Radio or wi-fi motion detector
I would like to build (from easily available materials) an outside motion detector that would alarm if anyone came into my carport at night. Battery powered (do not want to have to do house wiring), motion or ir sensitive (whichever gives range), sits somewhere outside in carport and when activated broadcasts signal to turn on buzzer or other warning device in house bedroom, 100 ft or so away from detector.
I do have an available electrical plug in the carport so I could use that for power instead of batteries if needs be.
Does this stimulate anyone's creative juices?