HackFFM-Duino Chime

HackFFM-Duino Chime alpha version

by: DCEM

LeandraChristine needed a small solution for sound in a project. Since I was designing lots of PCB’s anyway I decided to also realize this one. Another requirement was fast responsiveness. The SimpleSDAudio-library from Tut provides just that. Tut helped quite a lot with the circuit design in this project.

We did a Reflow Workshop to build plenty of them.

The board is carrying:

• Atmega328
• MAX9098306 3.7W stereo Class D amplifier
• SN74LVC2G14 dual Schmitt-Trigger with its own low noise power supply
• microSD-Card Slot
• 74LVC1G53DP Analog Switch, to set the gain of the Class D amplifier (3 levels)

The controller itself is running on 3.3V (because of the SD-Card). The supply voltage is 5V.

Choose between 8bit Stereo or 16bit mono Sound.

Board size: 15 x 30mm(0.6 x 1.2 inches)

8 Pins are accessible including i²C PINS

HackFFM-Duino-Chime on GitHub

To make sure the code can be uploaded:

Set the Arduino IDE to - Board - Arduino Uno

Supply the pcb with 5V (in addition to your programmer)

Your speaker for this example should be attached to +/-1

/*
 Simple SD Audio bare minimum example, plays file EX1.MIX from root folder of SD card.
 
 This example shows how to use the SimpleSDAudio library with Chime
 http://hackerspace-ffm.de/wiki/index.php?title=HackFFM-Duino_Chime
 
 See SimpleSDAudio.h or our website for more information:
 http://www.hackerspace-ffm.de/wiki/index.php?title=SimpleSDAudio
 
 created  27 Sep 2015 by Lutz Lisseck
 */
#include <SimpleSDAudio.h>

/* Chime Special function block start */
#define CHIME_GAIN_SW  2
#define CHIME_GAIN_EN  A3
#define CHIME_SPK_EN   A1
#define CHIME_LED      5
#define CHIME_SD_DET   8
#define CHIME_SD_CS    4
/* gain 0 off, 1 quiet, 2 loud */
void setupChime(unsigned char gain) {
  pinMode(CHIME_GAIN_SW, OUTPUT);  
  pinMode(CHIME_GAIN_EN, OUTPUT);
  pinMode(CHIME_SPK_EN, OUTPUT);
  pinMode(CHIME_LED, OUTPUT); digitalWrite(CHIME_LED, LOW);
  pinMode(CHIME_SD_DET, INPUT_PULLUP);
  switch(gain) {
    case 0: // off
      digitalWrite(CHIME_SPK_EN, LOW);
      digitalWrite(CHIME_GAIN_EN, HIGH);
      digitalWrite(CHIME_GAIN_SW, LOW);
      break;
    case 1: // soft
      digitalWrite(CHIME_SPK_EN, HIGH);
      digitalWrite(CHIME_GAIN_EN, HIGH);
      digitalWrite(CHIME_GAIN_SW, LOW);
      break;
    default: // loud
      digitalWrite(CHIME_SPK_EN, HIGH);
      digitalWrite(CHIME_GAIN_EN, LOW);
      digitalWrite(CHIME_GAIN_SW, HIGH);
      break;       
  }
  SdPlay.setSDCSPin(CHIME_SD_CS);
}
/* Chime Special function block end */

void setup()
{
  // Open serial communications and wait for port to open:
  Serial.begin(9600);

  setupChime(2);
  
  // Using F("...") to avoid wasting RAM  
  Serial.print(F("\nInitializing SD card..."));  
  
  if (!SdPlay.init(SSDA_MODE_FULLRATE | SSDA_MODE_STEREO | SSDA_MODE_AUTOWORKER)) {
    Serial.println(F("initialization failed. Is FAT formated card inserted?"));
    Serial.print(F("Error code: "));
    Serial.println(SdPlay.getLastError());
    while(1);
  } else {
   Serial.println(F("Wiring is correct and a card is present.")); 
  }

  Serial.print(F("Looking for EX1.MIX... "));
  if(!SdPlay.setFile("EX1.MIX")) {
    Serial.println(F(" not found on card! Error code: "));
    Serial.println(SdPlay.getLastError());
    while(1);
  } else {
   Serial.println(F("found.")); 
  }    

  Serial.print(F("Playing... ")); 
  SdPlay.play();
  while(!SdPlay.isStopped()) {
    ;	// no worker needed anymore :-)
    delay(500);
    digitalWrite(CHIME_LED, !digitalRead(CHIME_LED));
  }
  Serial.println(F("done."));
  SdPlay.deInit();
}

void loop(void) {

}

Licensing CC v4.0 Share-Alike (http://creativecommons.org/licenses/by-sa/4.0/)

I started out with the open log design. Although there is not much left of it, it was some help.

I also used libraries from sparkfun and adafruit.