BME280 Environmental Sensor Module

The BME280 sensor is a small, low-power, high-precision sensor that is used to measure temperature, humidity, and barometric pressure. It is designed for use in a variety of applications, including indoor and outdoor weather monitoring.

The BME280 uses advanced MEMS (microelectromechanical systems) technology to measure temperature, humidity, and pressure. It has high accuracy and precision, with a temperature accuracy of ±0.5°C, a humidity accuracy of ±3%, and a pressure accuracy of ±1 hPa.

The BME280 sensor is also designed to be low-power, making it ideal for use in battery-powered devices. It communicates with the host system over I2C or SPI interfaces and is available in a small, compact package that is easy to integrate into a variety of designs.

Use this sensor where precise and accurate measurement of temperature, humidity, and pressure is required.

Specification

• Temperature measurement range: -40°C to 85°C
• Temperature measurement accuracy: ±0.5°C
• Humidity measurement range: 0% to 100%
• Humidity measurement accuracy: ±3%
• Barometric pressure measurement range: 300 hPa to 1100 hPa
• Barometric pressure measurement accuracy: ±1 hPa
• Power supply voltage: 3.6V
• Average current consumption: 0.1 to 3.6 µA
• Communication interfaces: I2C and SPI
• Operating temperature range: -40°C to 85°C
• Package size: 2.5 mm x 2.5 mm x 0.93 mm

Features

Power and Communication

The BME280 sensor is highly versatile and can be interfaced with either 3.3V or 5V compatible microcontrollers such as the STM32, ESP32, Teensy or Arduino microcontrollers.  A logic-level shifter is required if using a microcontroller with a logic level of more than 3.3V. This sensor requires 3.3V at the power inputs. Operating the controller above this voltage may irreversibly damage it.

Communication is done via the SPI or I2C bus. I2C is most recommended for a simple, 2-wire configuration and is addressable, meaning that many other I2C  compatible sensors can be connected to the same microcontroller I2C bus, increasing versatility. The default I2C address is 0x76. This can be changed to 0x77 by pulling the SDO pin high.

Uses:

• DIY weather station
• Altitude mapping