Controlling a Mains Device

So far you have been able to do a lot of interesting projects with your Raspberry Pi. There is, however, one topic that always comes up when you talk to anyone about practical uses for a microcontroller or, in your case, for the Raspberry Pi. That question goes something like “how can I turn on some random device in my house?” For example, you may want to turn on a lamp at night or your air conditioner before you get home. Nothing like a cron job to turn on your air conditioner! Now if you think about this quickly, getting the Raspberry Pi to turn on a random device is an easy task. In theory, turning a mains-powered ...

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