Newbie here, questions on this alarm trigger project

hi guys,

got question on whether idea and/or feasible project.

i'm thinking of getting arduino ethernet, have plugged router , draw power ethernet cable.
then somehow tap home alarm trigger, when alarm kicks in, run code.
for i'm planning send email myself starter, later i'm thinking of sending commands cameras , have them start recording stuff...

i'm pretty sure do-able, can tell me whether using arduino ethernet this? know how make trigger? or tap signal wire io input (maybe need resistor triggering input right?)

i'm new arduino, not new programming.

thanks!

i'm no expert on ethernet side, on connection alarm should perhaps consider opto-isolator which make sure alarm signal electrically separated arduino. output isolator normal digital input. code looping forever, reading pin on each pass, , if it's (say) low, kick off appropriate part of code.

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