I've started doing some hardware hacking as part of my new job, I'm amazed at what is available these days. This NodeMCU costs about $5, has built in WiFi, is programmable through the Arduino IDE and can be powered by a small solar panel. I'm blown away.

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@mhall119 Here is an ESP32 board from WeMos...even smaller, more powerful and similar cost. Not as well supported in Arduino IDE yet but super cool nonetheless...

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