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Google is your friend. There are many resources on building a line following robot and several with a pic16f877 Content in “16f877” | Let's Make Robots!
What are you doing with the data from the embedded system? Are you writing it to disk, passing it to an application running on the PC? How are you getting the data from telnet to your desired destination?
I had a similar problem. I wanted to convert an audio signal to 0-5VDC signal, which was then processed by a µP in order to control a servo motor. Here is my thread
You have changed the input amperage again... The same calculations we have shown you still apply.
100 volt and 200 ma = 100*.2 = 20 watts
12 volt @ 2 a = 12 * 2 = 24 watts
Fairly close and if the input is 120 volts (typical US mains voltage), you get 24 watts in and 24 watts outs. The laws of...
120 volt and 20ma gives you 120 * .020 = 2.4 Watts
12 volt and 2A requires 12 * 2 = 24 Watts
Like alexan said - you cannot create energy from thin air.
You might get close if you had 120 volts at 200ma...
I would investigate the use of shift registers; particularly a parallel load serial out shift register like a 74HC165. Download the datasheet and take a look at the pinouts - from there you should be able to easily create a circuit to do what you are asking.
Single Pole Double Throw -Center off switch... You don't need a rotary switch... You might also be able to find a single pole, triple (or greater) throw switch that would work for you as well.
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