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 layers41 × 20.3 mm
Bme280
fm4dd/pmod-bme2802PMOD module for the Bosch BME280 Temperature Humidity Pressure Sensor, connection over I2C.
- Size
- 41 × 20.3 mm
- Copper layers
- 2
- Thickness
- 0.8 mm
- Parts
- 14
- Nets
- 13
- Pads
- 58
- Tracks, vias
- 129, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 4 Jul 2022
- Updated
- 18 Jul 2022
Overview
Bme280 is an open-source printed circuit board by fm4dd, from the fm4dd/pmod-bme280 repository on GitHub. It is a 2-layer board of 41 × 20.3 mm with 14 parts on 13 nets, routed with 129 tracks and 0 vias.
It is built around the BME280. Its parts include 3 capacitors, 2 resistors, 2 connectors, 2 switches and 1 IC. It belongs with the sensors and measurement boards of this library.
Main components
1README
readme.mdBME280 PMOD
Description
This PMOD connects the Bosch BME280 humidity, pressure and temperature sensor over I2C, using Digilent's PMOD interface type 6A per PMOD specification v1.3.1. The PMOD module can be chained to add additional I2C devices to the bus. The I2C pull-up resistors can be enabled/disabled using DIP switches, and switch 2 toggles the sensors I2C address between 0x76 and 0x77.
This design is registered under the OSHWA Open Source Hardware Self-Certification:
Schematic
PCB Gerber
PMOD Interface Pin Assignments
| Pin | Label | Description | Pin | Label | Description |
|---|---|---|---|---|---|
| 1 | - | Not connected | 7 | - | Not connected |
| 2 | - | Not connected | 8 | - | Not connected |
| 3 | SCL | I2C clock | 9 | - | Not connected |
| 4 | SDA | I2C data | 10 | - | Not connected |
| 5 | GND | ground | 11 | GND | ground |
| 6 | 3V3 | 3.3V | 12 | 3V3 | 3.3V |
All pins are passed through from connector J1 to J2, allowing to chain multiple type 6/6A PMODs.
Example Code
Linux
Above shows the BME280 PMOD, connected to a PMOD2RPI interface board. When connected through the PMOD4 connector, the module can be controlled from the Raspberry Pi 4 Linux, running the pi-bme280 control program.
Arduino
Without any changes, we can run BME280 sample code such as the BMx280_I2C example program from the BMx280MI library provided by Gregor Christandl. The BME280 PMOD module is connected to the PMOD2RPI interface board. On port PMOD1, the module communicates over I2C with the onboard Seeedstudio XIAO Cortex-M0 MCU.
Parts
14| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 0.1uF | Capacitor_SMD:C_0402_1005Metric | C1, C2, C3 |
| 2 | 4.7K | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 1 | BME280 | Package_LGA:Bosch_LGA-8_2.5x2.5mm_P0.65mm_ClockwisePinNumbering | U1 |
| 1 | Conn_01x02 | FM4DD:Testpoint_PinHeader_1x02_P2.54mm_Vertical | TP1 |
| 1 | JLCPCB_Order_Number_Placeholder | FM4DD:JLCPCB_Order_Number_Placeholder | Ref** |
| 1 | Logo_KiCad_5mm | FM4DD:KiCad-Logo2_5mm_SilkScreen | L1 |
| 1 | PMOD_02x06 | FM4DD:PMODHeader_2x06_P2.54mm_Horizontal | J2 |
| 1 | PMOD_02x06 | FM4DD:PMODPinSocket_2x06_P2.54mm_Horizontal | J1 |
| 1 | SW_DIP_x02 | Button_Switch_THT:SW_DIP_SPSTx02_Slide_6.7x6.64mm_W7.62mm_P2.54mm_LowProfile | SW1 |
| 1 | SW_SPDT | FM4DD:SW_SPDT_XKB-SS-3292S | SW2 |
| 1 | TestPoint_Conn_01x01 | FM4DD:TestPoint_PinHeader_1x01_P2.54mm_Vertical | TP2 |
Questions
How big is the Bme280 PCB?
It measures 41 × 20.3 mm and has 2 copper layers, 0.8 mm thick.
What parts does the Bme280 use?
14 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 KiCad files?
From the fm4dd/pmod-bme280 repository on GitHub, at the commit this page was made from: the board is kicad-t6a/bme280.kicad_pcb and its schematic kicad-t6a/bme280.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Bme280 design in my own project?
Its repository states no licence, so its author keeps all rights: ask fm4dd before reusing the design.
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