My most active subscriber asked me to show how to make a calculator with circuits and so I begin that journey with this video. To make a calculator you need to understand Transistors as well as Transistor Gates. I make 4 circuits, one to demonstrate how transistors work as well as NOT, OR 7 AND Gates. The designs can be found below along with the code I used in this video.

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Circuits Used

Code from the Video

const int voltBeforeTranIN = A1;
const int voltAfterTranIN = A0;

void setup(){
  Serial.begin(9600);

}

void loop(){
  int beforeTranVal = analogRead(voltBeforeTranIN);
  float beforeVoltage = beforeTranVal * (5.0 / 1023.0);
  Serial.print("Before Transistor : ");
  Serial.println(beforeVoltage);

  int afterTranVal = analogRead(voltAfterTranIN);
  float afterVoltage = afterTranVal * (5.0 / 1023.0);
  Serial.print("After Transistor : ");
  Serial.println(afterVoltage);
  Serial.println();
  
  delay(500);
}