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int currentLed = 0; void setup() { Serial.begin(19200); pinMode(12, OUTPUT); pinMode(13, OUTPUT); pinMode(14, OUTPUT); pinMode(15, OUTPUT); currentLed = 0; } void tristate(int pin) { pinMode(pin,OUTPUT); digitalWrite(pin,LOW); pinMode(pin,INPUT); } void power(int pin) { pinMode(pin,OUTPUT); digitalWrite(pin,HIGH); } void ground(int pin) { pinMode(pin,OUTPUT); digitalWrite(pin,LOW); } void enableRowCol(int row, int col) { Serial.print("enabling "); Serial.print(row); Serial.print(" "); Serial.println(col); if (row==0) { power(12); ground(13); } else { ground(12); power(13); } if (col==0) { ground(14); tristate(15); } else { tristate(14); ground(15); } } void loop() { Serial.print("current led "); Serial.println(currentLed); enableRowCol(currentLed/2,currentLed%2); currentLed = (currentLed+1)%4; delay(10); }
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