has stepped up their game with their new BMP280 sensor, an environmental sensor with temperature, barometric pressure that is the next generation upgrade to the BMP085/BMP180/BMP183. This sensor is great for all sorts of weather sensing and can even be used in both I2C and SPI! This precision sensor is the best low-cost, precision sensing solution for measuring barometric pressure with ±1 hPa absolute accuracy, 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 accurac Typical application: Enhancement of GPS navigation e.g.time-to-first-fix improvement,dead-reckoning,slope detection Indoor navigation(floor detection,elevator detection) Outdoor navigation,leisure and sports applications Weather forecast Health care application(e.g. sirometry) Vertical velocity indication(e.g. risk/sink speed) Target devices Handsets such as mobile phones ,table PCs,GPS devices Navigation systems Portable health caredevices Home weather stations Flying toys Watches PCB size:(L*W)1.52* 1.20cm/0.60"*0.47"

BME280 3.3V: BEM280 technical parameters: Relative humidity range: 0-100% The temperature range is -40 ° C- + 85 ° C Humidity measurement response time: 1S Lag: relative humidity 2% Pressure range: 300-1100 hPa Absolute pressure accuracy: Absolute value ± 1hPa (after welding) Absolute temperature accuracy: ± 0.5 ° C (at 25 ° C) Communication interface: I2C, SPI Product parameters: Working voltage: DC3.3V

BME280 5V: 100% brand new and high quality BME280, the precision sensor from Bosch, is soldered onto PCB. Not only the pressure and the temperature, this sensor can measure humidity. It uses both I2C and SPI (supports 3-, 4-wire SPI) interface Specifications: Supply Voltage: 1.8 - 5V DC Interface: I2C (up to 3.4MHz), SPI (up to 10 MHz) 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: +-1Pa I2C address SDO LOW : 0x76 SDO HIGH: 0x77

BMP280 5V: Description Thanks to Bosch, now we've got a high-precision environmental sensor at even lower cost, Barometer Sensor(BMP280). It is based on their new BMP280 sensor, which is an upgraded version of the old BMP180 Barometer Sensor (BMP180). The module provides precise measurement of barometric pressure and temperature in the environment. The air pressure can be measured in a range from 300 hPa to 1100hPa with ±1.0 hPa absolute accuracy. As for the temperature the sensor works perfectly for temperatures between - 40 and 85 with an accuracy of ±1. Owing to its high accuracy on measuring the pressure, and the pressure changes with altitude, we can calculate the altitude with ±1 meter accuracy, which makes it a precise altimeter as well. Another great thing about this module is that, you don't even need to worry about the I2C collisions as it provides both I2C and SPI interfaces. To use SPI, simply de-solder the bonding pads on the back. If you go with I2C, the board also provides 2 I2C addresses for you to select as you want. Note: As the sensor is quite sensitive to the environmental conditions, please DO NOT touch it with your fingers. Features High accuracy, absolute accuracy of ±1.0 hPa for pressure measurement and ±1 accuracy for temperature measurement Supports both I2C and SPI communication Can be used as an altimeter with accuracy of ±1 meter Specification Supply Voltage: 5V Current Consumption: 0.6 mA Barometric Pressure Measure • Range: 300 - 1100 hPa • Accuracy: ±1.0 hPa Temperature Measurement • Range: -40 to 85 • Accuracy: ±1 Interface: I2C and SPI