Info : when you check this diagram you can be confused about how switches works in practical way. "OR"- and "AND"-gates present 1 in truth table when switch is off ( not electricity flow) and 0 switch ...

Interfacing 16x2 LCD with Arduino Let’s see how to connect the LCD module to Arduino. For that first, connect the VSS to the GND and VDD to the 5V. To use the LCD backlight, connect the backlight ...

My schematics also allows verifying step by step: attach the Arduino board to the LCD and see if displays OK, and after go into the buttons and the radio part. Alexander’s version was very ambitious ...