The Terrorkröte is a fun project based on an abandoned toy. This very special turtle contains one movable and five transparent plates on its armature. A switch was glued behind the movable one and each transparent plate was equipped with a LED. The parts were soldered to an ESP32 devboard. Two LEDs for the turtle's eyes and a speaker - connected to a PAM8403 amplifier - were also attached to the ESP32.
After powering up the Terrorkröte, the speaker starts playing a song, the transparent plates are flickering randomly and the red eyes are glowing. When the song stops, the flickering disappears and only the eyes are still glowing. Pressing the top plate resets our turtle.
A demonstration is available.
The song is not available in this repository, because reasons. However, creating a C-file of your MP3-file is very easy.
# Crop MP3 sample
ffmpeg -ss $START_SEC -t $DURATION_SEC -i $INPUT_FILE -ac 1 $OUTPUT_MP3
# Create C include file
xxd -i $OUTPUT_MP3 > ./this-repo/src/$OUTPUT_HAfterwards modify the include and its variale names for
AudioFileSourcePROGMEM in the main.cpp file.
The pins are also defined in the leds, eyes and button variable.
Furthermore, the ESP32's RX port should be connected to the amplifier's input.
You can flash your personal Terrorkröte with platformio.
pio run -t upload