from machine import Pin,ADC,PWM,I2C 
from i2c_lcd import I2cLcd 
from time import sleep 
DEFAULT_I2C_ADDR = 0x3F              # LCD 1602 I2C address 
Raindrop_AO = ADC(0)                       # ADC0 multiplexing pin is GP26 
Buzzer = 12 
buzzer = PWM(Pin(Buzzer)) 
def setup(): 
global lcd
 i2c = I2C(0,sda=Pin(0),scl=Pin(1),freq=400000)
 lcd = I2cLcd(i2c, DEFAULT_I2C_ADDR, 2, 16) 
def loop(): 
while True:
 text = 'Warning!\nFlood warning!‘               # show alert information
 adc_Raindrop =Raindrop_AO.read_u16()
 if adc_Raindrop < 30000: 
lcd.putstr(text)
 buzzer.duty_u16(1000) 
buzzer.freq(294)
 sleep(0.5)
 lcd.clear() 
buzzer.freq(495) 
sleep(0.5)
 else:
 buzzer.duty_u16(0)
 if __name__ == '__main__': 
setup() 
loop()