Most common RFID tags are passive. They have no power source. They sit there, waiting for a reader to activate them with radio waves. They reflect back ...
RS485 uses a pair of wires for sending data. One wire carries the main signal, while the other carries its inverse...This method reduces interference...
Real time pressure monitoring in IoT systems is a mix of sensors, data processing, and communication tech for water, oil & gas, manufacturing and HVAC...