QuakeSense | source LoRa-compliant earthquake

QuakeSense is a C++ library typically used in Internet of Things (IoT), Raspberry Pi, Arduino applications. QuakeSense has no bugs, it has no vulnerabilities, it has a Strong Copyleft License and it has low support. You can download it from GitHub.

Each sensor node consists of the following components:. By default, each sensor node runs in Low-Power mode. In this configuration, the STM32 MCU runs in Stop mode (the MCU is stopped and the clocks are switched off, but SRAM and registers content are kept), the GPS module is in AlwaysLocate mode (an intelligent power saving mode that allows the GPS module to adaptively and automatically adjust the full on time according to the environmental and motion conditions), while the LoRa module in Standby mode for the maximum energy saving. When a seismic event occurs, the accelerometer generates an interrupt associated to the wake-up event and the node starts running in Run mode, which results in waking up the STM32 MCU and the GPS module in Full On mode, while the LoRa module is put in Transmit mode. The wake-up event happens if at least one of the 3 acceleration components exceeds the reference threshold (50 mg for the horizontal components, 1120 mg for the vertical one). Once in Run mode, the sensor node starts reading and recording acceleration data to compute the bracketed duration, defined as the time interval between the first and last exceeding of the acceleration threshold, and the 3 components of the Peak Ground Acceleration (PGA), defined as the maximum amplitude of acceleration in absolute value. The computed strong-motion parameters are also geo-referenced thanks to the GPS module, so that latitude, longitude, altitude, date and time paramters are added to the LoRa packet that is finally sent to the gateway. The baseline behavior of the node foresees a periodical (by default, every 15 minutes) monitoring of the environmental parameters (temperature, relative humidity and pressure) through the LPS22HB and HTS221 MEMS sensors.