BME680 HUMIDITY SENSOR EDDIE SHEA RUCHEN TANG SEAN SWALVE.

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Presentation transcript:

BME680 HUMIDITY SENSOR EDDIE SHEA RUCHEN TANG SEAN SWALVE

Some useful definitions Absolute humidity is the mass of water vapor divided by the mass of dry air in a certain volume of air at a specific temperature Relative humidity (RH) is the ratio of the partial pressure of water vapor to the equilibrium vapor pressure of water at a given temperature (Amount of water vapor / the amount needed for saturation)

Thermal Conductivity Humidity Sensors Use the difference in specific heat between dry air and moist air to calculate the absolute humidity

Thermal Conductivity Humidity Sensor Respond to any gas that has thermal properties different from those of dry nitrogen gas, which will affect the measurements. Suitable for relatively high temperature and provides greater resolution at T> 90 ℃ than do capacitive & resistive sensors ±3g/m^3 accuracy on absolute humidity (about ±5%RH at 40 ℃ and 0.5%RH at 100 ℃)

Capacitive Humidity Sensor Dielectric material sandwiched between two electrodes Dielectric material is able to absorb water vapor The dielectric material absorbs water vapor until it is in equilibrium with the ambient water vapor concentration Absorbing more water vapor raises the capacitance value by a known value

Capacitance vs Relative Humidity

BME680 Humidity Sensor Specs

References https://www.sensorsmag.com/components/choosing-a-humidity-sensor-a-review-three-technologies https://cdn-shop.adafruit.com/product-files/3660/BME680.pdf https://www.rotronic.com/en-us/humidity_measurement-feuchtemessung-mesure_de_l_humidite/capacitive-sensors-technical-notes-mr