Soil Moisture Alarm Using CircuitPython on Seeeduino XIAO

XiaoSoilMoistureAlarm.py

import time
import board
import simpleio
import digitalio
from analogio import AnalogIn

led = digitalio.DigitalInOut(board.D13)
led.direction = digitalio.Direction.OUTPUT
piezo = board.A3
sensor = AnalogIn(board.A2)

NOTE_C4 = 262
NOTE_D4 = 294
NOTE_E4 = 330
NOTE_F4 = 349
NOTE_G4 = 392
NOTE_A4 = 440
NOTE_E5 = 659
NOTE_F5 = 698

# Define a list of tones/music notes to play.
COFFIN_DANCE = [
    NOTE_D4, 1, NOTE_D4, NOTE_A4, NOTE_G4, 1, NOTE_F4, 1, NOTE_E4, 1,
    NOTE_E4, NOTE_F4, NOTE_G4, 1, NOTE_F4, NOTE_E4, NOTE_D4, 1,
    NOTE_D4, NOTE_F5, NOTE_E5, NOTE_F5, NOTE_E5, NOTE_F5, NOTE_D4, 1,
    NOTE_D4, NOTE_F5, NOTE_E5, NOTE_F5, NOTE_E5, NOTE_F5
]

NOTE_DURATIONS = [
    4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
    4, 4, 4, 4, 4, 4, 4, 4,
    4, 4, 4, 4, 4, 4, 4, 4,
    4, 4, 4, 4, 4, 4,
]

# Play start melody
simpleio.tone(piezo, NOTE_C4, duration=0.1)
simpleio.tone(piezo, NOTE_G4, duration=0.1)

prev_time = time.monotonic()
alarm = False

# Main loop will go through each tone in order up and down.
while True:
    if time.monotonic() - prev_time > 5:
        adc = sensor.value
        led_count = adc/6553

        if led_count > 6:
            alarm = True
        else:
            alarm = False

        for i in range(led_count):
            led.value = False
            time.sleep(0.05)
            led.value = True
            time.sleep(0.5)

        prev_time = time.monotonic()

    if alarm == True:
        for i in range(len(COFFIN_DANCE)):
            simpleio.tone(piezo, COFFIN_DANCE[i], duration=1/NOTE_DURATIONS[i])