Tell us about yourself!
Funny story... I tried to burn this to a Wemos board ESP-WROOM-02 without thinking enough. On that board, pins 7 & 8 aren't brought out but actually used to communicate with the module's flash. Setting buzzer(8) to an output led to a shoving match that the flash lost. I replaced the flash and the Wemos talks again.. Lesson learned: sometimes software problems aren't fixed by powering down. (that and I should think more)