NoiseBox
ESP32 with Ultrasonic sensor plugged in, If distance below 250cm then send audio file via Bluetooth to Speaker Details of Ultrasonic sensor usage here: https://RandomNerdTutorials.com/esp32-hc-sr04-ultrasonic-arduino/ Bluetooth library from https://github.com/pschatzmann/ESP32-A2DP
The sound array file (toot.h) can be prepared e.g. in the following way:
Open any sound file in Audacity.
Select Tracks -> Resample and select 44100
Export -> Export Audio -> Header Raw ; Signed 8 bit PCM
Convert to c file e.g. with "xxd -i file_example_WAV_1MG.raw file_example_WAV_1MG.c"
add the const qualifier to the generated array definition. E.g const unsigned char file_example_WAV_1MG_raw[] = {
Note: used 8-bit rather than 16bit as limited memory on my board. Also found using 16bit produced a very high noise floor.
