Using DFPlayer Pro Without Arduino Code

I am building a simple Halloween project using the Arduino Uno R3 controller and I want to play a sound effect from a DFPlayer Pro sound module without any coding. My reading so far suggests that this is possible, but I don't know how to do it.

There will be one sound file on the sound module. I think I should be able to use one of the Arduino output pins to trigger the sound effect to play one time. My thinking right now is that I should be able to trigger the sound card (at its Key input) with a (HIGH) command from one of the Uno output pins. I would turn off the trigger pin (LOW) after the sound effect has played.

I would like to avoid any coding and wiring of the RX/TX connections, as mentioned before. Both the Arduino Uno R3 and DF Player Pro module are original name brand items, no knock-offs.