Hello,
I'm trying to use an ultra sonic hc-sr04 sensor to trigger a dfplayer in order to play a song.
My problem is that once it has been triggered and the song has finished I can not get the sensor to trigger the dfplayer again.
Does anyone know what I might need to change or include in the code?
This is the code I have been using:
#include "Arduino.h"
#include "SoftwareSerial.h"
#include "DFRobotDFPlayerMini.h"
const byte SENSOR_COUNT = 1;
byte triggerPins[SENSOR_COUNT] = {9};
byte echoPins[SENSOR_COUNT] = {13};
SoftwareSerial mySoftwareSerial(10, 11); // RX, TX
DFRobotDFPlayerMini myDFPlayer;
void printDetail(uint8_t type, int value);
void setup()
{
mySoftwareSerial.begin(9600);
Serial.begin(9600);
for( byte i=0; i<SENSOR_COUNT; i++ )
{
pinMode(triggerPins[i], OUTPUT);
pinMode(echoPins[i], INPUT);
}
Serial.println();
Serial.println(F("DFRobot DFPlayer Mini Demo"));
Serial.println(F("Initializing DFPlayer ... (May take 3~5 seconds)"));
if (!myDFPlayer.begin(mySoftwareSerial)) { //Use softwareSerial to communicate with mp3.
Serial.println(F("Unable to begin:"));
Serial.println(F("1.Please recheck the connection!"));
Serial.println(F("2.Please insert the SD card!"));
while(true);
}
Serial.println(F("DFPlayer Mini online."));
myDFPlayer.volume(20); //Set volume value. From 0 to 30
}
int currentSound = -1;
void loop()
{
for( byte i=0; i<SENSOR_COUNT; i++ ) // loop through all distance sensors
{
if( detectPresence(i) ) // check if there is an object near it
{
if(currentSound!=i) // check that it's a different sensor than the one that was last triggered
{
Serial.print("play song number ");
Serial.println(i);
myDFPlayer.play(1); // play song nr `i+1`
}
currentSound = i;
}
}
if (myDFPlayer.available()) {
printDetail(myDFPlayer.readType(), myDFPlayer.read()); //Print the detail message from DFPlayer to handle different errors and states.
}
}
// detectPresence will return TRUE if there is an object close to it.
bool detectPresence(byte sensorNr)
{
if( sensorNr>=SENSOR_COUNT )
return false;
long duration, distance;
//digitalWrite(triggerPins[sensorNr], LOW); // Added this line
//delayMicroseconds(10); // Added this line
digitalWrite(triggerPins[sensorNr], HIGH);
delayMicroseconds(15); // Added this line
digitalWrite(triggerPins[sensorNr], LOW);
duration = pulseIn(echoPins[sensorNr], HIGH);
distance = duration/58;
return (distance > 1 && distance <= 8); { //distance in centimeter, fx between 1 - 8 cm
}
}
void printDetail(uint8_t type, int value){
switch (type) {
case TimeOut:
Serial.println(F("Time Out!"));
break;
case WrongStack:
Serial.println(F("Stack Wrong!"));
break;
case DFPlayerCardInserted:
Serial.println(F("Card Inserted!"));
break;
case DFPlayerCardRemoved:
Serial.println(F("Card Removed!"));
break;
case DFPlayerCardOnline:
Serial.println(F("Card Online!"));
break;
case DFPlayerPlayFinished:
Serial.print(F("Number:"));
Serial.print(value);
Serial.println(F(" Play Finished!"));
break;
case DFPlayerError:
Serial.print(F("DFPlayerError:"));
switch (value) {
case Busy:
Serial.println(F("Card not found"));
break;
case Sleeping:
Serial.println(F("Sleeping"));
break;
case SerialWrongStack:
Serial.println(F("Get Wrong Stack"));
break;
case CheckSumNotMatch:
Serial.println(F("Check Sum Not Match"));
break;
case FileIndexOut:
Serial.println(F("File Index Out of Bound"));
break;
case FileMismatch:
Serial.println(F("Cannot Find File"));
break;
case Advertise:
Serial.println(F("In Advertise"));
break;
default:
break;
}
break;
default:
break;
}
}