The difference of this project is that it is not in my house, it is in my touring caravan. Before anyone has a go about caravans clogging the roads up ect I do agility dog shows most weekends, so it is either use a caravan or use a tent, and a tent doesn't offer any think the same level of comforts.
Anyway. This is my thinking. I use the caravan 99.9% away from a 240v main electrical hook up, so everything is ran from my 2 12v 110amp leisure batteries, therefore power saving is of the highest importance. At the moment I have a 12v-240v inverter which powers a laptop with an external USB TV tuner and an external usb3.0 hard drive with a bunch of media for us to watch. This has worked for the past 12 months but whoever is lieing in bed closest to the laptop kind of blocks the other due to the layout.
What I am thinking of doing is installing a pico-projector above the head of the bed, to go straight down the to the white window screen. Then install a car stereo with an Aux in and stereo speakers for the audio. The screen is 100cm wide by 50cm high, and the projector is roughly 182cm from the screen, but there is a +/- 10cm each way where I can mount it easily. I am aware these projectors are not the brightest but with the blinds down the caravan gets pretty dark anyway and there certainly are not any street lights.
I have been looking at pico-projectors and they mostly have a 240v AC plug which goes to a 12v DC input, so I was thinking there must be a way to wire this in direct without having to go with a 12v-240v inverter to go back down to 12v and get losses in the process of doing that? Obviously the car radio and speakers will be 12v anyway.
My next thinking was how am I going to get media onto it. a USB input that plays the media on my hard drive would be great but I am not sure what I am going to do to get the coax freeview TV signal into it.
Any thoughts, or ideas would be appreciated.