If you’d like to add your own LED, you can move the built-in LED’s pin to one of the other numbered ones, or leave it at 13, plugging your new LED’s longer leg into whatever pin you choose.

Arduino textile flex sensor concept 9:16 am April 13, 2021 By Julian Horsey ...

The sensor shown here is essentially two plates mounted side-by-side, attached to an Arduino Nano using the Capacitor library which uses just two pins, one digital and one analog.

Note: If the /ttyACM* port is not available, here are several reasons why Modem manager is using the port. When the port becomes active, modem manager can claim the port, blocking the IDE's access ...

As you can see in the schematic all three TC74 sensors have their SDA and SCL pins connected in series to pin A4 and A5 on the Arduino board. The two 4.7K pull-up resistors must be used when using I2C ...