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I want to design a PCB board computer that is very similar to a raspberry pi or an Orange Pi. It needs to have no ports aside from Ethernet. It should plug directly into an electrical outlet and have have another electrical outlet on the other side of it that can works just like a normal port outlet. On the board I want to have a switch that cuts off the power to the other power outlet but the computer is still powered.

Would this be expensive to manufacture?

Would it be expensive to hire someone to design it for me?

sorry if this may be off topic, but if you could point me in a direction where I can learn more please do :)

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closed as too broad by Ignacio Vazquez-Abrams, Andy aka, Bimpelrekkie, Leon Heller, m.Alin Nov 29 '16 at 10:13

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    \$\begingroup\$ Why do you need a full computer instead of a microcontroller? \$\endgroup\$ – Ignacio Vazquez-Abrams Nov 29 '16 at 6:46
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    \$\begingroup\$ What do you consider "expensive" ? I often find this to be true: if you have to ask what it costs then probably you cannot afford it. Why not use an Rpi or Opi and only make an additional board with the mains switching and the Ethernet stuff (assuming that would even be needed). \$\endgroup\$ – Bimpelrekkie Nov 29 '16 at 6:51
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    \$\begingroup\$ $1500 is less than two days. I don't think that is enough time to do the job. Not if you need full schematic and layout. I am ignoring "bulk" because I doubt you could sell more than 100 of these. So the $30 also probably cannot be realized. If you can sell 100,000 units, then you can maybe get a bulk price. Injection molded plastic tooling is also way more expensive than you probably think. Even a small part will have thousands of dollars of tooling cost. And you will need a lot of compliance tests to be done. I think there is much more NRE than you expect. \$\endgroup\$ – mkeith Nov 29 '16 at 6:58
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    \$\begingroup\$ Do you have a working prototype already ? It will be a lot easier and less risky (saving money) to go to a custom design if you already have working hardware. I'm thinking an Rpi or Opi board with an additional PCB with the special hardware you need. \$\endgroup\$ – Bimpelrekkie Nov 29 '16 at 6:58
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    \$\begingroup\$ @mkeith "$1500 is less than two days" That amount varies a lot, depending on the country the consultant/designer is in. I, for example, living in Eastern Europe, would be willing to work for two weeks for that money. On the other hand, I agree that $30 per unit is not a realistic goal. \$\endgroup\$ – m.Alin Nov 29 '16 at 8:46
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You start off by buying a few mains networking widgets with through sockets, something like the BT Broadband Extender Flex 1000 kit (other fine networking products are available), which sounds like it has most of the features you are after.

Then you pull one apart, and find out what it is built from, and why it costs what it does. You operate another, to see what it does 'as is'. You hack a third, install linux on it, add a relay for the mains output etc. That's called research.

Thus informed, you can then go to a design house with real specifications and a stab at a bill of materials.

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