Sensors; Temperature, Humidity And Pressure Sensor; Specifications - Libelium Smart Cities PRO Technical Manual

5. Sensors

Many of the sensors available for Smart Cities PRO are actually migrated from the Gases PRO sensor board,
where they were integrated initially. For a better understanding of the characteristics of sensors, its calibration
and performance, it is highly advised to read the Gases PRO Technical Guide, specially the chapters "Gases
PRO sensor board", "Hardware" and "Sensors".

5.1. Temperature, Humidity and Pressure Sensor

The BME280 is a digital temperature, humidity and atmospheric pressure sensor developed by Bosch Sensortec.

5.1.1. Specifications

Electrical characteristics
Supply voltage: 3.3 V
Sleep current typical: 0.1 μA
Sleep current maximum: 0.3 μA
Temperature sensor
Operational range: -40 ~ +85 ºC
Full accuracy range: 0 ~ +65 ºC
Accuracy: ±1 ºC (range 0 ºC ~ +65 ºC)
Response time: 1.65 seconds (63% response from +30 to +125 °C).
Typical consumption: 1 μA measuring
Humidity sensor
Measurement range: 0 ~ 100% of relative humidity (for temperatures < 0 °C and > 60 °C see figure below)
Accuracy: < ±3% RH (at 25 ºC, range 20 ~ 80%)
Hysteresis: ±1% RH
Operating temperature: -40 ~ +85 ºC
Response time (63% of step 90% to 0% or 0% to 90%): 1 second
Typical consumption: 1.8 μA measuring
Maximum consumption: 2.8 μA measuring
Figure: Temperature, Humidity and Pressure Sensor
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Sensors
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