Bluetooth doorbell is an advance doorbell which shows your image to the person standing at another side of this bell. This doorbell is made already! You can buy a wireless doorbell in any hardware store. However, this one you make yourself! Even better, as you get more confident with Arduino, you can modify it to make it uniquely yours. For instance, what if your Arduino triggers a music player instead of a buzzer to let you know that someone has pressed the button. This is very useful devices for home use. Left side of figure 1 shows the doorbell button, and right side of figure 1 shows the buzzer unit that is tucked away on a shelf inside. Figure 1(a) The doorbell awaits visitors! (b) The buzzer unit sits discreetly on a shelf. Parts Required: In this project, one Arduino waits for a button press, while the other one sets off a buzzer when it detects that the button has been pressed. 2 Arduino Unos 2 XBee wireless modules (Adafruit P/N 128) 2 Adafruit XBee bre...