somebody can tell the mean.

int ultrasoundsignalpins[] = {0,1}; // 2 ultrasound signal pins
int ultrasoundtriggerpin = 6;        // output pin start ultrasound signals
int pwm_a = 3;
int pwm_b = 11;
int dir_a = 12;
int dir_b = 13;
unsigned char analogpin = 0;

void setup() {
   
   serial.begin(9600);
   for(int i=0; < 2; i++) {
   pinmode(ultrasoundsignalpins, input); // switch signalpin input
   }
   pinmode(ultrasoundtriggerpin, output); // set pin output
  //give sensors time boot
   delay(250);
   // send rx pin high signal chain ping
   digitalwrite(ultrasoundtriggerpin, high);
   delaymicroseconds(30);
   digitalwrite(ultrasoundtriggerpin, low);
   pinmode(ultrasoundtriggerpin, input); // electrically disconnects pin
   delay(50);








this not unstander ?
what means.


serial.begin(9600);
   for(int i=0; < 2; i++) {
   pinmode(ultrasoundsignalpins, input); // switch signalpin input
   }
   pinmode(ultrasoundtriggerpin, output); // set pin output
  //give sensors time boot
   delay(250);
   // send rx pin high signal chain ping
   digitalwrite(ultrasoundtriggerpin, high);
   delaymicroseconds(30);
   digitalwrite(ultrasoundtriggerpin, low);
   pinmode(ultrasoundtriggerpin, input); // electrically disconnects pin
   delay(50);

two things
1) go post hitting modify, select code, hit # icon , save.
2) can point out don't understand in code. serial.begin under arrow mistake, should removed.

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