Index Someone Like You.Mp3 How To Build An

This board is placed between a stereo audio source and a stereo audio consumer such as an FM transmitter or amplifier.

When the board wirelessly receives an encoded message it breaks into the audio stream from the current source and plays the MP3 sound clip related to the message received.

After the clip finishes playing the board switches back to the original source (in my case an iPod.) I designed this board as a companion board for a board I designed to detect when my woodshop dust collector is full.

Even though the dust collector full board would turn on a flashing strobe, I would still occasionally not notice it.

The shop is quite loud when the dust collector and other stationary tools are running so Im almost always wearing my hearing protector with a built-in FM receiver.

Using this board I now hear Dust collector full though my hearing protector.

The board exposes 2 of the 4 possible inputs as standard 3.5mm stereo jacks.

A 3rd source is an onboard MP3 player chip, and the 4th source is unused.

The output is through a standard 3.5mm stereo jack.

The MP3 player has 3 possible sources: SD card, USB Stick, and NOR Flash.

The MP3 player is the same YX5200-24SS chip found on many DF Player modules (although most of the cheaper versions of this module use counterfeit chips that lack all of the functionality of the original chip.) The major difference of this implementation using the YX5200-24SS chip is that it is stereo and it supports NOR Flash EEPROM.

You can preload the NOR Flash with MP3 clips or use either of the other sources.

At startup the MP3 player will default to USB if its available, followed by the SD card, and then NOR Flash.

You can modify the software to change the source precedence, or have the MP3 source based on the message received.

As programmed the external input is passed through to the output.

As with the MP3 source, this behavior can be changed in software.

Also volume, balance, treble, and several other audio switch features can be controlled through the software.

The board also has the option of adding a headphone amplifier module.

I use the amplifier in my configuration because the output feeds an FM transmitter and the transmitter performs better with the amplifier than when its fed line level audio.

All of the unused pins have been brought to the edge of the board.

The board has an I2C connector with an interrupt line for future development (display, keypad, etc.

The schematic is enclosed in the next step.

As with the other boards Ive designed, this boards gerber files are shared on PCBWay.

A 3D printed enclosure is available on Thingiverse::3102114 Add Tip Ask Question Comment Download Step 1: Instructions for Assembling the Board Instructions for assembling the board (or almost any small board) follows.

In the following steps Im assembling a board without the optional headphone amplifier.

Index Someone Like You.Mp3 How To Build An

If you already know how to build an SMD board, skip to step 13.

Attachments Audio Alert v2.3 Parts.txt Download Audio Alert v2.3.pdf Download Add Tip Ask Question Comment Download Step 2: Gather Parts I start by taping a piece of paper to the worktable with labels for all of the very small parts (resistors, capacitors, LEDs).

Around the edge I add the other, easy to identify parts.

Note that I use this same piece of paper for other boards Ive designed, so only a few of the locations in the photo have parts next toon the labels) Add Tip Ask Question Comment Download Step 3: Mount the Board Using a small piece of wood as a mounting block, I wedge the PCB board between two pieces of scrap prototype board.