BME280 I2C Pressure Humidity Temperature Sensor Module

BME280 I2C Pressure Humidity Temperature Sensor Module

BME280 sensor, an environmental sensor with temperature, barometric pressure and humidity! This sensor is great for all sorts of weather/environmental sensing and can even be used in I2C.

This precision sensor from Bosch is the best low-cost sensing solution for measuring humidity with ±3% accuracy, barometric pressure with ±1 hPa absolute accuraccy, and temperature with ±1.0°C accuracy. Because pressure changes with altitude, and the pressure measurements are so good, you can also use it as an altimeter with  ±1 meter or better accuracy!

The BME280 is the next-generation of sensors from Bosch, and is the upgrade to the BMP085/BMP180/BMP183 – with a low altitude noise of 0.25m and the same fast conversion time. For simple easy wiring, go with I2C.

Features:

• Multi-Sensor Capability Measures temperature, humidity, and barometric pressure simultaneously.
• Low Power Consumption Less than 1mA during measurements, 5μA in idle mode, ideal for battery-powered devices.
• Fast Response Time Humidity sensor response time of 1 second.

Specifications:

Supply Voltage: 3.3 – 5V DC

• Interface: I2C (up to 3.4MHz)

• Operational Range:

  • Temperature: -40 to +85°C
  • Humidity: 0-100%
  • Pressure: 300-1100 hPa

• Resolution:

  • Temperature: 0.01°C
  • Humidity: 0.008%
  • Pressure: 0.18Pa

• Accuracy:

  • Temperature: +-1°C
  • Humidity: +-3%
  • Pressure: +-1hPa

• I2C address:

  • SDO LOW : 0x76
  • SDO HIGH: 0x77

Dimensions:12.5mm x 10mm x 2mm

Using the I2C Interface

The I2C interface provides MOSFET logic level shifters for use with either 3.3V or 5V MCUs.

The module supports two different I2C addresses, either 0x76 or 0x77 which allows up to 2 sensors to be used on the same bus.  As shipped, a trace between pads on the board next to the BME280 chip grounds the SDO pin on the BME280 chip which pulls SDO low so 0x76 is the default address .  If it is desired to change the I2C address, cut the trace connecting the two pads and solder short the other two pads which pulls the SDO pin high for address 0x77.

The SCL and SDA pins connect to the SCL and SDA pins on the MCU.

Module Connections:

The module brings out the following connections.

1 x 4 Header

• VIN=  3.3 or 5V to match MCU
• GND = Ground
• SCL =   I2C Clock
• SDA =  I2C Data

Resources:

Datasheet