28 Apr '14, 4pm

How to Automate Your Home Without Rewiring

How to Automate Your Home Without Rewiring

Instead, I’m stuck, so to speak, with the Nordic Semiconductor nRF24L01+, a mesh-network transceiver with way more features than I need. But it can wake up, do its business in a few milliseconds, and go back to sleep. (It’s $20 a unit from Sparkfun, but from a Shenzhen, China, supplier in the backwaters of the Internet, it’s a fifth that price if you order enough items to justify the terrifying shipping charge.) Once again, hackers have built and made available RF24-series libraries for the ATTiny84 as well as for regulation Arduinos. Power consumption in standby mode is a few dozen microamperes, which matches well with the similar amount used by the microcontroller in deep-sleep mode. Consequently, I expect to get six months out of the batteries, maybe more. Once I get a bunch of units built, say one for each light fixture, I’m going to test different power-saving strateg...

Full article: http://spectrum.ieee.org/geek-life/hands-on/how-to-automa...

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