Building Your Own Ethereum Hardware Wallet For $5

In this post we will build Firefly hardware wallet.

It’s an open-source, affordable, air-gapped hardware wallet for Ethereum you can build at home for around $5 in parts.

Here is a short video of its final working model.

Here are some of its features:

• Low Cost: Build it yourself for about $5 with an Arduino, a 2.4GHz radio, an OLED display and a few odds and ends.
• Air Gapped: Not connected by wires and cannot send wireless signals, keeping your private key safe from hackers.
• Mobile Friendly: Works with any smart phone to prepare and send transactions or sign secure messages.
  Check out the full article here: https://hackernoon.com/building-your-own-ethereum-hardware-wallet-for-5-c85fe7405276