Measurement

HW:

Playing ‘Wedding March’ takes 5V*(13mA → 20 mA)=0.065W → 0.1W

#include "pitches.h"

int melody[]={
  NOTE_C4, NOTE_B3,NOTE_FS3, NOTE_A3, NOTE_G3,NOTE_F3,NOTE_D3,NOTE_C3,NOTE_B2,NOTE_C3,NOTE_E3,NOTE_D3,NOTE_D3,NOTE_C3,NOTE_C3
  };

  int noteDurations[]={2,2,8,4,4,4,4,4,8,8,2,8,4,4,2};
void setup(){
  
  }

 void loop(){
   for(int thisNote=0;thisNote<15;thisNote++){
    int noteDuration=1000/noteDurations[thisNote];
    tone(8,melody[thisNote],noteDuration);
    delay(noteDuration+30);
   }
  }

Class Note:

TC: heat → electricity

Hans Free Electric

Solar: photovoltaic

Solar thermal instead of PV? Regions matter

Indirect solar light interior

Fishermen in Kenya attracting shrimp w/ solar charged lights (remote areas)

Rated performance, open circuit voltage, short circuit current, cost/watt (efficiency calculation)

NREL

Solar constant at Earth Orbit: 1367 W/m2

Solarbotics, Mark Tilden