If you only want to use A1 as an output, you might not need to cut that jumper. If you want to use this pin as a digital or analog input, you might need to cut the surface-mount jumper labeled “A1 = BATLEV” in order to disconnect it from the on-board voltage divider. This pin can be used for digital input and output, as well as analog input. If you do not need the AVR to be able to measure the battery voltage, you can use pin A1 (19/PF6) for other purposes. If the free I/O pins are not sufficient for connecting the devices you want to connect, you might need to disable or disconnect some of the other features of the Romi 32U4 Control Board to free up more I/O pins.
Pin 12 (A11/PD6) can also be used as a PWM output, but it is not supported by analogWrite(), and using pin 12 for PWM might conflict with uses of pin 6 (which controls the buzzer by default) as these two pins are complementary outputs of Timer4 channel D. Pin 5 (PC6) is a hardware PWM output and is usable with the Arduino analogWrite() function.
ARDUINO ANALOGWRITE MULTIPLE PINS SERIAL
Pin 0 (PD2) and pin 1 (PD3) are the RX and TX lines of the AVR’s TTL serial port. Any of the free I/O lines can be used as basic digital inputs or outputs each pin also has some special capabilities.
Many of the I/O pins are already being used for some other purpose on the board, but there are 8 free I/O pins: 0, 1, 5, 12, A0, A2, A3, and A4. The pin assignment table in Section 3.8 lists all of these pins and how they are used. If you want your additional devices to send or receive information from the AVR, you will need to connect them to one or more of the AVR’s I/O pins. This section gives tips for how additional electronics can be connected to the Romi 32U4 Control Board.
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