# ds18b20.py

import machine
import onewire
import ds18x20
import time

class DS18B20:
    def __init__(self, pin_number):
        self.data_pin = machine.Pin(pin_number)
        self.ds_sensor = ds18x20.DS18X20(onewire.OneWire(self.data_pin))
        self.roms = self.ds_sensor.scan()
        if not self.roms:
            raise Exception('No DS18B20 device found')

    
    def read_temp(self, samples=1):
        if samples < 1:
            raise ValueError('Samples must be at least 1')
        
        total_temp = 0
        for _ in range(samples):
            self.ds_sensor.convert_temp()
            time.sleep_ms(750)  # Maximum conversion time for 12-bit resolution
            total_temp += self.ds_sensor.read_temp(self.roms[0])
            time.sleep_ms(100)  # Small delay between samples for sensor stability
        
        average_temp = total_temp / samples
        return average_temp

# Example usage:
# from ds18b20 import DS18B20
# sensor = DS18B20(pin_number=26)
# temperature = sensor.read_temp()
# print('Temperature:', temperature)