OK...we are having some problems. Everything was going so well. We actually had 2 board stacks working and then disaster struck and we don't know what to do. So...here is the history.
1. We ordered some V2 boards just before you came out with the V3 version.
2. So we thought, hey, let's get try the latest and greatest so we got a couple of the V3
3. We got the V3s working and all seemed to be good. Except for 1 of the V3 stacks stopped playing audio. We had been handling that one V3 so much that we thought it might be damaged. So we opted to get the other V2s running. No big deal right?
4. On to the V2s. We assembled them and turned them on. Everything looked good except that we did not have any audio coming out.
5. We tried a different speaker and tried the beep command. No luck.
6. We are getting 5V to the Teensy so I am assuming that the 5V regulator is working.
7. I am confident that the chip is put on correctly. If you are looking at the top of the board with the FETs on the right hand side...the audio chip is mounted such that pin 1 is in the top left hand corner.
8. Again we tried the serial commands dir and beep. I was able to see the wav files using dir but nothing from the beep. No feedback. I was not even able to use the command amp to turn on the amplifier. All I got back was "Whut? :amp". When it boots up, it says that the amp is off. We tried to see whether the enable pin was working when the blade is turned off and it seemed to. I want to say it jumped up to ~3V and the serial said it was playing the sound file.
We are out of ideas to try and hope that you can help point us in another direction...software, places to probe, ways to check... Anything? :)
Thanks in advance!!
First of all, you need to type "amp on" or "amp off", just typing "amp" won't do anything.
Second, make sure that your config file(s) include the right board config (v2_config.h or v3_config.h, or it won't work)
If you have an oscilloscope, you can hook it up instead of a speaker to see if the amp is doing anything.
If you do not have an oscilloscope, you can try a multimeter set to measure alternating current.
For the V2 boards, you should be able to measure the input to the amp from the analog out on the teensy as well.
If you're not getting audio out from A14, then the problem is definitely on the teensy or software side.
When I've had these kinds of problems, it's usually because the amp didn't quite connect right, so I have to
de-solder it, apply a tiny amount of solder paste and put it back on again.