unsigned int sensor[10];/*sensor readings are saved here*/ boolean firstData[10];/*to eliminate effect of noise*/ byte sensorPin[10] = {   15, 16, 17, 18, 19, 2, 3, 4, 5, 6 };/*arduino pins to read sensors*/ byte NumOfSensor = 10; byte i; /*just to run for loop!!*/ unsigned int MaxWaitTime = 4096; /*equivalent to 12 bit ADC*/

void setup() {   Serial.begin(9600); } void loop() {   readSensor();   showsensorData(); }


void readSensor() {   for (i = 0; i < NumOfSensor; i++)   {     digitalWrite(sensorPin[i], HIGH);     pinMode(sensorPin[i], OUTPUT);   }   delayMicroseconds(10);   for (i = 0; i < NumOfSensor; i++)   {     pinMode(sensorPin[i], INPUT);     digitalWrite(sensorPin[i], LOW);     sensor[i] = MaxWaitTime;     firstData[i] = false;   }   unsigned long startTime = micros();   while (micros() - startTime < MaxWaitTime)   {     unsigned int time = micros() - startTime;     for (i = 0; i < NumOfSensor; i++)     {       if ((digitalRead(sensorPin[i]) == LOW) && (firstData[i] == false))       {         sensor[i] = time;         firstData[i] = true;       }     }   } }



void showsensorData() {   for (i = 0; i < NumOfSensor; i++)   {     Serial.print(sensor[i]);     Serial.print(" ");   }   Serial.println(); }