“Sprinkler Brain” – Cactus Micro Arduino Wi-Fi multi-zone Smart Sprinklers (DIY for under $20)

In some parts of the world, water usage is serious business. For example, there is a drought in California. If you live here, you know that they want you to water your lawn only twice a week. And if they catch you using too much water, they slap you with a higher rate for being […]

DIY Electric Imp WiFi garage opener + sensor for under $50 (weekend project)

Background story / motivation One night, I opened my garage door to take out the trash. Then I came back in and went to bed. The next morning, as I was strapping my son into his car seat, he asked me, “Daddy, why is that exercise ball over there?” “What? What exercise ball?” “That one. […]