The device is very simple and consists of an Arduino microcontroller, a real time clock module DS3231 and small D-class Power Amplifier module with speaker. The code uses "Talkie" library (It is a software implementation of the Texas Instruments speech synthesis architecture from the late 1970s / early 1980s, as used on several popular applications). I got the code from : https://github.com/deladriere/Talking-Clock , and I modified it so that instead of a button, the watch is activated by hand gesture.Note that the code should be compiled with an older version of Arduino Ide, in this case 1.0.6
This device is very useful for people with poor or impaired vision.
Finally, the device is mounted in a suitable housing made of PVC material coated with colored wallpaper