BMP280 — i2c address & wiring
Barometric pressure and temperature — the humidity-free sibling of the BME280.
Key facts
BMP280 at a glance
| i2c address | 0x760x77 address-selectable via pins/jumpers |
|---|---|
| Logic voltage | 3.3–5 V |
| Type | sensor |
| Part | Bosch BMP280 |
| Ships with | Qwiic, STEMMA QT |
| Datasheet | Bosch BMP280 — manufacturer documentation ↗ |
The chip
What the Bosch BMP280 actually is
Digital barometric pressure and temperature sensor based on Bosch MEMS technology. Functionally similar to the BME280 but without integrated humidity sensing, making it suitable for pressure measurement and altitude estimation.
Watch out: Buying one on purpose is fine — receiving one labelled 'BME280' is the scam to watch for. If a supposed BME280 reports no humidity and ID register 0xD0 reads 0x58, this is the chip you actually got.
Wiring
How to connect the BMP280
The BMP280 talks i2c at address 0x76 (up to 2 selectable addresses, handy when you need more than one on the same bus). It runs at 3.3–5 V, so match your host's logic level — if your host is 5 V and a board on the bus is 3.3 V-only, add a level shifter. Use the compatibility checker to confirm the exact cable for your setup.
Because the address is selectable, you can run several BMP280 boards on one bus by setting each to a different address — no extra wiring beyond the shared SDA/SCL.
Wiring is the usual four: power, ground, SDA and SCL, plus pull-up resistors — almost always already fitted on the breakout. Nothing showing up? Run an i2c scan first; if the bus is silent, the 7-step checklist finds it faster than guessing.
Ecosystems
Plug-together options for the BMP280
BMP280 breakouts ship with Qwiic and STEMMA QT — keyed 4-pin cables carrying power, ground, SDA and SCL, so there's nothing to solder and nothing to wire backwards. Chain it to the next board and keep going.
Running a mixed bench? Those ecosystems interoperate more than their marketing suggests — see every connector pairing for the cable or adapter you need, or the standards overview for how they compare.
Go deeper
Guides covering the BMP280
Alternatives
Other environmental boards
Watch the bus
Boards that clash with the BMP280
These want addresses the BMP280 also answers (0x76, 0x77), so they can't share a bus with it untouched. If one is address-selectable, strap it elsewhere; if not, the conflict guide covers the multiplexer and second-bus routes, and the collision roundup explains why a scan won't warn you.
Get one
Questions
BMP280 i2c FAQ
What is the BMP280's i2c address?
The BMP280 uses 0x76 or 0x77, selected with an address pin or solder jumper on the board. If a scan turns up something unexpected, our i2c address list names the usual suspect for every address.
What voltage does the BMP280 run at?
3.3–5 V logic. That range covers both 3.3 V and 5 V hosts, so it drops onto a Pi, ESP32 or Arduino without a level shifter.
Can I use two BMP280s on one i2c bus?
Yes — set each one to a different address (0x76, 0x77) using its address pin or jumper, then wire both to the same SDA/SCL. That gives you up to 2 on a single bus before you need a multiplexer.
Does the BMP280 work with Qwiic and STEMMA QT?
Yes — BMP280 breakouts ship with Qwiic / STEMMA QT, so it plugs straight in with no soldering. Mixing ecosystems? The compatibility checker gives you the exact cable or adapter.
What should I watch out for with the BMP280?
Buying one on purpose is fine — receiving one labelled 'BME280' is the scam to watch for. If a supposed BME280 reports no humidity and ID register 0xD0 reads 0x58, this is the chip you actually got.