ESP32 connected to I2S audio breakout, see https://learn.sparkfun.com/tutorials/i2s-audio-breakout-hookup-guide
versions:
- 04-cfg - configuration inputs Volume / Sound
- 05-led - timer estimation based on LED duty cycle
- 06-ser - disabled serial communication w/o terminal attached
+---------------+
|o ANT o|
|o ___________ o|
|o o|
|o o|
|o D22o|- I2S
I2S -|oD25 o|
I2S -|oD26 o|
|o D18o|- Vol
key -|oD33 o|
led -|oD27 D10o|- Snd
|o D9o|- Snd
|o o|
|o o|
|o o|
|o o|
|o o|
-4k7R--|oIO0 o|
|------|o3V3 o|
|oGND GNDo|- breakout GND
|o5V |USB| 3V3o|- breakout VDD
+-----+---+-----+
remarks:
- board: ESP32 pico kit
- note: 'partition scheme: no OTA' --> 1.3 Mbyte wav files in PROGMEM
- pull-up IO0 for power-up reset
- sound files based on samples from freesound https://freesound.org/ (with appropriate licenses)
- editing with https://www.audacityteam.org/
- conversion using sox http://sox.sourceforge.net/
usage:
- power (and optional commands) via usb
- runs silently for 60 min and plays sound (hardware selected)
- ⏸️ ☕ 🧘 have a break 🧘 ☕ ⏸️
- push buttons 'key' starts new cycle of 60 min
- LED shows elapsed time via duty cycle
commands (via USB / serial interface):
BCGH - sounds used
bdflpto - other sounds
0 - sound off
1..9 - volume
T - show timer
s - speed up timer
! - Reset
? - help
Bowl, Clock, Gong, Horn
bicycle bell, ding-dong, feedback, laser, power-up, tin, over
{note: in case of addtional power supply, be aware of hardware reset via serial interface flow control (1st step: use terminal w/o flow control, 2nd step: connect to USB)
