Projects / Measurements, sensors and data acquisition
Autonomous three-axis vibration and tilt sensor with solar charging, onboard FFT, temperature and battery monitoring, and compact radio diagnostics.
The task was to create an autonomous sensor for remote monitoring of mechanical condition without cable infrastructure. The device had to wake up periodically, measure vibration, temperature and power state, calculate diagnostic features and transmit them to a base receiver.
A wireless vibration sensor was developed with three-axis acceleration measurement, tilt calculation, temperature and battery monitoring, solar charging and onboard spectral processing. Instead of transmitting the full time series, the device sends compact diagnostic parameters.
Project materials
Engineering context
Low power consumption, power management and short radio transmission are important for an autonomous sensor.
The radio channel should not be overloaded with a large raw time series.
A remote object needs monitoring of vibration, tilt, battery state, temperature and error indicators.
Spectral processing is useful onboard, so the device can transmit extracted frequencies and amplitudes rather than raw samples.
Work done
Autonomous sensor hardware.
Three-axis acceleration measurement.
Tilt-angle calculation.
Temperature and battery-voltage monitoring.
Solar charging support.
STM32L433 firmware with cyclic polling.
FFT processing and extraction of dominant spectral peaks.
Radio transmission of a compact diagnostic packet.
Details
The sensor does not transmit all raw data. It extracts dominant frequencies and amplitudes for three axes, adds tilt angle, temperature and power-state information, and then sends a short message.
The device is designed for battery operation with solar charging. The firmware and hardware switch off unnecessary nodes between measurement cycles.
This type of sensor is suitable for remote objects where vibration, tilt and node condition need to be monitored without cable routing and regular service. The sensors were operated for several months to check their performance, and vibration data from this operation was collected and analyzed.
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