Turning your TV on or off using the Pi
For this example, we are relying on a technology called Consumer Electronics Control (CEC), which is a feature of the HDMI standard to send control messages to your home electronics equipment.
To help us send these messages, we'll need a software package called libCEC. While previously we had to build the libCEC package ourselves, we can now download a version for Raspbian Jessie using the installer:
pi@raspberrypi ~ $ sudo apt-get install libcec3 cec-utils
We will be using a utility called cec-client to send CEC messages to the TV. Issue the following command to switch off your TV:
pi@raspberrypi ~ $ echo "standby 0" | cec-client -d 1 -s
Use the following command to turn your TV on again:
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