  Voltage controls the majority of the processes around us, starting from
lighting an incandescent lamp to running huge machines in industries.
Therefore, voltage monitoring becomes essential, which demands efficient
measurement and storage of voltage data. However, there is hardly any system
till date that fulfils both the goals of voltage monitoring and voltage data
storage. To achieve this goal, we propose the application of the Internet of
Things along with the server-based framework and Distributed Ledger Technology
to build systems for smart voltage monitoring. Two models - a centralised model
and a decentralised model have been presented and analysed thoroughly in this
paper. The centralised model is built on client-server architecture, whereas
the decentralised model is based on a peer-to-peer architecture. Blockchain and
InterPlanetary File System have been used for the implementation of the
decentralised system. Potential improvements to make these systems robust have
also been discussed. The methods proposed in this paper for voltage monitoring
are novel; ensure efficient data storage and can be used for IoT data storage
of any form.
