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The red LED is connected to the pin labeled RXL (usable as Arduino pin 17), or PB0, and lights when the pin is driven low. While the board is running the A-Star 32U4 Bootloader or a program compiled in the Arduino environment, it will flash this LED when it is transmitting data via the USB connection. The green LED is connected to the pin labeled TXL, or PD5, and lights when the pin is driven low. The A-Star 32U4 Bootloader fades this LED on and off while it is waiting for a sketch to be loaded. You can drive this pin high in a user program to turn this LED on. The yellow LED is connected to Arduino pin 13, or PC7. The A-Star 32U4 Mini has three indicator LEDs. Printed on the A* circuit board are indicators that you can use to quickly identify each pin’s capabilities: a triangle next to the pin means it can be used as an analog input, and a square wave symbol under the pin number means it can be used as a PWM output. For more information about the ATmega32U4 microcontroller and its peripherals, see Atmel’s ATmega32U4 documentation.
#Arduino mini usb adapter pinout pdf#
This diagram identifies the I/O and power pins on the A-Star 32U4 Mini (ULV, LV, and SV versions) it is also available as a printable PDF (223k pdf).