I am currently building a “baby phone” toy for my son based on a discarded landline phone enclosure. The toy will feature record and playback on SD card to allow family members to record messages on the device. Voice messages would be played back when pressing a key of the original phone keyboard.
The plan has been to reuse as much of the old phone as possible : speaker, microphone, keyboard.
The prototyping began on a Teensy2 board starting from my previous WAV player project. It has now moved on an ATmega328 because USB Mass Storage is not required and I want to keep my Teensy for other projects.
Hardware is done. Software is almost done. I am now soldering the design on a veroboard to fit it inside its final case.
More details and pictures to come…