Sonic Pi + Python + ESP32

sonicPiSerial.py

'''
this python code will listen for serial messages, 
and pass that trigger on to SonicPi (code below) as an OSC message, triggering a sound
'''

from pythonosc import osc_message_builder
from pythonosc import udp_client
import serial
import sys
import time

#select the correct port and baud rate 
ser = serial.Serial('COM9', 9600)

while True:
    try:
        ser_bytes = ser.readline()
        serialVal = str(ser_bytes, 'ascii').strip()
        if(serialVal == "0"):
            sender = udp_client.SimpleUDPClient('127.0.0.1', 4560)
            sender.send_message('/trigger/prophet', [70, 100, 1])
            time.sleep(2)
        
    except:
        print(sys.exc_info()[0])
        break

'''

--- this code goes in SonicPi---

live_loop :foo do
use_real_time
a, b, c = sync "/osc*/trigger/prophet"
synth :prophet, note: a, cutoff: b, sustain: c
end

------ end SonicPi Code ------

--- Arduino ---

You need code on your microcontroller that does Serial.println("0") under the conditions you want the sound to play.
As an example: https://gist.github.com/santolucito/22d68fd78d1359d4b865270ddbf4fecd
---

'''