 /* 
 
 Connect the photoresistor one leg to pin 0, and pin to +5V
-Connect a resistor (experimenting 100ohm to 1k seem good) from pin 0 to GND.
+Connect a resistor from pin 0 to GND.
 Need to try in sunlight to get better idea of good resistor value.
 
 ----------------------------------------------------
 
-           PhotoR     1K
+           PhotoR     10K
  +5    o---/\/\/--.--/\/\/---o GND
                   |
  Pin 0 o-----------

    servo_virt.attach(SERVO_PIN_VIRT);
    servo_horz.attach(SERVO_PIN_HORZ);
    
    servo_virt.write(90);
    servo_horz.write(90);
}

void loop()
{
    // Move the panels if needed.
    tkr_move();
    delay(100); 
}

void tkr_move()

#define SERVO_PIN_VIRT 8 // PB0
#define SERVO_PIN_HORZ 9 // PB1

// When the last move was attempted.
unsigned long move_last = 0; 
// The move delay.
const long move_interval = 100; 

Servo servo_virt;
Servo servo_horz;

