ultrasonic sensor, servo, and dc mototrs

Projects Programming
1

hi, i was trying to build a robot car the moves and avoids obstacles. i was able to program the Ultrasonic sensor along with the dc motors, but when i added the servo, the arduino moves the servo and when done the sensor messieurs the distance. its seems like the robot doesn't have enough time to check the distance and stop so it creches every time. how can i fix this problem to make the sensor and the servo work at the same time. attached are my code. Thanks in advance :wink:

arduino_robo.ino (2.02 KB)

2

Please post your code.
In code tags

3 
const int trigPin = 2; 
const int echoPin = 4; 

const int LEDR = 13; 
const int LEDG = 12;
long duration, distance, inches, cm;
const int MaxDistance = 15; 
const int In1 = 3;      
const int In2 = 5;      
const int In3 = 6;      
const int In4 = 11; 
#include <Servo.h>; 
Servo myServo;
int pos = 0;
void setup() 
{
 
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(LEDR,OUTPUT);
  pinMode(LEDG,OUTPUT);
   pinMode(In1, OUTPUT);
  pinMode(In2, OUTPUT);
  pinMode(In3, OUTPUT);
  pinMode(In4, OUTPUT); 
  
  myServo.attach(8);
}

 
void loop()
{
  {
  int speed1;
  int speed2;
  int speed3;
 
 
 
 
  speed1 = 150; 
  speed2 = 180; 
  speed3 = 158;
  while(1==1)
  {
  ping();
  distance = cm;
  if (distance < MaxDistance)
   {
     digitalWrite(LEDR, HIGH);
     digitalWrite(LEDG, LOW);

     
     analogWrite(In4, 0); 
    analogWrite(In3, 0); 
    analogWrite(In2, 0); 
    analogWrite(In1, 0);
    delay(100); 
    analogWrite(In4, speed3); 
    analogWrite(In3, 0); 
    analogWrite(In2, speed1); 
    analogWrite(In1, 0);
    delay(999); 
      analogWrite(In4, 0); 
    analogWrite(In3, 0); 
    analogWrite(In2, speed2); 
    analogWrite(In1, 0);
    delay(600);
   } 
   else
   {
  for (pos = 0; pos <= 180; pos += 1)
 { 
    myservo.write(pos);             
    delay(15);                       
  }
 
  for (pos = 180; pos >= 0; pos -= 1)
  { 
    myservo.write(pos);              
    delay(15);                       
  }
  
      digitalWrite(LEDG, HIGH);
     digitalWrite(LEDR, LOW);


  analogWrite(In4, 0); 
    analogWrite(In3, speed3); 
    analogWrite(In2, 0); 
    analogWrite(In1, speed1);
    
   }
  Serial.print(inches);
  Serial.print("in, ");
  Serial.print(cm);
  Serial.print("cm");
  Serial.println();
  delay(10);
   
}
  } 
}

void ping ()
{

  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  duration = pulseIn(echoPin, HIGH);
  inches = duration / 74 / 2;
  cm = duration / 29 /2;
  return;
}
4

delay(999);if you were running down a street, and you closed your eyes and ears for a second at a time, don't you think you would crash into things?

Get rid of the delays.
Figure on a maximum of about 20 sonar pings per second.