tx.ino

//                             +-\/-+
//                  (+)  VCC  1|    |14  GND (-)
//             coil 1    A00  2|    |13  A10  low_pin
//             coil 2    A01  3|    |12  A09  high_pin
//                     RESET  4|    |11  A08  
//             coil 3    A02  5|    |10  A07  button_input
//                       A03  6|    |9   A06  led_cathode
//                       A04  7|    |8   A05  led_anode
//                             +----+
int low_pin = 10;
int high_pin = 9;
int button_input = 7;
int led_anode = 5;
int led_cathode = 6;

void setup() {
  pinMode(0, OUTPUT);  pinMode(1, OUTPUT);  pinMode(2, OUTPUT);

  // used for led
  pinMode(led_anode, OUTPUT); digitalWrite(led_anode, LOW); 
  pinMode(led_cathode, OUTPUT); digitalWrite(led_cathode, LOW); 

  // button 
  pinMode(button_input, INPUT);  
  pinMode(low_pin, OUTPUT);  digitalWrite(low_pin, LOW); 
  pinMode(high_pin, OUTPUT); digitalWrite(high_pin, HIGH); 
}

int on_time = 25; //in ms
int refresh_rate = 1; // per second
int pins = 3;
int off_time = (1000 / (refresh_rate * (pins + 1))) - on_time; //in ms (1: 225/25 2:100/25)

void loop() {
   for (int pin = 0; pin <= pins; pin++) {
    digitalWrite(pin, HIGH);
    delay(on_time);
    digitalWrite(pin, LOW); 
    delay(off_time);
   }

  if (digitalRead(button_input) == HIGH) {
     on_time = on_time + 5;
     off_time = (1000 / (refresh_rate * (pins + 1))) - on_time; //in ms
     int blink_num = on_time / 5;
     for (int i = 0; i < blink_num; i++) {
       digitalWrite(led_anode, HIGH);   // turn the LED on (HIGH is the voltage level)
       delay(50);              // wait for a second
       digitalWrite(led_anode, LOW);    // turn the LED off by making the voltage LOW
       delay(200);
     }
  }

}