Help with sensor and DF mini player!

Using Arduino Programming Questions
1

Hello!

Firstly, I would like to clarify that I am extremely new to Arduino and I only got to learn about it a few times in class. For this project, I am trying to use an HC-SR04 Ultrasonic Distance Sensor to get different results. When someone comes within a certain distance of the sensor, the continuous servo motor starts to spin clockwise and then anti-clockwise. When they get even closer to the sensor, the motor just spins continuously.

I would like to use a DF mini player so that not only the continuous servo motor spins but music will be played as well. The problem is, I don't know how to incorporate it into my existing code. I have tried a few times before, and both the servo motor and DF mini-player could work, but the DF player only produced some static noise. I was wondering if it's possible for both the servo motor and the DF player to run at the same time? Or if there is something wrong with my code? I would really appreciate any help!

Here's the code for playing audio that I used: https://create.arduino.cc/projecthub/munir03125344286/play-audio-in-arduino-dde2e2

My code:

#include <HCSR04.h>
#include <Servo.h>
#include <DFRobotDFPlayerMini.h>
#include <SoftwareSerial.h>

// Use pins 2 and 3 to communicate with DFPlayer Mini
static const uint8_t PIN_MP3_TX = 2; // Connects to module's RX
static const uint8_t PIN_MP3_RX = 3; // Connects to module's TX
SoftwareSerial softwareSerial(PIN_MP3_RX, PIN_MP3_TX);

// Create the Player object
DFRobotDFPlayerMini player;

UltraSonicDistanceSensor distanceSensor(7, 8);

Servo myServo; // create servo object to control a servo

int pos = 0;

void setup() {
  Serial.begin(9600);
  myServo.attach(11);
}

void loop() {
  float distance = distanceSensor.measureDistanceCm();
  Serial.println("Distance: "); //print to serial monitor
  Serial.println(distance); //print distance in Cm to the serial monitor
  delay(500); //so we don't get overloaded by serial monitor outputs

  if (distance >= 11) {
    myServo.write(94);
    player.stop();
  } else if (distance >= 6 && distance <= 10) {
    for (pos = 0; pos <= 180; pos += 1) {
      // tell servo to go to position in variable 'pos'
      myServo.write(pos);
      // wait 15 ms for servo to reach the position
      delay(15); // Wait for 15 millisecond(s)
    }
    for (pos = 180; pos >= 0; pos -= 1) {
      // tell servo to go to position in variable 'pos'
      myServo.write(pos);
      // wait 15 ms for servo to reach the position
      delay(15); // Wait for 15 millisecond(s)
    }
  } else if (distance >= 0 && distance <= 5) {
    myServo.write(0);
    if (player.begin(softwareSerial)) {
      Serial.println("OK");
      // Set volume to maximum (0 to 30).
      player.volume(10);
      // Play the first MP3 file on the SD card
      player.play(1);
    } else {
      Serial.println("Connecting to DFPlayer Mini failed!");
    }
  }
}
2

Hello nat,
looks quite same to the Project " Play audio in Arduino". Have you tried to get the DF mini running with the " Play audio in Arduino" Project? So that you are sure the DF is working fine.
Best regards Markus

3

Yup, thanks for the reply btw, Markus! When using that code, it works just fine. However, it won't work when I add it to my code

4

I think there are a couple of issues:

  1. If someone remains between 0 and 5 cm from the sensor the above code will call player.begin(softwareSerial) every 0.5 seconds thus re-initializing the MP3 player. You really only need to call player.begin(softwareSerial) in setup().
  2. Similar to problem #1 you should really implement a "state change detection" method which calls player.play(1) only when someone ENTERS that 0 to 5 cm range not WHILE they are in that range.

This tutorial should help:

StateChangeDetection

6

Did you get this to work? Im having a similar issue. The dfplayer breaks my code.

7

Hello, unfortunately I haven't. My DF player was a faulty one.

8

???

9

It stopped working after a few more tries. :frowning:

10

After that, have you tried again to get the DF mini running with the "Play audio in Arduino" Project?

11

What does that even mean?

12

Refers to the fact that the rest of my code works without the player, but once the player is integrated, the rest no longer work perfectly.

13

Once a play is initiated, a triviality, there's nothing more to do - so I strongly suspect your implementation.

14

A serial print works just fine in place of the play command. Something with the dfplayer is causing.

15

All it could do, then, is be too great a load on the 5V (guessing that that's what you're using for its +V, and guessing about what else you have hung on there too).

16

Hello, I have a question. I saw that to connect a speaker to this module, it must be less than 3W. The fact is that they sold me the module together with a 5W speaker, how can I connect it? Do I need a power attenuator?

17

The 5W spkr is fine, no "attenuator" needed

1 Like
18

Thank you!

19

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.