LCD printing weird characters in loop function

Other Hardware LEDs and Multiplexing
1

Hi, I'm working on a project that plays wav files from an SD card and prints a number for the song playing. I am using the Tmrpcm library and in the loop function of my sketch the lcd replaces my normal text with odd special characters. However the text in setup is normal. I believe to have narrowed it down to the program because the "hello world" example works just fine.

Here is my sketch:

#include <pcmRF.h>
#include <TMRpcm.h>
#include <SD.h>
#define SD_ChipSelectPin 10
#include <LiquidCrystal.h>

LiquidCrystal lcd(7, 8, 5, 6, 11, 12);
byte face[8] = {
  B01110,
  B10001,
  B11011,
  B10001,
  B10101,
  B01110,
  B00100,
  };

  TMRpcm tmrpcm;
  int track = 1;
  
  const int button1 = 4;
  const int button2 = 2;
  const int button3 = 3;
  int state1 = 0;
  int state2 = 0;
  int state3 = 0;

void setup(){ 
  lcd.createChar(0, face);
  lcd.begin(16, 2);
  lcd.write(byte(0));
  lcd.print(" AudioMan Rdy!");
  lcd.setCursor(0, 1);
  lcd.print("Select Trk 1-6");
  
  SD.begin(SD_ChipSelectPin);
  tmrpcm.speakerPin = 9;
  tmrpcm.play("BNV.wav");
  
  pinMode(button1, INPUT);
  pinMode(button2, INPUT);
  pinMode(button3, INPUT);
}

void loop(){
  if (track > 6) {    //Constrain numbers.
    track = 0;}
  if (track < 0) {
    track = 0;}
    
    state3 = digitalRead(button3);    //Button control.
    state2 = digitalRead(button2);
    state1 = digitalRead(button1);
    
    if (state3 == HIGH) {
      track = track + 1;
      delay(250);}
    if (state2 == HIGH) {
      track = 0;
      delay(250);}
    if (state1 == HIGH) {
      track = track - 3;
      delay(250);}
      
    if (track == 2) {    //Audio tracks.
      tmrpcm.play("BN3t.wav");
      track = 3;}
    else if(track == 0){ 
      tmrpcm.stopPlayback();}
    else if(track == 4){ 
      tmrpcm.play("BN4f.wav");
      track = 5;} 
}

Any help would be grealty appreciated. Thanks!

2

Your libraries are most likely using the same pins. Are they loose boards connected by wires, or stacked on top of each other?

3

Your limit check on the track number needs to be AFTER you change, not BEFORE you change it.

4

I have put the track limit at the end of the sketch and still have the error. I am using an SD shield that uses pin 10 and a homemade speaker shield that uses pin 9. The LCD and buttons are connected by wires from the breadboard. As far as I know they aren't using the same pins.

5

The PCM library uses pin 9 by default, and pin 10 for complimentary output. Either use a different pin (10) fro the SD shield or change the following lines in TMRpcm.cpp

from:

*OCRnA[tt] = *OCRnB[tt] = buffer[whichBuff][buffCount];

to:

*OCRnA[tt] = buffer[whichBuff][buffCount];

And this:

*TCCRnA[tt] = _BV(WGM11) | _BV(COM1A1) | _BV(COM1B0) | _BV(COM1B1);

to this:

*TCCRnA[tt] = _BV(WGM11) | _BV(COM1A1) ;

Not 100% sure if that is what is causing your specific problem, but figure it would... also SD cards usually use pins 11 and 12 for miso/mosi, so kind of wondering if multiple pins are being used between LCD and SD.