The atmospheric pressure sensor is a board that is made up of elements such as SMD resistors, SMD capacitors and a "BME280" chip developed by the company BOSCH and has the technology to measure pressure, temperature and humidity. It is specially designed for mobile applications and wearable technology where its shape and energy consumption are key variables for the design of a system. In addition, the sensor offers an extremely fast response time.
What is it for?
The atmospheric pressure sensor is used to measure pressure, temperature and relative humidity. In addition, everything is integrated into a single piezo-resistive chip that is really compact and has low energy consumption.
They are also used in some applications such as: warning about dryness or high temperatures, volume and air flow measurement, altitude calculation for autopilot systems, and weather forecasting.
SPECIFICATIONS AND FEATURES
Operating voltage: 1.8 V to 3.3 V
Pressure: 300 to 1100 hPa
Temperature: -40°C to 85°C
Relative Humidity: 0-100% RH
Base device: BME – 280
Interfaces: I2C (Up to 3.4 Mhz) and SPI (Up to 10 Mhz)
Dimensions: 11.6 x 15.6 x 2.4 mm
Weight: 0.90 grams
This BME280-3.3 sensor presents high accuracy and good linearity in its measurements. Thus, this chip is mounted on a module to simplify its connection to a microcontroller. For communication you just need to connect it directly via I2C (SDA and SCL) or SPI.
To use the BME280 with an Arduino Uno and obtain values of Temperature, Humidity and Pressure you can make 2 types of communication either by SPI and I2C.