error: expected unqualified-id before 'if' XC4442 Ultrasonic sensor Arduino UNO

Projects Programming
1

Hi thank you everyone who can help i cant seem to figure out what is wrong with my if statement. I have attached the code

I hope you guys can help it is for school project :slight_smile:

if any more information needed please comment ill try and respond as fast as I can

thank you SO MUCH!

// Ultrasonic HC-SR04 unit interface
// Uses serial port at 115200 baud for communication
// use trig pin for output, echo pin for input
// pulse out (10us) on trig initiates a cycle
// pulse width returned on echo is proportional to distance
// specs say 38ms = no return (beyond limit), but 90ms and more have been seen
// set utimeout when calling usonic (routine will take longer for longer returns)
// higher timeout measures further, but can take longer if no echo
// if return >= utimeout, no valid pulse received
// if return < ~100 unit is faulty/disconnected (routine is timing out waiting for start)
// if return == 0 then unit is still sending return from last ping (or is faulty)
// maximum nominal range is 5m => utimeout = 29000 us
// call usonicsetup() during setup
// call usonic(timeout) to get return time in microseconds
// divide result of usonic by 58 to get range in cm


#define TRIG 3
#define ECHO 2
#define USMAX 3000 
int led2=A0;
int led4=A1;
int led6=A2;
int led8=A3;
int led10=A4;


void setup()
{
  Serial.begin(115200); 
  
 usonicsetup();
  

  
  
  
  pinMode(led2, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(led6, OUTPUT);
  pinMode(led8, OUTPUT);
  pinMode(led10, OUTPUT);
  
  digitalWrite(led2, LOW);
  digitalWrite(led4, LOW);
  digitalWrite(led6, LOW);
  digitalWrite(led8, LOW);
  digitalWrite(led10, LOW);
  
  delay(1000);
}

void loop()
{
 int distance; 
 distance=usonic(11600)/58; //distance in cm, time out at 11600us or 2m maximum range
 Serial.println(distance); //distance in cm
 delay(10000); // how long between differnt sonar scans 1000 = 1 sec
  
}
 void usonicsetup(void)
 {
 pinMode(ECHO, INPUT);
 pinMode(TRIG, OUTPUT);
 digitalWrite(TRIG, LOW);
}

long usonic(long utimeout){ //utimeout is maximum time to wait for return in us
 long b;
 if(digitalRead(ECHO)==HIGH){return 0;} //if echo line is still low from last result,
return 0;
 digitalWrite(TRIG, HIGH); //send trigger pulse
 delay(1);
 digitalWrite(TRIG, LOW);
 long utimer=micros();
 while((digitalRead(ECHO)==LOW)&&((micros()-utimer)<1000)){} //wait for pin state to changereturn starts after 460us typically or timeout (eg if not connected)
 utimer=micros();
 while((digitalRead(ECHO)==HIGH)&&((micros()-utimer)<utimeout)){} //wait for pin state to change
 b=micros()-utimer;
 if(b==0){b=utimeout;}
 return b;
  
}


if (  (distance > 0) && (distance <= 20)  ) // distance in cm
{
 
  digitalWrite(led2, HIGH); 
  digitalWrite(led4, HIGH);
  digitalWrite(led6, HIGH);
  digitalWrite(led8, HIGH);
  digitalWrite(led10, HIGH);

// note to self add else next to } 
// then repeat if statment

bodacious_migelo_albar1.ino (2.55 KB)

2

Please post your code and your actual error message

3

Code is outside a function.
You have no final } (probably)

4

sorry i have tried updating with } at the end but still gives same error.

if I try a extra one adds another unexpected token

5

Try the auto-format tool in the IDE