https://gr33nonline.wordpress.com/wp...rf-pinout1.jpg

https://images.theengineeringproject...-ams1117-2.png

#define sync_pin 2 //sync button
#define data_pin 3 //data line
#define clock_pin 4 //clock line

int led_cmd[10] = {0,0,1,0,0,0,0,1,0,0}; //Activates/initialises the LEDs, leaving the center LED lit.
int anim_cmd[10] = {0,0,1,0,0,0,0,1,0,1}; //Makes the startup animation on the ring of light.
int sync_cmd[10] = {0,0,0,0,0,0,0,1,0,0}; //Initiates the sync process.

int previousState = HIGH;
unsigned int previousPress;
volatile int buttonFlag;
int buttonDebounce = 20;

void sendData(int cmd_do[]) {
pinMode(data_pin, OUTPUT);
digitalWrite(data_pin, LOW); //start sending data.
int prev = 1;
for(int i = 0; i < 10; i++){

while (prev == digitalRead(clock_pin)){} //detects change in clock
prev = digitalRead(clock_pin);
// should be after downward edge of clock, so send bit of data now
digitalWrite(data_pin, cmd_do[i]);

while (prev == digitalRead(clock_pin)){} //detects upward edge of clock
prev = digitalRead(clock_pin);
}
digitalWrite(data_pin, HIGH);
pinMode(data_pin, INPUT);
}

void initLEDs(){
sendData(led_cmd);
delay(50);
sendData(anim_cmd);
delay(50);
}

void syncButtonPressed () {

buttonFlag = 1;
}

void setup() {
Serial.begin(9600);
pinMode(sync_pin, INPUT);
digitalWrite(sync_pin,HIGH);
pinMode(data_pin, INPUT);
pinMode(clock_pin, INPUT);
attachInterrupt(sync_pin, syncButtonPressed, CHANGE);
delay(2000);

initLEDs();
}

void loop(){

if((millis() - previousPress) > buttonDebounce && buttonFlag)
{
previousPress = millis();
if(digitalRead(sync_pin) == LOW && previousState == HIGH)
{
Serial.println("Syncing.");
sendData(sync_cmd);
previousState = LOW;
}

else if(digitalRead(sync_pin) == HIGH && previousState == LOW)
{
previousState = HIGH;
}
buttonFlag = 0;
}

}