I had to run a sketch (BareMinimum) on the Arduino to enable me to open the serial monitor. I put into the Send box, $, then $ $ - nothing happened. Connection is fine using the UGS (GUI ), so ...

The project consists of an Arduino Uno R3, a resistor, an LED and four temperature sensors. (Temperature sensors were used as Tinkercad does not have pressure sensors). The main application of this ...