The heart of the MP3 trigger board is the Cypress PSoC CY8C29466-24SXI microcontroller, which delivers MP3 data to a VLSI VS1063 Audio Codec IC. This version also supports an optional initialization file that can be used to set the baud rate of the serial port and re-program one of the 18 trigger inputs to alternative functions, including random and sequential track selection, transport control and even volume up/down. Any traditional trigger can be set to either allow an instant restart or disable the restart when audio is playing. In addition, a new trigger file naming convention offers more flexibility in naming your MP3 tracks and facilitates file management.
There is also a "quiet mode" function that can be activated via the serial control interface. In this mode, trigger inputs do not start tracks directly, but generate a serial message indicating which triggers have been activated. A host microcontroller can thus monitor the trigger input and then start any track or sequence of tracks via the serial control interface, making the triggers much more flexible.
- Input voltage range: 4.5 V to 12.0 V DC, or regulated 3.3 V (jumper selectable)
- Power consumption: approx. 45 mA idle, 85 mA playback
- Media: SDSC and SDHC microSD cards
- File system: FAT32 and FAT16
- Audio output: 1/8″ (3.5 mm) stereo headphone jack
- Trigger input: approx: Logic level 3.3V to 5.0V, active low inputs with internal pull-ups (connector provides individual ground so switches or jumpers can be connected directly to each trigger input).
- Serial: Full duplex, 8-bit, 38.4K Baud
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