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This is a simple micro SD audio player built with only an 8-pin microcontroller attiny85. Only simple firmware now The SD audio player supports only RIFF-WAVE format sound files known as Microsoft ...Read More…
This is a simple micro SD audio player built with only an 8-pin microcontroller attiny85.
Only simple firmware now
The SD audio player supports only RIFF-WAVE format sound files known as Microsoft wave file in LPCM, 8/16-bit, mono/stereo and up to 48kHz sampling rate. MP3 files must be converted to the .wav file. The player start to play on power-on or card insertion. Sound output is 8bit mono. If a sound file directory "wav" is exist on the root directory, the wave files in the sound directory will be played in order of directory listing. If the directory "wav" is not exist, the wave files on the root directory is played instead.
Push button switch is to jump to the next file. Reset button to play first file.
Player is without amplifier, but can drive small speaker or headphones, volume is enough for small discrete desktop player or for night listening. Amplified speaker is recommended.
Only simple firmware now:
You can upload/modify firmware over 6 pin ISP connector (on testpoints).
Integrated 3,3V regulator for micro SD card
You can solder USB connector or use mounting holes.
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