1 (MOSI/DI/SDA/!OC1A/PCINT8) PB0 MOSI,SW2 SENSE2+ PA0 (ADC0/DI/SDA/PCINT0)
2 (MISO/DO/OC1A/PCINT9) PB1 MISO,PWM1 SENSE23- PA1 (ADC1/DO/PCINT1)
3 (SCK/USCK/SCL/!OC1B/PCINT10) PB2 SCK,LED2 SENSE3+ PA2 (ADC2/INT1/USCK/SCL/PCINT2)
4 (OC1B/PCINT11) PB3 PWM2 --free-- PA3 (AREF/PCINT3)
7 (ADC7/!OC1D/CLKI/XTAL1/PCINT12) PB4 LED1 SENSE1+ PA4 (ADC3/ICP0/PCINT4)
8 (ADC8/OC1D/CLKO/XTAL2/PCINT13) PB5 PWM3 AMBIENT PA5 (ADC4/AIN2/PCINT5)
9 (ADC9/INT0/T0/PCINT14) PB6 SW1 VBAT_SENSE PA6 (ADC5/AIN0/PCINT6)
10 (ADC10/RESET/PCINT15) PB7 RST VB_SEN_ENA PA7 (ADC6/AIN1/PCINT7)
14 PWM2 - read wide light
22 SW2 - temporary light boost