I'm streaming a video to a beamer. But I want it too turn it off after office hours.
/opt/vc/bin/tvservice -o and
/opt/vc/bin/tvservice -p to turn off the screen. But that does not turn off the beamer (I can still see the light is on)
I guess I can switch on / off the beamer using serial communications. There is a a port on the beamer for RS232, I could not find documentation for this specific beamer.
So I bought a usb to RS232 cable.
When I plug it in I see
cat /dev/ttyUSB0 returns nothing.
Where do I start? I'm not familiar with Python (mostly a php programmer)