Logic Gates Identifier

Question

I want to build a program which identifies logic gates connected to Arduino, by testing the output with changing the input voltage...

Here is the code:

int output1 = 0; //Change output pins HERE 
int output2 = 1; //and HERE 
int input = 2; //Change the input pin HERE, where we will read the data (0 or 1) 
void setup() { 
 pinMode(output1, OUTPUT); 
 pinMode(output2, OUTPUT); 
 pinMode(input, INPUT); 
 Serial.begin(9600); // Start serial communication at 9600 bps 
}
void loop() { 
 int result[12]; 
 for(int i = 0; i < 2; i++) // For failure test, it runs 3 times 
 { 
 digitalWrite(output1, LOW); 
 digitalWrite(output2, LOW); 
 delay(1000); //Wait for 1sec 
 result[i * 4] = digitalRead(input); 
 digitalWrite(output1, LOW); 
 digitalWrite(output2, HIGH); 
 delay(1000); //Wait for 1sec 
 result[i * 4 + 1] = digitalRead(input); 
 digitalWrite(output1, HIGH); 
 digitalWrite(output2, LOW); 
 delay(1000); //Wait for 1sec 
 result[i * 4 + 2] = digitalRead(input); 
 digitalWrite(output1, HIGH); 
 digitalWrite(output2, HIGH); 
 delay(1000); //Wait for 1sec 
 result[i * 4 + 3] = digitalRead(input); 
 } 
 if(result[0] != result[4] && result[0] != result[8] && result[1] != result[5] && result[1] != result[9] && result[2] != result[6] && result[2] != result[10] && result[3] != result[7] && result[3] != result[11]) // See if the results don't matches... 
 { 
 Serial.println("Input read error, please try again!"); 
 } 
 if(result[0] == 0 && result[1] == 0 && result[2] == 0 && result[3] == 1) // AND gate 
 { 
 Serial.println("This is an AND gate"); 
 } 
 else if(result[0] == 0 && result[1] == 1 && result[2] == 1 && result[3] == 1) // OR gate 
 { 
 Serial.println("This is an OR gate"); 
 } 
 else if(result[0] == 1 && result[1] == 1 && result[2] == 1 && result[3] == 0) // NAND gate 
 { 
 Serial.println("This is a NAND gate"); 
 } 
 else if(result[0] == 1 && result[1] == 0 && result[2] == 0 && result[3] == 0) // NOR gate 
 { 
 Serial.println("This is an NOR gate"); 
 } 
 else if(result[0] == 0 && result[1] == 1 && result[2] == 1 && result[3] == 0) // EXOR gate 
 { 
 Serial.println("This is an EXOR gate"); 
 } 
 else if(result[0] == 1 && result[1] == 0 && result[2] == 0 && result[3] == 1) // EXNOR gate 
 { 
 Serial.println("This is an EXNOR gate"); 
 } 
 else // If there is no match... 
 { 
 Serial.println("This is not even a gate"); 
 } 
} 

It always gives back 1s... I have tested with leds, it works perfectly by changing the input, but as soon as serial.begin is declared in setup, it fails to work, the just stays on and I said, the program just gives back 1s.

What I'm missing?

Thanks!

Answer 1

Arduino uses pins 0 and 1 for Serial. Use other pins in your sketch