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unsigned int EchoPin = 2; // connect Pin 2(Arduino digital io) to Echo at US-015
unsigned int TrigPin = 3; // connect Pin 3(Arduino digital io) to Trig at US-015
unsigned long Time_Echo_us = 0;
unsigned long Len_mm = 0;
void setup()
{ //Initialize
Serial.begin(9600); //Serial: output result to Serial monitor
pinMode(EchoPin, INPUT); //Set EchoPin as input, to receive measure result from US-015
pinMode(TrigPin, OUTPUT); //Set TrigPin as output, used to send high pusle to trig measurement (>10us)
}
void loop()
{
digitalWrite(TrigPin, HIGH); //begin to send a high pulse, then US-015 begin to measure the distance
delayMicroseconds(20); //set this high pulse width as 20us (>10us)
digitalWrite(TrigPin, LOW); //end this high pulse
Time_Echo_us = pulseIn(EchoPin, HIGH); //calculate the pulse width at EchoPin,
if((Time_Echo_us < 60000) && (Time_Echo_us > 1)) //a valid pulse width should be between (1, 60000).
{
Len_mm = (Time_Echo_us*34/100)/2; //calculate the distance by pulse width, Len_mm = (Time_Echo_us * 0.34mm/us) / 2 (mm)
Serial.print("Present Distance is: "); //output result to Serial monitor
Serial.print(Len_mm, DEC); //output result to Serial monitor
Serial.println("mm"); //output result to Serial monitor
}
delay(1000); //take a measurement every second (1000ms)
}

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