Simple Robot AI System

A fairly simple concept, here is the code I used:

if this:first_run() then
x = 1
end

if this:read(0) == 1 then
x = .8
elseif this:read(1) == 1 then
x = .9
elseif this:read(2) == 1 then
x = .7
elseif this:read(3) == 1 then
x = .6
else
x = 1
end

this:write_frequency(1,x)