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GitHub - anton-tchekov/avr-audio-player: Music player ...
https://github.com/anton-tchekov/avr-audio-player
avr-audio-player Music player (.wav files from SD card) See hardware.txt for more infos. Battery Life: ~ 40 hours with old AA batteries (20 mA usage, most of which by the SD card) About Music player (.wav files from SD card)
play audio from sd card using avr mcu(atmega-) | AVR Freaks
https://www.avrfreaks.net/forum/play-audio-sd-card-using-avr-mcuatmega
This is a simple SD audio player biult with only an 8-pin microcontroller. The ATtinyX5 series (25/45/85) 8-pin AVR microcontroller has two fast PWM outputs in 250kHz carrier frequency. This enables to output a wide frequency range audio signal. In the project description ChaN does not mention that only the ATtiny85 will work with the project.
Atmel AVR32839: AVR UC3 Audio Player
https://ww1.microchip.com/downloads/en/AppNotes/doc32177.pdf
Atmel AVR32839: AVR UC3 Audio Player Features • Music played over mass storage device –USB dski – SD card † Software audio decoders † FAT file system † USB host mass storage class (MSC) † Standalone - low memory footprint (c ode & RAM) and no operating system dependency † Configurable audio output – External I2S audio DAC
AVR 16bit Stereo Wave Player - Atmega32 AVR
https://atmega32-avr.com/avr-16bit-stereo-wave-player/
To ensure system stability, ATmega1284p is powered by 5V while SD card is powered by 3.3V with a cheap, linear regulator AMS1117-3V3 (not shown in schematic). To interact with SD card correctly, resistor dividers (3.3K and 1.8K) are used to guarantee AVR’s SPI signal level would never exceed 3.3V.
Interfacing SD Card with AVR Microcontroller - …
https://atmega32-avr.com/interfacing-sd-card-avr-microcontroller/
This project explains how to interface the SD card with an AVR microcontroller. In this project an ATMEGA16 microcontroller is used. The microcontroller runs on 5V power supply with a built in crystal frequency of 8 MHz. A 2GB SDSC card from Transcend is used in this particular project, but the code will work with most of the SD cards.
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