The “Smooth Stone” is a new iteration of the design that takes into further account the applications and feasibility of the package. This design was waterproofed, and the cavity from the original design was replaced to improve accessibility. (See image 6 “Waterproofing” for design changes.)

The bread and butter of our sensor package. Uses an accelerometer (MPU-6050), real-time clock, and an SD card to measure vibration and data log.

Data is written on the SD card in CSV format. Writing begins with the date and time, followed by x-raw, y-raw, and z-raw values from the accelerometer.

Plotting the data demonstrates a working system. Spikes in the graph occur when vibrating the sensor.

Tests with the package in practical applications are coming soon... For now, the next step is to work on strictly defining parameters so that both the design, and the sensors used, can be optimized. This will likely include adding a variety of other sensors.

O-rings are used to seal the gap between the top and bottom pieces. A tight fit creates a waterproof seal. The cavity of the original design is replaced with a ridge to hold a dividing plexiglass layer. This allows easy access to sensors stored below the plexiglass.