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I need help with creating device that will be able to play sound (can be recorded or from mp3/wav...) at certain time, for example at 8:00PM, 8:15PM; 8:30PM ...until 5:00AM. Device must be powered from battery and must be working for more than 2-3 months. Sound is about max 10 seconds and it should not be loud but also not quiet. I found that for directly recording can be useful ISD1820 but then I need to set relay and clock. Then I found VS1003, and I think that this chip can be able to do that without setting relay and clock. If anyone can help me or know something better I would really appreciate that.

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closed as too broad by Leon Heller, Matt Young, Scott Seidman, placeholder, Chetan Bhargava Oct 31 '14 at 21:46

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    \$\begingroup\$ This type of vague question is closed. \$\endgroup\$ – Leon Heller Oct 30 '14 at 14:37
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    \$\begingroup\$ Is the same sound to be played each time? In other words, is 10 seconds of sound storage enough? What kind of quality? Voice? HiFi? Something else? \$\endgroup\$ – Olin Lathrop Oct 30 '14 at 14:49
  • \$\begingroup\$ low bitrate mp3 or wav, ISD1820 is capable of 10 second record by default \$\endgroup\$ – Peter Valachovic Oct 30 '14 at 15:26
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Instead of using a VS1003 and a micrcontroller, you could do that with just a VS1005G using the internal flash. The VS1005G has internal real time clock, and the player software and the short MP3 file(s) could all fit in the internal 1 megabyte flash. You can also add SD card or external (nand) flash to play longer files. When you are waiting for the RTC alarm, the VS1005 chip just uses a few microamperes.

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The VS1003 or similar module + a RTC Module + a microcontroller like a MSP430 Launchpad or Arduino plus a transistor or two is all you need.

The microcontroller and RTC can work with low voltages, and will be asleep most of the time. Heck, a microcontroller acting as a RTC would work as well.

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As a quick and simple solution, I would personally go for a Raspberry PI with a Real Time Clock module for accurate time keeping: if you want the drift to be maximum 1min at the end of 3 months, that's 7 parts per million which is quite low for standard crystal oscillators. You can also get rid of the RTC module and use a NTP (network time protocol) time keeping instead if your PI is going to be connected to a network at all times.

However, despite the fact that it enables you to use NTP to essentially get your system running forever once plugged in mains, if battery operation is a hard requirement (quite power hungry, it definitely won't run off a reasonable battery for 3 months) you can stick with a RTC with any simple-to-use microcontroller + SD card and MP3 decoder modules (e.g. Arduino + shields).

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    \$\begingroup\$ An RPi isn't really a battery powered solution. \$\endgroup\$ – Passerby Oct 30 '14 at 14:44
  • \$\begingroup\$ If the battery is not recharged for 3 months, yes since the battery would need to be quite big. \$\endgroup\$ – Mister Mystère Oct 30 '14 at 15:17
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    \$\begingroup\$ Updated my post to account for that, thanks for noting it. \$\endgroup\$ – Mister Mystère Oct 30 '14 at 15:23

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