Good show.  Beat me to it...I have show notes for three shows about Arduino, just need to do the recordings.

Just a note about 3v3 on the Arduino board.  This is not a typo; it is common practice in electronics to replace the decimal point with the unit.  So 3v3 is 3.3 volts, 2n2 stamped on a capactor or on a circuit diagram is 2.2 nano-Farads and 4k7 against a resistor on a circuit diagram is 4.7 kilohms.

My Arduino shows were going to be about the command-line tools available for programming.

I will wait and see what your next show(s) contain so I don't duplicate your great efforts