hi i am a yr12 student studying systems engineering and would like some help with a project that i would like to put together. i plan on making a letterbox that tells the home owner when they have mail.
i think I'm going to do this buy using an LDR (light dependent resistor) or motion sensor (undecided) to detect movement/light when the letter box door is opened. once the LDR/motionsensor has detected movement/light, a transmitter will send a radio frequency to a receiver inside the house. from there i was going to either use a servo to mechanically flick a switch which activates a simple LED circuit to notify the user of mail, or i was told i could use a micro controller.
i only know the basics of electronics but i have put together several medium skilled kits. anyone out there that could help me would be really cool
what I'm really looking for is a list of components that i would need to purchase at a hobby store or electronics department store, and at most a quick sketch of some schematics that i could follow.
the pat that I'm struggling with the most is the whole making it wireless idea. i dont want any leads running from the letter box and into the house.
i know I'm asking for alot out of this post but it would be really awsome if someone out there could help! thank you