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Space ship Stability system

I decided to design a stability system for space ships.

The motion sensors send out a signal on the side that they move towards.

AND gates are logic components with two inputs and one output. The output only puts out a signal if both inputs are signals.

You can think of it like a pipe with two valves in a row- water only comes out if both valves are open.

This is the 'Truth Table' for an AND gate. 1 means that there's a signal, and 0 means that there isn't.

input 1    input 2   output

0                 0             0
1                 0             0
0                 1             0
1                 1             1

Polarity Detector

You have a battery (you peeled the labels off, for reasons only you know). You are about to put it in your camera, but suddenly doubt falls over you. Which side is positive, and which is negative? With no label, you will never know.

Or will you?

Introducing the  
Polarity Detector! 

Just attach the electrodes to your battery and a light will light up on the positive side! great!

This is how it works:

Ion Thruster

Building an ion thruster has been a goal of mine for a couple of years, and now I'm actually trying to finish it.

This is the link for my ion thruster blog: Thruster Blog