How to Logic Gates Work?

A project with attractive graphics for learning the operation of logic gates for the youngest users in Arduino or electronics

1.Arduino NANO board

2.ST7735 display

3.3xpush buttons

4.LED

5.470 ohm resistor

6.breadboard and jumper wires

7Visuino software

8.IDE Arduino software

• As you can see, the connection diagram is very simple. There is no need for pull up resistors for the buttons, they are made of software. Carefully study the connections of the display to the Arduino board, this being practically the most complicated part of this project.The resistance for the leds varies in the range of 330...560 ohms.

The software is compiled in Visuino, a program that helps you program a controller very easily. You can also use Arduino IDE, the codes are for both programs. As you can see in the video, you can see the logic circuits in the code. The sketch is at the limit of Arduino's memory, for a more complex project a more powerful board like ESP32 is needed.

We make the connections on the breadboard strictly following the connection diagram. You need extra attention when connecting the display, as it has a few more pins. Together with another project, finding out the value of a resistor by reading the color code on it, a project that you can find on my YouTube channel Compact DIY, or Instructables, , you can build a very useful device for those who want to get started in the world of electronics.

We power the device by inserting the USB plug into the Arduino. The AND gate symbol appears on the screen. By pressing the first two push buttons, the two inputs A and B will light up green on the display depending on their position. The output of the logic gate is signaled on the screen in red as well as on the board with the help of the related LED. This LED can be missing, it's optional. We look at the truth table of each logic gate (you can find them on google) and see its operation. Example AND gate. The output LED will light up only when the two inputs A and B are pressed (green) or in 'electronic' language logical level 1 (high). I hope you liked my project, good luck to everyone!