DESCRIPTION

This Wireling lets you measure Humidity, Pressure, Temperature, and the approximate Altitude all from the small BME280 sensor. This sensor is an upgrade from the BMP280 used on our Barometric Pressure TinyShield because it also includes a Humidity Sensor.

New to Wirelings? Check out the Wireling Overview!

TECH SPECS

Bosch BME280 Sensor Specs

• Digital interface I²C (up to 3.4 MHz) and SPI (3 and 4 wire, up to 10 MHz)
• Operating range -40…+85 °C, 0…100 % rel. humidity, 300…1100 hPa
• Humidity sensor and pressure sensor can be independently enabled/ disabled
• Register and performance compatible with Bosch Sensortec BMP280 digital pressure sensor
• RoHS compliant, halogen-free, MSL1
• Pressure Sensor 
• RMS Noise 0.2 Pa, Equiv. to 1.7 cm
• Offset temperature coefficient ±1.5 Pa/K, Equiv. to ±12.6 cm at 1 °C temperature change
• Humidity Sensor:
• Response time 1 s
• Accuracy tolerance ±3 % relative humidity
• Hysteresis ±1% relative humidity

TinyDuino Power Requirements

• Voltage: 3.0V - 5.5V 
• Current:
• 1.8 µA @ 1 Hz humidity and temperature
• 2.8 µA @ 1 Hz pressure and temperature
• 3.6 µA @ 1 Hz humidity, pressure, and temperature
• 0.1 µA in sleep mode

Pins Used

• A5/SCL - I²C Serial Clock line
• A4/SDA - I²C Serial Data line

Dimensions

• 10mm x 10mm (.394 inches x .394 inches)
• Max Height (from the lower bottom of Wireling to upper top Wireling Connector): 3.70mm (0.15 inches)
• Weight: 1 gram (.04 ounces)

NOTES

• You can also use this Wireling without the TinyDuino – modifying the connecting cable by removing the opposite connector and stripping/tinning the wires, you can solder the connector cable to any other microcontroller board of your choice!   

DOWNLOADS

• Bosch BME280 Datasheet
• Schematic
• Eagle Files
• Sample Arduino code
• CAD 3D and 2D Files