BME280 (GY-BME280): specs and pinout

Combined humidity, pressure and temperature sensor chip with I2C or SPI interface.

Every value cites its sourceChip-level pinout

Specs

Spec	Value	Source
Supply voltage VDD	1.71 V to 3.6 V	source Table 1 Electrical parameter specification
Interface supply VDDIO	1.2 V to 3.6 V	source Table 1 Electrical parameter specification
I2C address	0x76 (SDO to GND) or 0x77 (SDO to VDDIO)	source Section 6.2 I2C Interface
Humidity range	0 to 100 %RH	source Table 2 Humidity parameter specification
Pressure range (full accuracy)	300 to 1100 hPa	source Table 3 Pressure parameter specification
Operating temperature	-40 C to +85 C	source Table 4 Temperature parameter specification
Sleep current	0.1 uA typ, 0.3 uA max	source Table 1 Electrical parameter specification (IDDSL)

Power

	Value	Source
Supply	VDD 1.71 V to 3.6 V; VDDIO 1.2 V to 3.6 V	source Features (current consumption); Table 1
Current	1.8 uA at 1 Hz humidity and temperature measurement; sleep 0.1 uA typ	source Features (current consumption); Table 1

Chip pins

These are the pins of the chip on the module, from the chip datasheet. The module's own header may label or expose them differently.

The GY-BME280 module board (regulator, pull-ups, header order, 5 V input) is not covered by any official document. These pin rows are the chip pin table, not the module header.

Pin	Function	Voltage	Notes	Source
1	GND, ground		Connect to GND (I2C and SPI)	source Section 7.1 Pin-out, Table 35
2	CSB, chip select		I2C: connect to VDDIO to select I2C	source Section 7.1, Table 35
3	SDI, serial data input (I2C: SDA)		Open-drain; needs pull-up to VDDIO per Section 6.2	source Section 7.1, Table 35
4	SCK, serial clock input (I2C: SCL)		Connect to SCL in I2C mode	source Section 7.1, Table 35
5	SDO, serial data output (I2C: address bit 0)		GND gives 0x76; VDDIO gives 0x77. Cannot float.	source Section 6.2, Table 35
6	VDDIO, digital interface supply	1.2 V to 3.6 V (Table 1)		source Table 1, Table 35
7	GND, ground			source Section 7.1, Table 35
8	VDD, analog supply	1.71 V to 3.6 V (Table 1)		source Table 1, Table 35

Build with it

Project ideas for the BME280 (GY-BME280). Each link opens Soldr with the prompt filled in; Soldr assigns the pins, checks power and shows how to wire every part.

Weather station on an OLED: The ESP32's 3.3 V is inside the chip's 1.71-3.6 V supply range and the BME280 speaks I2C at 0x76 or 0x77.
Room climate logger: All three sensor readings come over one I2C connection; the chip's sleep current is 0.1 uA typ if the logger sleeps between readings.
A small web page on my home network that shows temperature, humidity and pressure with a NodeMCU ESP8266 board and a BME280 sensor: The NodeMCU is a 3.3 V Wi-Fi board with I2C; power the sensor from 3.3 V.
Pressure change display: The chip measures 300-1100 hPa at full accuracy; the pressure trend is worked out in software. A learning project, not for navigation.

Common mistakes

Feeding 5 V straight into VDD: the chip is rated 1.71 to 3.6 V (Table 1), and the absolute maximum on any supply pin is 4.25 V (Table 5). The listing says 5 V; the module regulator is not in any official document (source)
Leaving SDO floating: the I2C address is then undefined. Tie SDO to GND for 0x76 or to VDDIO for 0x77 (source: link, Section 6.2)
Missing pull-up on the data line: Section 6.2 says SDI is open-drain and must be pulled up to VDDIO; Figure 17 shows pull-ups R1 and R2 on the I2C lines (source: link, Section 6.2 and Figure 17)

Not covered by the official source

Module board not covered: regulator, pull-up values, header order and any 5 V input are not in the data sheet. The listing's '5V' is not verified and is not stated as a spec.
Pin table is the chip pin table (Table 35), not the module header.
Data sheet cover shows revision 1.24 (BST-BME280-DS001-24, Feb 2024) while page footers show 1.23; the cover revision is cited.

Sources

link (Bosch Sensortec BST-BME280-DS001-24, BME280 data sheet rev. 1.24, Feb 2024)