Programmable Phone Ringer
Fall 2006
Team Members:
Project Description:
The Programmable phone ringer is a product that will allow the customer to download unique ring tones onto the device. The advantage of this is that the customer can distinguish which phone is ringing by the unique ring tone. The device will interface with a PC through a serial port and accept a .wav file as the ring-tone.
Engineering Constraints:
The engineering constraints that were most important to this
project were the cost of the design, the size of the printed circuit board,
reliability of the finished product, and the FCC regulation on the input
impedance of the phone line. We addressed the design cost by selecting devices
that all operated at a single voltage so we did not need as much power
regulation circuitry. We also used inexpensive components and a low cost,
highly integrated, micro-controller. The size of the printed circuit board was
addressed by using a smaller speaker, and reducing the number of peripheral devices
by using a micro-controller that doesn't require a lot of them. Using a proven
micro-controller and using FLASH memory, which will retain data in the event of
power loss to the board, ensured the reliability of the design. The FCC
regulation on the input impedance of the phone line was met by using a significant
RC network circuit in the ring detector portion of the design.
Faculty Advisor:
Sponsors:
