Product Specs

2.5 Humidity Sensor

The sensor is a BME280 is a combined digital humidity, pressure and temperature sensor based on

proven sensing principles. The humidity sensor communicates via 12C (address 0x77)

Features include:

 0% to 100% relative humidity

 300 to 1100 hPa pressure

The datasheet for this device can be found here:

https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bme280-ds002.pdf

Figure 3-1: Humidity Schematic

2.6 Accelerometer

The low power I2C 12-bit 3-axis accelerometer (ST LIS2DH12) with configurable interrupt generation

enables motion, freefall, and orientation detection.

Features include:

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±2 g, ±4 g, ±8 g, and ±16 g dynamically selectable full-scale ranges

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Output Data Rates (ODR) from 1 Hz to 5.3 kHz

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12-bit digital output

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Configurable motion detection (Freefall, Motion, Pulse, Transient)

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Ultra Low power (3 µA in 10Hz low power 8 bit mode)

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2 programmable interrupts

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The datasheet for this device can be found here:

www.st.com/resource/en/datasheet/lis2dh12.pdf

The accelerometer communicates via I2C (address 0x19) and also routes two (2) separate interrupt pins

which allow the accelerometer to wake on predefined acceleration events. It is setup as shown in Figure

3-1.