Help with 2x2 matrix button board

Using Arduino Programming Questions
17

We are working on just the buttons right now, we will leave the LEDS for later.

If your version has the so-called "isolation diodes" then we must reverse the polarity of the sense:

void setup() 
{	
	pinMode(buttonMatrix1, INPUT);   // Button sense
	pinMode(buttonMatrix2, INPUT);   // external pull-down may be required
	pinMode(buttonMatrix3, INPUT);
	pinMode(buttonMatrix4, INPUT);

	pinMode(SwitchPin, OUTPUT);     // Button Common  
	digitalWrite(SwitchPin, HIGH);
}
void loop() 
{
	Serial.print(analogRead(buttonMatrix1));
	Serial.print("\t");
	Serial.print(analogRead(buttonMatrix2));
	Serial.print("\t");
	Serial.print(analogRead(buttonMatrix3));
	Serial.print("\t");
	Serial.println(analogRead(buttonMatrix4));
	delay(200);
}

Cheers,
John