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Start up tv when RPI powers up?

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mahuti:
I have a TV I'll be using as a monitor (for now). It doesn't have a "start up after power on" feature... so the only way to turn it on is via remote, or button press.

When the raspberry pi powers on, I want to send that button press signal to the TV to power on. Has anyone done anything like this before? I'm guessing it's kind of a simple operation using the GPIO pins to control a relay. Might need to be something between the GPIOs and the relays.. I don't know. Any thoughts?

Worse comes to worse I could use IR to do it.... but meh.

vinegar:
what happens if you supply power to the set while holding down the power button, and keep it held?

i'm thinking it might be better to permanently bridge the power button so it's always "pressed" if possible, and handle power on/off for the whole rig, pi and tv, at a central switch.  if you start trying to do this programmatically with an optocoupler or something, murphy's law applies and you'll end up out of sync at some point when it fails to turn "off" or "on" and the pi has no awareness of the tv's state.  and anyway, you'd be adding the pi's boot time and the tv's warm-up time together to get from switch to playable since the pi's gotta boot at least a bit before you can set GPIOs, which may get annoying.

mahuti:
I'll check. Good idea.

vinegar:
some virtual pinball heads do this with their playfield tvs now, since so few lcds have that power setting unless you go with expensive hospitality sets.

Slippyblade:
I power my Pi's directly off of the TV.  Just poke around with a meter until you find a solid 5v and run the Pi off of that.  That way, you turn on the TV and the TV powers the Pi.

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