• An Ethereum Smart Contract, and a Human Social Contract, together.

  • Apartments are getting smaller and smaller, so there's less space for bulky appliances, like vacuums.

  • Instead, have a secure room with communal appliances that can be rented out.

  • The problem with rental equipment is that people don't care, they tend to get misused as no one takes ownership.

  • By leveraging the transparency of the Ethereum blockchain, we have integrated social consequences into rental equipment, ensuring they are treated with care.

  • Anyone can see who last took out an item, and how well they treated it, giving an incentive to be responsible.

What it does

  • Appliances are fitted with an IoT smart device, which then interfaces with a lock
  • The lock has a connection to the Ethereum Network
  • When the device is unlocked with an RFID keycard it is recorded into the publicly viewable Ethereum Blockchain
  • Then, when the device is returned, the Blockchain records the condition of the device
  • This includes things like if it was dropped or damaged, or if it was left wasted on a shelf for weeks

How we built it

  • We used Ganache to host a private Ethereum Network, and used Truffle to deploy smart contracts.
  • Remix was used extensively for offline testing and validation
  • We built a smart IoT device using an Arduino, IMU and RFID modules, and an LCD screen which we soldered and hot-glued together
  • The locker mechanism uses a servo motor to open and close the compartment which houses the IoT device
  • It also uses two RFID modules: one to authenticate the user and unlock the asset, the other to communicate with the asset about its condition when it is returned.

Challenges we ran into

  • Working with Solidity and Ethereum for the first time proved to be quite challenging but in the end we got it to work
  • Countless RFID challenges including reliably reading data and establishing connections

Accomplishments that we're proud of

  • It works! The dapp (distributed app) successfully runs on the Ethereum network!
  • Building both the IoT device and the locking device in such a short time
  • Being able to communicate with the RFID modules and tags

What we learned

  • This was our first time creating an Ethereum project! Solidity is a very interesting language, and there was a lot to learn to make things work. ConsenSys's tools, like Truffle and Ganache made the learning process easier and faster.
  • This was also our first time using RFID reader modules and exchanging data using this communication protocol

What's next for Diamond

  • Full deployment to the Ethereum rinkeby testnet through Infura.
  • Further prototyping for the physical lock design.

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