Soundboard not found

[jimjones212]

I realize this topic has been posted before, but none of the previous solutions has worked for me.
Brand new Adafruit Audio FX Sound Board with demo tracks loaded (T00.WAV through T08.WAV), trying to establish a serial connection with an Arduino Mega 2560. Wiring is shown in the photo (apologies for not having multiple colors of wire). Digital pins 14 and 15 on the Arduino are serving as TX and RX channels (I've changed the pin settings in the code accordingly), and I've checked all the physical connections (all are solid). When I load the example script, menucommands.ino, and open a serial window, I get "Adafruit Sound Board! Not found".

I've tried swapping in another Arduino, as well as another sound board, and I've tried multiple digital pins for TX and RX channels. Still cannot get a connection. The board works fine in triggering mode.

[dastels]

Does the board work using the trigger pins?

Dave

[jimjones212]

Yes it does.

[dastels]

UG is grounded?

Is the code using TX3 and RX3?

Dave

[jimjones212]

UG is grounded, yes. The code assigning the signal channels is:

#define SFX_TX 14
#define SFX_RX 15

[dastels]

Hmm. Have you tried using D5 & D6 as in the example? Or try hardware serial (Tx0 & Rx0).

Dave

[jimjones212]

Yes, I tried both those configurations

[dastels]

OK. hmm. What is D4 of the Mega connected to?

Dave

[jimjones212]

It is connected to the Rst pin.
And to clarify, the TX pin on the soundboard goes to the RX pin on the Arduino and vice versa -- this is correct, right?
Is it confirmed that the soundboard works with this model of arduino (Mega 2560)?

[dastels]

Yes, Tx/Rx cross. It's a simple serial so the MCU board doesn't matter as long as the voltages and baud rate match up.

It's hard to tell in photos sometimes depending the angle, but that doesn't look like it's in the RST pin row.

Dave

[jimjones212]

That could be true in the photo but I've just confirmed that it is currently connected to the Rst pin and that all the connections are secure, using a multimeter:
UG -> GND
Gnd-> GND
Vin -> 5V
Rst -> 4
TX -> 0
RX -> 1
Not sure if this could be related but the script isn't uploading to the board when the TX pin on the soundboard is connected, it just times out.
I've also tried another computer, just in case. Same behavior.

[dastels]

Hmm.. I wonder if Tx/Rx is linked to USB like it is on an Arduino UNO.

Dave

[jimjones212]

So is this sound board incompatible with the Arduino Mega 2560?

[dastels]

Have you tried using the other UARTs on the mega? It has 3 others that aren't associated with USB (pins 14-19).

Dave

[jimjones212]

Yes, I've been using this board for a long time with no trouble: https://www.vizictechnologies.com/produ ... -processor

using channels 0 and 1 as TX and RX. Those aren't working with this new soundboard.