//www.elegoo.com //2016.12.9 int latchPin = 11; int clockPin = 9; int dataPin = 12; byte leds = 0; void updateShiftRegister() { digitalWrite(latchPin, LOW); shiftOut(dataPin, clockPin, LSBFIRST, leds); digitalWrite(latchPin, HIGH); } void setup() { pinMode(latchPin, OUTPUT); pinMode(dataPin, OUTPUT); pinMode(clockPin, OUTPUT); updateShiftRegister(); Serial.begin(9600); while (! Serial); // Wait untilSerial is ready - Leonardo Serial.println("Enter LED Number 0 to 7 or 'x' to clear"); } void loop() { if (Serial.available()) { char ch = Serial.read(); if (ch >= '0' && ch <= '7') { int led = ch - '0'; bitSet(leds, led); updateShiftRegister(); Serial.print("Turned on LED "); Serial.println(led); } if (ch == 'x') { leds = 0; updateShiftRegister(); Serial.println("Cleared"); } } }