2 layers70.1 × 43.2 mm
Iaq device
nkitanov/iaq_board
IAQ Board is a DIY (Do-It-Yourself) device for measuring internal air quality
19 parts396
2 layers14.5 × 13.5 mm
Bme280 sensor
chaitya37/bme280-i2c-breakoutKiCad breakout board for the bosch BME280 sensor. I2C interface with onboard pullups and decoupling- ready to plug any microcontroller project
- Size
- 14.5 × 13.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 5
- Nets
- 4
- Pads
- 18
- Tracks, vias
- 63, 4
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 18 Jul 2026
- Updated
- 18 Jul 2026
Overview
Bme280 sensor is an open-source printed circuit board by chaitya37, from the chaitya37/bme280-i2c-breakout repository on GitHub. It is a 2-layer board of 14.5 × 13.5 mm with 5 parts on 4 nets, routed with 63 tracks and 4 vias.
It is built around the BME280. Its parts include 2 resistors, 1 capacitor, 1 IC and 1 connector. It belongs with the sensors and measurement and interfaces and adapters boards of this library.
Main components
1README
README.mdBME280 I2C Breakout
A minimal, ready-to-use I2C breakout board for the Bosch BME280 temperature/humidity/pressure sensor. Designed in KiCad — exposes a clean 4-pin interface (VCC, GND, SDA, SCL) for easy connection to any microcontroller.
Specs
| Parameter | Value |
|---|---|
| Input | 3.3V |
| Interface | I2C |
| I2C address | 0x76 (SDO tied to GND) |
| Current draw | <1mA typical |
| PCB | 2-layer |
PCB Layout
Schematic
See schematic.pdf for the full schematic.
Design Notes
- I2C pull-ups (4.7kΩ on SDA/SCL): Required since I2C is an open-drain bus — without pull-ups, the lines can't idle high, and no communication is possible.
- Decoupling (100nF ceramic on VDD): Placed directly next to the sensor's VDD pin for a clean, local power supply during measurement cycles.
- CSB tied to 3.3V: Forces the sensor into I2C mode (as opposed to SPI mode, which triggers if CSB is pulled low).
- SDO tied to GND: Sets the I2C address to 0x76. (Tying SDO to VCC instead would set it to 0x77, useful if you need two BME280s on the same bus.)
- VDDIO tied to VDD: Both power rails on the same 3.3V supply, per Bosch's standard single-supply configuration.
- Ground plane: Bottom-layer copper pour tied to all GND pads via vias, for a clean, low-impedance return path.
Bill of Materials
Full BOM: Bme280 sensor.csv
| Ref | Component | Value/Part | Footprint |
|---|---|---|---|
| U1 | Sensor | BME280 | Bosch_LGA-8_2.5x2.5mm_P0.65mm |
| R1, R2 | Resistor | 4.7kΩ | R_0805_2012Metric |
| C1 | Capacitor | 100nF | C_0603_1608Metric |
| J1 | Pin Header | 1x4, 2.54mm | PinHeader_1x04_P2.54mm_Vertical |
Note: the BME280 ships in an LGA-8 package (2.5x2.5mm, 0.65mm pitch) — hand-soldering this without hot air rework or a reflow setup is very difficult. Recommended: use JLCPCB/PCBWay's assembly service to have the sensor placed and reflowed for you.
Files
Bme280 sensor.kicad_sch— KiCad schematic sourceBme280 sensor.kicad_pcb— KiCad PCB sourceschematic.pdf— Exported schematicgerber.zip— Fabrication-ready Gerber files (JLCPCB/PCBWay compatible)drill.zip— Drill filesBme280 sensor.csv— Bill of materials
Status
Designed and DRC-clean (0 violations, 0 unconnected nets). Boards ordered for fabrication — photos and test results to be added once assembled.
License
MIT — feel free to use, modify, or build on this design.
Parts
5| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 4.7k | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2 |
| 1 | 100n | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1 |
| 1 | BME280 | Package_LGA:Bosch_LGA-8_2.5x2.5mm_P0.65mm_ClockwisePinNumbering | U1 |
| 1 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J1 |
Questions
How big is the Bme280 sensor PCB?
It measures 14.5 × 13.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Bme280 sensor use?
5 parts, built around the BME280. 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 Bme280 sensor KiCad files?
From the chaitya37/bme280-i2c-breakout repository on GitHub, at the commit this page was made from: the board is Bme280 sensor.kicad_pcb and its schematic Bme280 sensor.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Bme280 sensor design in my own project?
Its repository states no licence, so its author keeps all rights: ask chaitya37 before reusing the design.
Similar boards
- 4 layers38.6 × 39.5 mm
- 4 layers35.1 × 76.3 mm
Tiny4FSK
New-England-Weather-Balloon-Society/Tiny4FSK
Horus Binary v2 HAB Tracker
90 parts96CERN-OHL-W-2.0 - 2 layers29.8 × 33.7 mm
- 2 layers136 × 100 mm
ClimateSprinklerController
kbx81/ClimateSprinklerController
ESP32-based climate and sprinkler controller for use with ESPHome
194 parts56 - 4 layers36.6 × 60.3 mm
StratoSoar MK3.0
crnicholson/StratoSoar-MK3
StratoSoar MK3, an autonomous glider meant for high-altitudes, accessible to everyone
85 parts43 - 2 layers23 × 50 mm
- 2 layers97 × 77.5 mm
ESPlant
CCHS-Melbourne/ESPlant
Environmental Sensor Plant - solar WiFi gardening/meteorological sensor using ESP8266
77 parts37