Special pins

1) On-board LED

Each Arduino has an on-board LED connected to one of its pins. HITIPanel indicates which one it is with a dot. On most boards (Uno, Mega, Nano, Leonardo, Micro), it is pin 13. On MKR boards, it is pin 6.
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2) Serial

HITIPanel indicates when hardware serial communication is activated on a pin.
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3) TWI

HITIPanel indicates when TWI / I2C is activated on a pin.
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4) SPI

HITIPanel indicates when SPI is activated on a pin.
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