Flexible machine monitoring by combination of autonomous wireless sensors with a web-interfaced sensor system

Sensor systems for machine monitoring (energy monitoring, condition monitoring) can be built up from available low cost components. The Raspberry Pi, being a miniature PC, is well suited to collect and save data, to control a human machine interface and make the connection to the Web via Ethernet. Metering the energy of a 3 phase power line can be done by an energy metering sensor combined with an Arduino Uno microcontroller. The used sensor ADE7758 can do energy and power measurement with about 1% accuracy. Autonomous, wireless sensors working on energy harvesting principles complement the system by measuring additional physical quantities and building a sensor network distributed over the machine. The use of programmable sensors is necessary to analyze measured data and transmit only a few specific values, thus having a minimum number of transmitted bytes.

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