I need a floating GPIO pin

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15

Yes, but there's two problems.

  1. I am using the Wemos D1 Mini and controlling the props over WiFi using MQTT. From my research, WiFi and the DFPlayer library don't like each other. (Interrupt conflicts).
  2. I haven't seen any example sketches using AT commands on the DFPlayer.
  3. I don't have any more time. The prop already works using the DFPlayer as a stand-alone MP3 player (I only have two SFX tracks), so just putting a GPIO pin across the manual buttons is working just fine. I pull ADKEY1 low for two seconds, and that plays track 1 on a loop. I pull ADKEY1 low through a 3K resistor and track 2 plays. That's all I need for this project.