(MOSI/DI/SDA/!OC1A/PCINT8) PB0 MOSI,LED1   SENSE1+ PA0 (ADC0/DI/SDA/PCINT0)
          (MISO/DO/OC1A/PCINT9) PB1 MISO,PWM1  SENSE12- PA1 (ADC1/DO/PCINT1)
   (SCK/USCK/SCL/!OC1B/PCINT10) PB2 SCK,LED2    SENSE2+ PA2 (ADC2/INT1/USCK/SCL/PCINT2)
                 (OC1B/PCINT11) PB3 PWM2            SW2 PA3 (AREF/PCINT3)
                                VCC                     AGND
                                GND                     AVCC
(ADC7/!OC1D/CLKI/XTAL1/PCINT12) PB4 LED3         SENSE5 PA4 (ADC3/ICP0/PCINT4)
 (ADC8/OC1D/CLKO/XTAL2/PCINT13) PB5 PWM3        SENSE3+ PA5 (ADC4/AIN2/PCINT5)
         (ADC9/INT0/T0/PCINT14) PB6 SW1        SENSE34- PA6 (ADC5/AIN0/PCINT6)
          (ADC10/RESET/PCINT15) PB7 RST         SENSE4+ PA7 (ADC6/AIN1/PCINT7)


Lights:
1 - front light
2 - rear spotlight
3 - rear LED strip

PWM1
PWM2
PWM3
SENSE1 - light 1
SENSE2 - light 2
SENSE3 - light 3
SENSE4 - ambient light sensor
SENSE5 - battery voltage sense
SW1 - mode switch
SW2 - temporary light boost or whatever
LED1 - speedometer illumination LED
LED2 - status LED


ADC
single-ended resolution:
0.00107 V .. 1.1 V
differential resolution 8x gain:
0.00013 V .. 0.1375 V
differential resolution 20 gain:
0.000054 .. 0.055 V
differential resolution 32x gain:
0.000036 .. 0.03438 V
analog input resistance 100 MOhm

LED current sense, 0.033R sensing resistor:
                       min gain max gain
   20 mA => 0.00066 V               8x
  100 mA => 0.0033 V
  150 mA => 0.0050 V
  300 mA => 0.0099 V
  350 mA => 0.0116 V
  700 mA => 0.0231 V
 1000 mA => 0.0330 V   32x
 1500 mA => 0.0495 V   20x         0.0495 W
 2000 mA => 0.0660 V    8x         0.066 W
 3000 mA => 0.0990 V    8x         0.1 W

Battery sense
range 5-15 V
1.5M..15k
cca 10  uA @15V
    3.3 uA  @5V

Ambient light sense
20 lx -- cca 333 kOhm
200 lx -- cca 35 kOhm

lx:
1lx == full moon
400 lx == sunset/sunrise
10 klx == full daylight

need probably 1-1k lux scale

Photodiode:
5 V, 1M5 resistor + photodiode: voltage at the photodiode
darkness: 3.71 V => 4.31 MOhm
bathroom without lights, only outside lights: 3.68 V => 4.18 MOhm
kitchen light: 3.29 V => 2.89 MOhm
bathroom halogen lights 0.02 V => 6 KOhm
battery light: 0.01 V => 3 KOhm