Ever wanted to play with the computer that sparked the personal computer age but don't have the cash to buy an Altair?
Build your own!
Project tutorial by David Hansel
It can detect metal coin at 15cm +, and bigger metal objects at 50cm and more. Also capable of discriminating between ferrous and nonferrous
Project tutorial by Mirko Pavleski
Not just a Smart Coffee Maker with Smartphone control, it's a multipurpose ThermoGraph also!
Project tutorial by Gyula Ősi
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