Add Speech output to Cubetto

Size: (weeks of effort)

Modify the Cubetto firmware to speak each command as the program is run.

The Cubetto robot hardware is based on Arduino and its firmware may be modified using the Arduino IDE.

Repo with Cubetto firmward source code: https://github.com/simonbates/cubetto
- Contains files retrieved from the Google Drive location referenced in the video above: https://drive.google.com/file/d/0B0CGyWe9uilVc0Nycms2QnFJOTg/view
Library suggested by Primo: https://github.com/going-digital/Talkie
An alternative to using a text-to-speech library would be to record and play back samples of the words "forward", "left", "right" – we would store the sample data in the firmware
AudioZero – https://www.arduino.cc/en/Reference/AudioZero play back .wav files from a storage device
Making beeps can be done simply by changing tones in frequency – additional resource for musical notes to frequency conversion http://pages.mtu.edu/~suits/notefreqs.html

The video above says to install support for Genuino Zero (now "Arduino Zero" that the legal battle is resolved between arduino.cc and arduino.org):

Arduino Zero specs:

Microcontroller on Cubetto board says:

"The MKR ZERO brings you the power of a Zero in the smaller format established by the MKR form factor."
https://store.arduino.cc/usa/arduino-mkrzero
https://www.buyapi.ca/product/arduino-mkr-zero-i2s-bus-sd/

The Cubetto operates as before but with the addition of speech output
It is possible that the speaker on the Cubetto board is unable to reproduce speech and an alternative would be to try sounds (beeps) of different patterns and/or pitches