Ultrasonic not working

Other Hardware Displays
1

Hi, i want to make servo motor work when ultrasonic read reach > 40 cm

#include <NewPing.h>
#include <Servo.h>
Servo myservo;
#define TRIGGER_PIN  12  // Arduino pin tied to trigger pin on the ultrasonic sensor.
#define ECHO_PIN     13  // Arduino pin tied to echo pin on the ultrasonic sensor.
#define MAX_DISTANCE 200 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm.
#define US_VCC       11
#define servo_vcc    2
#define servo_gnd    1
int pos = 0;
int val;

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); // NewPing setup of pins and maximum distance.

void setup() {
  Serial.begin(115200); // Open serial monitor at 115200 baud to see ping results.
  pinMode(US_VCC,OUTPUT);
    myservo.attach(3);
    pinMode(servo_gnd,OUTPUT);
    pinMode(servo_vcc,OUTPUT);
}
void loop() {
        digitalWrite(US_VCC,HIGH);
        digitalWrite(servo_vcc,HIGH);
        digitalWrite(servo_gnd,LOW);
  
  delay(50);         
  // Wait 50ms between pings (about 20 pings/sec). 29ms should be the shortest delay between pings.
  Serial.print("Ping: ");
  Serial.print(sonar.ping_cm()); // Send ping, get distance in cm and print result (0 = outside set distance range)
  Serial.println("cm");
  val=sonar.ping_cm();
  if (val > 40 )
  servo_on();
}
void servo_on(){ 
  for (pos = 0; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees
    // in steps of 1 degree
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);                       // waits 15 ms for the servo to reach the position
  }
  for (pos = 180; pos >= 0; pos -= 1) { // goes from 180 degrees to 0 degrees
    myservo.write(pos);              // tell servo to go to position in variable 'pos'
    delay(15);                       // waits 15 ms for the servo to reach the position
  }
}

i noticed that when i remove servo lines the ultrasonic work fine, and when i remove ultrasonic lines the servo work fine, where is the problem ??

2

Hi,
which arduino are you using?
Are you using port 1 for the motor?
In some arduino models, (perhaps even all), this port is part of the serial and it is not recommended to use it for other activities.

3

im using arduino uno, i used port 1 for GND

#define servo_gnd    1

i changed it as below

#define servo_vcc    3
#define servo_gnd    2
    myservo.attach(4);
4

Are you power the servo from Arduino digital pins?
Please show your schematic

1 Like
5

What has this topic got to do with "Displays"?

6

Are you power the servo from Arduino digital pins?
yes, both the servo and the ultrasonic

Please show your schematic
the servo power connected to pin 3 and GND connected to pin 2
the ultrasonic power connected to pin 11

7

sorry, it is my fault
i think moderators will move it to suitable section

8

Still waiting for a schematic... words are not a schematic.

9

Why do you not power the servo from power pins - 5v and GND?
The maximum output current of arduino digital pin is 40mA, recommended - 20mA. The most of servos need far much current.
The using the digital pin as GND is non-sense at all.

10

What is the resulting output? Does the value reach 40 as you expect?

11

Check for possible conflict between the libraries over timer usage.

Never use an Arduino for servo or motor power. A 4XAA battery pack will power 2 SG-90 servos, but be sure to connect all the grounds.

12

image

wow, the circuit now working with the same code and the same scheme :upside_down_face:
and yes it reaches more than 40

13

You are risking damage to the pins connected to servo power and ground connections. They can't safely handle the current.

I see you are powering the ultrasonic the same way. No good.

By the way, a Fritzing diagram isn't a schematic either, it's a parts layout diagram. In this case it's simple enough that you can get away with it. A more complex circuit, no way.

14

i know i will face power problem in future, the project i want to work on is a GPS guided robot. the components i want to use are a GPS, GSM, Compass module, 4 DC motors for 4 wheels, and 2 servo motors.
Do you have suggestions?

im still new to arduino and never heard about this, do you have something to read about it

15

It's better to face it now, before you destroy your board.

16

You may have already damaged the Arduino board by using it to power servos.

Search engines work great for getting information on general topics, like arduino library conflicts.

17

You did not answer to question:

18

i saw someone did that on YouTube, beside i want to keep them for GPS or compass module

19

This is very bad advice, for several reasons. Please do not give it.

20

If the arduino is powered by USB or another 5v source, then this is a valid connection.

And in any case, it's better than powering the servos from digital pins.