Skip to main content
Join the official 2019 Python Developers SurveyStart the survey!

Python implementation of 1-Wire protocol

Project description

Python implementation of 1-Wire protocol.

Originally written to replace digitemp utility in my pet project and get direct access to 1-wire devices. It was created for reading DS1820 temperature sensor connected to RS232 serial port through DS9097 adapter.

Supported Hardware


  • DS9097 - COM port adapter which performs RS-232C level conversion.
  • Custom 1-wire serial port interface (see below).



Find ROM codes for all connected devices:

from digitemp.master import UART_Adapter
from digitemp.device import AddressableDevice

# ['108739A80208006F', '10A75CA80208001A']

Get temperature:

from digitemp.master import UART_Adapter
from digitemp.device import DS1820

bus = UART_Adapter('/dev/ttyS0')  # DS9097 connected to COM1

# only one 1-wire device on the bus:
sensor = DS1820(bus)

# specify device's ROM code if more than one 1-wire device on the bus:
sensor = DS1820(bus, rom='10D67E5B02080037')

# display sensor's information

# get temperature
# 25.48

Set resolution for DS18B20 and DS1822):

from digitemp.device import DS18B20
sensor = DS18B20(bus)


digitemp.device module provides following classes:

  • DS18S20 - for DS1820, DS18S20 and DS1920 High-Precision Temperature Sensors (family code: 0x10);
  • DS18B20 - for DS18B20 Programmable Resolution Temperature Sensors (family code: 0x28);
  • DS1822 - for DS1822 Econo Temperature Sensor (family code: 0x22)
  • DS1820, DS1920 - are aliases for DS18S20


IMPORTANT DISCLAIMER: All circuits presented here are collected from different sources on the Internet and thus are provided on an entirely “as-is and no guarantees” basis. We do not provide a warranty of any kind and cannot be held responsible in any manner.

1-wire serial port interface

See Serial Port Temperature Sensors - Hardware Interface for details.

1-wire USB/UART adapter

These are tested:

  • [ds18b20-uart.svg](docs/ds18b20-uart.svg)
  • [ds18b20-uart-par.svg](docs/ds18b20-uart-par.svg)
  • [ds18b20-uart-dioda.svg](docs/ds18b20-uart-dioda.svg)
  • [ds18b20-uart-diodapar.svg](docs/ds18b20-uart-diodapar.svg)

Not all schematics work in all cases, depending on adapter and cable length.

These are not tested yet:

  • [ds18b20-uart-mosfet.svg](docs/ds18b20-uart-mosfet.svg)
  • [ds18b20-uart-npn.svg](docs/ds18b20-uart-npn.svg)


Python license. In short, you can use this product in commercial and non-commercial applications, modify it, redistribute it. A notification to the author when you use and/or modify it is welcome.

See the LICENSE file for the actual text of the license.

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Files for pydigitemp, version 1.3
Filename, size File type Python version Upload date Hashes
Filename, size pydigitemp-1.3.tar.gz (10.2 kB) File type Source Python version None Upload date Hashes View hashes

Supported by

Elastic Elastic Search Pingdom Pingdom Monitoring Google Google BigQuery Sentry Sentry Error logging AWS AWS Cloud computing DataDog DataDog Monitoring Fastly Fastly CDN SignalFx SignalFx Supporter DigiCert DigiCert EV certificate StatusPage StatusPage Status page