Plug the RFID module into the breadboard with enough space around it. Connect the VCC pin to the Arduino's 3.3V (not 5V), and ...

Reference circuit diagram of an Arduino-compatible LCD backpack is shown below. What follows next is information on how to use one of these inexpensive backpacks to interface with a microcontroller in ...

The transistor serves as a current sink, and its base is connected to Arduino pin 3 (D3) to apply pulse width modulation control. The wiring diagram and sketch for a simple experiment is shown below. ...