Reutilization of Christmas Light with broken controller

1int phase1 = 3; //control the left bjts 
2int phase2 = 5; //control  right bjts
3int pot_lum = A1; //Potentiometer for controlling the intensity of  light
4int pot_delay = A2; //Potentiometer for controlling the frequency of switching
5int  val;
6int delay_light;
7
8
9void setup() {
10  pinMode(phase1, OUTPUT);
11  pinMode(phase2, OUTPUT); 
12}
13
14//Only 2 of 4 bjt at any instant are on.  This allow the current to flow in the lights in 2 different direction, alternating  the colors
15void loop() {
16  val = analogRead(pot_lum);
17  delay_light = analogRead(pot_delay);
18  delay_light = delay_light*2;
19  analogWrite(phase1, val/4); //left bjts on
20  digitalWrite(phase2, LOW);  //right bjts off
21  delay(delay_light);         //wait                     
22  digitalWrite(phase1, LOW);  //left bjts off  
23  analogWrite(phase2,  val/4); //right bjts on
24  delay(delay_light);         //wait              
25}