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Onewire Driver
This tutorial explains how to connect and read data from a DS18x20 temperature sensor.
The onewire library is also available at the pycom-libraries GitHub Repository.
Basic usage
import time
from machine import Pin
from onewire import DS18X20
from onewire import OneWire
# DS18B20 data line connected to pin P10
ow = OneWire(Pin( 'P10' ))
temp = DS18X20(ow)
while True :
print(temp.read_temp_async())
time.sleep( 1 )
temp.start_conversion()
time.sleep( 1 )
Library
#!/usr/bin/env python3
"""
OneWire library for MicroPython
"""
import time
import machine
class OneWire :
CMD_SEARCHROM = const( 0xf0 )
CMD_READROM = const( 0x33 )
CMD_MATCHROM = const( 0x55 )
CMD_SKIPROM = const( 0xcc )
def __init__ (self, pin) :
self.pin = pin
self.pin.init(pin.OPEN_DRAIN, pin.PULL_UP)
def reset (self) :
"""
4.2.9 Onewire Driver
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