Using arduino to control leds as a pattern - arduino

Question

I have this code here which sends some keys to windows and also lights up an led attached under each button. I think its right so the led will toggle with the button. What I wanted to achieve ontop of this was so that if no button states hadn't changed for 30 seconds then it goes into a mode where all three leds flash rapidly 3 times then the leds randomly flashes (Like a pinball machine when its not in use). After any input then it goes back to the normal mode
/* Arduino USB Keyboard HID demo
* Cut/Copy/Paste Keys
*/
#define KEY_LEFT_CTRL 0x01
#define KEY_LEFT_SHIFT 0x02
#define KEY_RIGHT_CTRL 0x10
#define KEY_RIGHT_SHIFT 0x20
uint8_t buf[8] = {
0 }; /* Keyboard report buffer */
#define PIN_COPY 5
#define PIN_CUT 6
#define PIN_PASTE 7
#define LED_COPY 8
#define LED_CUT 9
#define LED_PASTE 10
int state = 1;
void setup()
{
Serial.begin(9600);
pinMode(PIN_COPY, INPUT);
pinMode(PIN_CUT, INPUT);
pinMode(PIN_PASTE, INPUT);
// Enable internal pull-ups
digitalWrite(PIN_COPY, 1);
digitalWrite(PIN_CUT, 1);
digitalWrite(PIN_PASTE, 1);
delay(200);
}
void loop()
{
state = digitalRead(PIN_CUT);
if (state != 1) {
buf[0] = KEY_LEFT_CTRL; // Ctrl
buf[2] = 27; // Letter X
// buf[2] = 123; // Cut key: Less portable
Serial.write(buf, 8); // Ssend keypress
digitalWrite(LED_CUT, HIGH);
releaseKey();
}
state = digitalRead(PIN_COPY);
if (state != 1) {
buf[0] = KEY_LEFT_CTRL; // Ctrl
buf[2] = 6; // Letter C
// buf[2] = 124; // Copy key: Less portable
Serial.write(buf, 8); // Send keypress
digitalWrite(LED_COPY, HIGH);
releaseKey();
}
state = digitalRead(PIN_PASTE);
if (state != 1) {
buf[0] = KEY_LEFT_CTRL; // Ctrl
buf[2] = 25; // Letter V
// buf[2] = 125; // Paste key: Less portable
Serial.write(buf, 8); // Send keypress
digitalWrite(LED_PASTE, HIGH);
releaseKey();
}
}
void releaseKey()
{
buf[0] = 0;
buf[2] = 0;
Serial.write(buf, 8); // Release key
delay(500);
digitalWrite(LED_COPY, LOW);
digitalWrite(LED_CUT, LOW);
digitalWrite(LED_PASTE, LOW);
}
For refrence this is the article I was using http://mitchtech.net/arduino-usb-hid-keyboard/

Answer 1

i recomend you to look for Finite State Machine in Google.
Here is one link to implement it in C++
http://www.drdobbs.com/cpp/state-machine-design-in-c/184401236
here is other link to implement it in Arduino
http://playground.arduino.cc/Code/SMlib
it's exactly what you need to do what you want.
i hope this help you!