the bruvv/ENV-sensor-esp32 repository on GitHub, at the commit this page was made from: the board is envsensor/oud/_restore_backup_2026-05-30T16-42-54-646/envsensor.kicad_pcb and its schematic envsensor/envsensor.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Envsensor design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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