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Reply to "Remote Control Audio for Rolling Stock"

I ended up rethinking a bit of the logic for the MiniCommander to solve one vexing issue I had.

 

I have four outputs, so I can trigger four sound files.  One issue is that with the MP3 module, there is no easy way to stop it playing without using the serial computer interface.  Since I'm simulating push buttons, I can't stop the audio.

 

I figured a way, I put a 5th audio file that's just a short silent recording on the SD card and I can trigger that to stop the sound.  Of course, that brings up another problem, how do I get a 5th output from the MC?  I think I've solved that one with the following additions to my interface board.

 

Since the LC1 and LC2 outputs toggle on and off with discrete keys, they're normally used to turning on and then turning off the output for the sound you'd like to play as the MP3 module is edge triggered.  In order to trigger the 5th output, I turn on LC1 and LC2, this normally would just play the last one selected.  However, with the addition of a couple of gates, I generate a slightly delayed pulse to the 5th input to play the 5th song, which is the short silent one.  That results in the sound module being silenced.

 

I could have also just used three sound files and had the 4th be the silencing one, but I'd like to support as many different sounds as possible.

 

Yet to be determined is if I need a delay for the logic circuit to insure the 5th trigger really does the trick, but the logic seems right.

 

 

 

MiniCommander MP3 Module Interface

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  • MiniCommander MP3 Module Interface
Last edited by gunrunnerjohn

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