namely, I want to do a video welcome in the hall, on the motion sensor. write it own .avi movie I have seen the PI is interactive with the watch, weather, etc. but if I can write it there a video Is right as well ? Cause I have to be sure before I buy pi and with one model pi is the best fore my solution ?

Hi actually I bought venetian mirror 640 x 500 mm with one way will be the best for play my own clip with my greeting when motion detector take signal ?

1. Take screen from monitor PC 21 inches and connect with tablet ,phone or other better solution you know
2. What the program will be the best for my idea
   3.how to connect motion detector with tablet or phone ?