I have successfully gotten the pressure switch to activate the sound which plays beautifully through my speakers, but I cannot seem to get a handle on the LEDs. I wanted to merge the "fade" sketch into my master project. Since the main loop of the sketch gets hung up playing the sound, I embedded the fade actions with the void (play) during the while (wav.isplaying) section.
What I observe is that the LED starts ON which is not correct given my settings. Additionally, when the music plays the LED does not fade at all, it just stays on. When I watch the serial monitor, the correct values are cycling through the analogWrite variables but I see no results in the LED itself.
Any advice is appreciated. Sketch is pasted below, area in question is underlined (near bottom):
Code: Select all
#include <FatReader.h>
#include <SdReader.h>
#include <avr/pgmspace.h>
#include "WaveUtil.h"
#include "WaveHC.h"
SdReader card; // This object holds the information for the card
FatVolume vol; // This holds the information for the partition on the card
FatReader root; // This holds the information for the filesystem on the card
uint8_t dirLevel; // indent level for file/dir names (for prettyprinting)
dir_t dirBuf; // buffer for directory reads
WaveHC wave; // This is the only wave (audio) object, since we will only play one at a time
//code snippet for the switch
const int buttonPin = 6; // the number of the pushbutton pin
// variables will change:
int buttonState = 0; // variable for reading the pushbutton status
//end switch code
//LED FADE START
int led = 11; // the pin that the LED is attached to
int brightness = 255; // how bright the LED is
int fadeAmount = 5; // how many points to fade the LED by
//LED FADE END
// Function definitions (we define them here, but the code is below)
void lsR(FatReader &d);
void play(FatReader &dir);
void setup() {
Serial.begin(9600); // set up Serial library at 9600 bps for debugging
putstring_nl("\nWave test!"); // say we woke up!
putstring("Free RAM: "); // This can help with debugging, running out of RAM is bad
Serial.println(freeRam());
// Set the output pins for the DAC control. This pins are defined in the library
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
// SWITCH - initialize the LED pin as an output:
pinMode(led, OUTPUT);
// initialize the pushbutton pin as an input:
pinMode(buttonPin, INPUT);
//END SWITCH
// if (!card.init(true)) { //play with 4 MHz spi if 8MHz isn't working for you
if (!card.init()) { //play with 8 MHz spi (default faster!)
putstring_nl("Card init. failed!"); // Something went wrong, lets print out why
sdErrorCheck();
while(1); // then 'halt' - do nothing!
}
// enable optimize read - some cards may timeout. Disable if you're having problems
card.partialBlockRead(true);
// Now we will look for a FAT partition!
uint8_t part;
for (part = 0; part < 5; part++) { // we have up to 5 slots to look in
if (vol.init(card, part))
break; // we found one, lets bail
}
if (part == 5) { // if we ended up not finding one :(
putstring_nl("No valid FAT partition!");
sdErrorCheck(); // Something went wrong, lets print out why
while(1); // then 'halt' - do nothing!
}
// Lets tell the user about what we found
putstring("Using partition ");
Serial.print(part, DEC);
putstring(", type is FAT");
Serial.println(vol.fatType(),DEC); // FAT16 or FAT32?
// Try to open the root directory
if (!root.openRoot(vol)) {
putstring_nl("Can't open root dir!"); // Something went wrong,
while(1); // then 'halt' - do nothing!
}
// Whew! We got past the tough parts.
putstring_nl("Files found:");
dirLevel = 0;
// Print out all of the files in all the directories.
lsR(root);
}
//////////////////////////////////// LOOP
void loop() {
//SWITCH
// read the state of the pushbutton value:
buttonState = digitalRead(buttonPin);
analogWrite(led,0);
// check if the pushbutton is pressed.
// if it is, the buttonState is LOW:
if (buttonState == LOW) {
// turn LED on:
root.rewind();
play(root);
}
//END SWITCH
}
/////////////////////////////////// HELPERS
// this handy function will return the number of bytes currently free in RAM, great for debugging!
int freeRam(void)
{
extern int __bss_end;
extern int *__brkval;
int free_memory;
if((int)__brkval == 0) {
free_memory = ((int)&free_memory) - ((int)&__bss_end);
}
else {
free_memory = ((int)&free_memory) - ((int)__brkval);
}
return free_memory;
}
/*
* print error message and halt if SD I/O error, great for debugging!
*/
void sdErrorCheck(void)
{
if (!card.errorCode()) return;
putstring("\n\rSD I/O error: ");
Serial.print(card.errorCode(), HEX);
putstring(", ");
Serial.println(card.errorData(), HEX);
while(1);
}
/*
* print dir_t name field. The output is 8.3 format, so like SOUND.WAV or FILENAME.DAT
*/
void printName(dir_t &dir)
{
for (uint8_t i = 0; i < 11; i++) { // 8.3 format has 8+3 = 11 letters in it
if (dir.name[i] == ' ')
continue; // dont print any spaces in the name
if (i == 8)
Serial.print('.'); // after the 8th letter, place a dot
Serial.print(dir.name[i]); // print the n'th digit
}
if (DIR_IS_SUBDIR(dir))
Serial.print('/'); // directories get a / at the end
}
/*
* list recursively - possible stack overflow if subdirectories too nested
*/
void lsR(FatReader &d)
{
int8_t r; // indicates the level of recursion
while ((r = d.readDir(dirBuf)) > 0) { // read the next file in the directory
// skip subdirs . and ..
if (dirBuf.name[0] == '.')
continue;
for (uint8_t i = 0; i < dirLevel; i++)
Serial.print(' '); // this is for prettyprinting, put spaces in front
printName(dirBuf); // print the name of the file we just found
Serial.println(); // and a new line
if (DIR_IS_SUBDIR(dirBuf)) { // we will recurse on any direcory
FatReader s; // make a new directory object to hold information
dirLevel += 2; // indent 2 spaces for future prints
if (s.open(vol, dirBuf))
lsR(s); // list all the files in this directory now!
dirLevel -=2; // remove the extra indentation
}
}
sdErrorCheck(); // are we doign OK?
}
/*
* play recursively - possible stack overflow if subdirectories too nested
*/
void play(FatReader &dir)
{
FatReader file;
while (dir.readDir(dirBuf) > 0) { // Read every file in the directory one at a time
// skip . and .. directories
if (dirBuf.name[0] == '.')
continue;
Serial.println(); // clear out a new line
for (uint8_t i = 0; i < dirLevel; i++)
Serial.print(' '); // this is for prettyprinting, put spaces in front
if (!file.open(vol, dirBuf)) { // open the file in the directory
Serial.println("file.open failed"); // something went wrong :(
while(1); // halt
}
if (file.isDir()) { // check if we opened a new directory
putstring("Subdir: ");
printName(dirBuf);
dirLevel += 2; // add more spaces
// play files in subdirectory
play(file); // recursive!
dirLevel -= 2;
}
else {
// Aha! we found a file that isnt a directory
putstring("Playing "); printName(dirBuf); // print it out
if (!wave.create(file)) { // Figure out, is it a WAV proper?
putstring(" Not a valid WAV"); // ok skip it
} else {
Serial.println(); // Hooray it IS a WAV proper!
wave.play(); // make some noise!
while (wave.isplaying) { // adjusted for LED Dim
[u] //LED FADE START
// set the brightness of LED pin:
putstring("analogWrite( ");Serial.println(led);putstring(", ");Serial.println(brightness);
analogWrite(led, brightness);
// change the brightness for next time through the loop:
brightness = brightness + fadeAmount;
// reverse the direction of the fading at the ends of the fade:
if (brightness == 0 || brightness == 255) {
fadeAmount = -fadeAmount ;
}
// wait for 30 milliseconds to see the dimming effect
delay(150);
//LED FADE END
[/u]
}
sdErrorCheck(); // everything OK?
// if (wave.errors)Serial.println(wave.errors); // wave decoding errors
}
}
}
}