ARDUINO SD DOORBELL
A doorbell project for Arduino Uno with ATMEGA328P device.
The firmware works for SD or SDHC cards only. Do not use SDXC cards with this project because some of them work on 1.8V drive. The code detects whether the card is SD or SDHC and selects the proper addressing system for the card. The quality of the audio is reasonable.
The software has the functions needed to read SD/SDHC card formatted in FAT32. The software can play only PCM 22.050KHz, 8 bits, mono. The bytes from the file are streamed to PWM
generator and with an external low pass filter you get the audio. The PWM
gives 64KHz wave with duty cycle modulated to the audio amplitude. A low
pass filter removes the 64KHz component.
SD card interfaces the microcontroller in SPI mode. Reading data is in multi-blocks.
The Error LED indicates error of communication with the SD card.
The software searches for files entries in the root directory only, it streams any file type without reading its name or type.
TO SET UP THE CARD:
Create sound file type .wav
Name the file with short name, 8 low case characters max.
Save the file as 22.050KHz, 8 bits, mono. Format the card with FAT32.
Add the files to the root directory
of the card (don't use a subdirectory).
Troubleshooting:
If the Error LED is on immediately on power up it means that the card
failed to initialize. This code works for SD card rev 2 or SDHC card, it
doesn't work for SDXC (1.8V) or MMC or SD rev 1 cards.
More about FAT32 in this document: https://staff.washington.edu/dittrich/misc/fatgen103.pdf
More about WAV in here: https://ccrma.stanford.edu/courses/422/projects/WaveFormat/
Good free specifications for SD can be found in SanDisk PDF: http://alumni.cs.ucr.edu/~amitra/sdcard/ProdManualSDCardv1.9.pdf
Arduino code. You are free to use the circuit diagram and software with no
limitations.
ARDUINO EEPROM DOORBELL
A doorbell project for Arduino Uno with ATMEGA328P device.
The EEPROM 24C512 is 512Kbits and it can store up to 3 seconds wave file
of 22.050KHz, 8 bits, mono. The Arduino reads the ROM bytes in a
sequential read mode and stream each byte to the PWM generator at a rate of about 22
KHz. The I2C bus works at 200 KHz for the purpose of managing to process
22 Kbits per second. Changing the bus frequency changes the speed of the
sound. The I2C lib doesn't have a function for sequential read, so I added a routine. Included in the software is HEX file for the EEPROM. It has a
sound of a rooster crowing, I use this one in my house.
To convert
sound file to hex do this: Convert sound file to .wav PCM
22.050KHz, 8 bits, mono Change the file name extension from wav to bin. Load the
bin file
to the EEPROM Programmer, I used PICKIT2. To remove the file header
you can change the first 44 bytes to zeros or remove them using any BIN
FILE EDIT software. Export the file from the
programmer as HEX.
PIC16F876A EEPROM DOORBELL
The EEPROM 24C512 is 512Kbits and it can store up to 3 seconds wave file
of 22.050KHz, 8 bits, mono. The PIC reads the ROM address 0 first
and then reads bytes in a
sequential read mode and stream each byte to the PWM generator at a rate of about 22
KHz. The I2C bus works at about 300 KHz for the purpose of managing to process
22 Kbits per second. Changing the bus frequency changes the speed of the
sound. I use resistors DAC (Digital to Analogue Converter) because the
PIC's PWM is too slow. It is easy to get 6 seconds sound at 11.025 KHz
wave file by changing the crystal osc to 4 MHz. Included in the software is HEX file for the EEPROM. It has a
sound of a rooster crowing, I use this one in my house.
To convert
sound file to hex do this: Convert sound file to .wav PCM
22.050KHz, 8 bits, mono Change the file name extension from wav to bin. Load the
bin file
to the EEPROM Programmer, I used PICKIT2. To remove the file header
you can change the first 44 bytes to zeros or remove them using any BIN
FILE EDIT software. Export the file from the programmer as HEX.
Circuit Description
See also Technical Tips
The 3.3V is sourced by the Arduino board. 1K and 2K resistors at the inputs to the SD are to reduce the 5V signals to 3.3V signals. MISO card output is only 3.3V but it is ok for the 5V input of the AMD.
The card's pins number are for standard size SD, for Micro SD the pins are different.

Circuit Description
See also Technical Tips
Transistors can be equivalents to the ones marked. pin 7 of 24C512 can be connected to 5V to
inhibit writing.

Circuit Description
See also Technical Tips
BC337 and BC307 switch on the audio amp for the duration of the
ring. You can omit this switch and connect the amp directly to the supply if the
hiss noise from the amp isn't a problem. pin 7 of 24C512 can be connected to 5V to
inhibit writing. 1R resistors can be 10K or 7.5K and 2R 20K or 15K. Values
aren't critical, 20% error is acceptable.
|