ESP32-A2DP-VUmeter
Streaming Music from Bluetooth with VU meter for tera terminal based on ESP32-A2DP by Phil Schatzmann at https://github.com/pschatzmann/ESP32-A2DP
coniferconifer added simple VU meter for tera term https://ttssh2.osdn.jp/
not for Arduino IDE’s serial monitor
I have no idea why the serial monitor by Arduino IDE does not provide realtime VUmeter, just by printing VU bar and CR at the end.
See #define VUMETER and #ifdef VUMETER section. Max volume for BT audio output seems the best for ESP32-A2DP-VUmeter.
GPIO2 (Left) and GPIO4 (Right) can be used for VU LEDs , each pull downed by appropriate current limiting resisters. Noise is added to these VU LEDs.
Meta information is printed on tera term. (need to git clone the latest ESP32-A2DP )
Output example
Ex. 0dB 1kHz input Left ******************************* Right ******************************* -5dB 1kHz input Left ******************............. Right ******************............. -10dB 1kHz input Left **********..................... Right **********.....................
I2S DAC by PCM5102A board is connected to ESP32 devkitC by
GPIO23 -> DIN GPIO25 -> LCK GPIO26 -> BCK 5V -> VIN (inout to the on board 3.3V regulator) GND -> GND
PCM5102A on board switch settings:
H1L(FLT),H2L(DEMP),H4L(FMT) are shorted to GND
H3L(XMST un mute) is connected to High side(3.3V)
Tips:
When ESP32 devkitC is connected to PC USB port, audio output is slightly noisy. USB power from battery is ideal to remove noise, but I don’t care noise when digital volume at PC or smartphone (Bluetooth source) is max.
About VUMETER section
copyright 2022 coniferconifer
Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at
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