I have come up with a little project the add an audio amplifier to the Raspberry PI which allows Farmbot to provide audio feedback at the head. Great for local confirmation feedback of buttons or reporting progress or errors.
You 'talk though LUA command like this.
send_message("info", "hello Human. I am Farmbot. Surrender now become part of my slave army. ", {"toast", "espeak"})
It runs on 5 Volts, is tiny and fits nicely into the control box.
Would anyone be interested in a kit?