owfs Development Site

• 1: OWFS 1-Wire File System
  • 1.1: What is 1-wire?
  • 1.2: Master and slaves
  • 1.3: Divide and conqueror
  • 1.4: owserver
  • 1.5: What is "uncached"?
  • 1.6: Temperature measurements
  • 1.7: Survey
  • 1.8: Quickstart guide
  • 1.9: Vendors
• 2: Software
  • 2.1: man pages: Programs
    • 2.1.1: Programs
      • 2.1.1.1: configuration file
      • 2.1.1.2: owshell
      • 2.1.1.3: owserver
      • 2.1.1.4: owftpd
      • 2.1.1.5: owhttpd
      • 2.1.1.6: owfs
      • 2.1.1.7: owtap
      • 2.1.1.8: owmon
  • 2.2: Language modules
    • 2.2.3: Full - libow
      • 2.2.3.1: owcapi
      • 2.2.3.2: owperl
      • 2.2.3.3: owtcl
      • 2.2.3.4: owphp
    • 2.2.4: Light - OWNet
      • 2.2.4.1: OWNet.vb
      • 2.2.4.2: OWNet.py
      • 2.2.4.3: OWNet.pm
      • 2.2.4.4: OWNet.php
      • 2.2.4.5: ownet
  • 2.3: man pages: DS18xx
    • 2.3.1: DS18S20
    • 2.3.2: DS18B20
    • 2.3.3: DS1821
    • 2.3.4: DS1822
    • 2.3.5: DS1825
  • 2.4: man pages: DS19xx
    • 2.4.1: DS1904
    • 2.4.2: DS1920
    • 2.4.3: DS1921
    • 2.4.4: DS1963L
    • 2.4.5: DS1963S
    • 2.4.6: DS1977
    • 2.4.7: DS1982
    • 2.4.8: DS1985
    • 2.4.9: DS1986
    • 2.4.10: DS1990A
    • 2.4.11: DS1991
    • 2.4.12: DS1992
    • 2.4.13: DS1993
    • 2.4.14: DS1994
    • 2.4.15: DS1995
    • 2.4.17: DS1996
  • 2.5: man pages: DS24xx
    • 2.5.1: DS2401
    • 2.5.2: DS2404
    • 2.5.3: DS2405
    • 2.5.4: DS2406
    • 2.5.5: DS2408
    • 2.5.6: DS2409
    • 2.5.7: DS2413
    • 2.5.8: DS2415
    • 2.5.9: DS2417
    • 2.5.10: DS2423
    • 2.5.11: DS2430A
    • 2.5.12: DS2431
    • 2.5.13: DS2433
    • 2.5.14: DS2436
    • 2.5.15: DS2437
    • 2.5.16: DS2438
    • 2.5.17: DS2450
  • 2.6: man pages: DS25xx
    • 2.6.1: DS2502
    • 2.6.2: DS2505
    • 2.6.3: DS2506
  • 2.7: man pages: DS27xx
    • 2.7.1: DS2720
    • 2.7.2: DS2740
    • 2.7.3: DS2751
    • 2.7.4: DS2755
    • 2.7.5: DS2760
    • 2.7.6: DS2770
    • 2.7.7: DS2780
    • 2.7.8: DS2781
    • 2.7.12: DS2788
  • 2.8: man pages: Misc devices
    • 2.8.1: DS1427
    • 2.8.2: DS2890
    • 2.8.3: DS28E04
    • 2.8.4: DS28EA00
    • 2.8.5: DS28EC20
    • 2.8.6: LCD
    • 2.8.7: EEEF
    • 2.8.8: EDS00XX
    • 2.8.9: EDS0064
    • 2.8.10: EDS0065
    • 2.8.11: EDS0066
    • 2.8.12: EDS0067
    • 2.8.13: EDS0068
    • 2.8.14: EDS0070
    • 2.8.15: EDS0071
    • 2.8.16: mCM001
    • 2.8.17: mAM001
    • 2.8.18: mRS001
  • 2.9: OWTAP
    • 2.9.1: Main window
    • 2.9.2: Detail windows
    • 2.9.3: More details
    • 2.9.4: Message statistics
    • 2.9.5: Persistence windows
    • 2.9.6: Clients window
    • 2.9.7: Status window
  • 2.10: OWMON
    • 2.10.1: OWMON main window
    • 2.10.2: OWMON bus list
  • 2.11: Other software
    • 2.11.1: Weather -- OWFSWS
    • 2.11.2: FLI4L
    • 2.11.3: One Wire on Fire
• 3: Hardware
  • 3.1: Bus masters
    • 3.1.1: usb DS9490R
    • 3.1.2: usb ECLO
    • 3.1.3: usb MP00200
    • 3.1.4: i2c DS2482-100
      • 3.1.4.1: i2c parallel port design
      • 3.1.4.2: Advanced i2c
    • 3.1.5: i2c DS2482-800
    • 3.1.6: com DS9097 (passive)
    • 3.1.7: Fake adapter
    • 3.1.8: Tester adapter
    • 3.1.9: usb USB9097
    • 3.1.10: EtherWeather
    • 3.1.11: HA7Net
      • 3.1.11.1: address discovery
    • 3.1.12: LinkUSB
    • 3.1.13: HA7E
    • 3.1.14: LinkHub-E
    • 3.1.15: TAI603B
    • 3.1.16: OMAP
    • 3.1.17: W1 kernel driver
    • 3.1.18: OW-SERVER-ENET
      • 3.1.18.1: ENET FIRMWARE
      • 3.1.18.2: ENET Configuration
  • 3.2: Standard devices
    • 3.2.1: Family Code lookup
    • 3.2.2: Family Code list
  • 3.3: 3rd party devices
    • 3.3.1: LCD
    • 3.3.2: Thermocouples
      • 3.3.2.1: Type B
      • 3.3.2.2: Type E
      • 3.3.2.3: Type J
      • 3.3.2.4: Type K
      • 3.3.2.5: Type N
      • 3.3.2.6: Type R
      • 3.3.2.7: Type S
      • 3.3.2.8: Type T
    • 3.3.3: Locator
    • 3.3.4: Light sensor
    • 3.3.5: Weather Station
    • 3.3.6: Humidity
      • 3.3.6.1: Temperature compensation
      • 3.3.6.2: Datanab humidity sensor
    • 3.3.7: Voltage
    • 3.3.8: Barometer
    • 3.3.9: UVI
    • 3.3.10: Moisture
    • 3.3.11: CO2 sensor
    • 3.3.12: BAE0910
    • 3.3.13: 8 Channel I/O
    • 3.3.14: RTD sensor
    • 3.3.15: EDS enviromental sensors
    • 3.3.16: WS603 Weather Instrument
    • 3.3.17: Vibration Sensor
  • 3.4: Appliances
    • 3.4.1: NSLU2
    • 3.4.2: Wireless router
    • 3.4.3: OMAP
    • 3.4.4: WL-HDD
    • 3.4.5: FOX board
    • 3.4.6: Foxboard G20
    • 3.4.7: Dockstar
    • 3.4.8: SheevaPlug
    • 3.4.9: OpenMoko Freerunner
    • 3.4.10: Beaglebone black
    • 3.4.11: Raspberry Pi
  • 3.5: Hubs
    • 3.5.1: DS2409 microhub
    • 3.5.2: 4 Channel Hub
  • 3.6: Voltage table
  • 3.7: Switches
  • 3.8: Wiring standards
• 4: Examples
  • 4.1: Published articles...
    • 4.1.1: Linux Magazin by Michael Schilli (owperl) [German]
    • 4.1.2: Pyzine by Peter Kropf (owpython)
    • 4.1.3: Hack-A-Day
  • 4.2: Hardware and designs
    • 4.2.1: DS1821 Thermostat Circuit -- Doug Collinge
    • 4.2.2: Custom hardware -- William Robison
    • 4.2.3: Ideas and Prototypes -- Gregg Levine
    • 4.2.4: ASUS wireless -- Wim Heirman
    • 4.2.5: Fan and battery control -- Majek Wodzinski
    • 4.2.7: WRT router mods (Patryk)
  • 4.3: Home and Office
    • 4.3.1: Monitor a wine cellar
    • 4.3.3: Office monitoring -- Wim Heirman
    • 4.3.4: Solar Heating Control -- Christian Schumann and Christian Magnusson
    • 4.3.5: Home monitoring -- Paul Rimmer
    • 4.3.6: Automatizujeme domácnost I
    • 4.3.7: LCD temperature display
    • 4.3.8: Greenhouse control
    • 4.3.9: Home monitoring how-to -- Silvano Gai
  • 4.4: Aquarium
    • 4.4.1: Aquarium automation -- Rob Conway
    • 4.4.2: Reef Tank -- Scott Jilek
  • 4.5: Mobile
    • 4.5.3: Home Trailer -- Brian Fahrlander
  • 4.6: Industrial
    • 4.6.1: Hydroelectric plant
  • 4.7: Garden
• 5: Setup
  • 5.1: Setup
    • 5.1.1: MS Windows
      • 5.1.1.1: Windows USB
    • 5.1.2: Permissions
      • 5.1.2.1: Hotplug
      • 5.1.2.2: Fuse
    • 5.1.3: Database linkage
      • 5.1.3.1: Postgres and Python by Jerry Scharf
    • 5.1.4: Testing without hardware
    • 5.1.5: Aliases
      • 5.1.5.1: Alias improved
    • 5.1.6: Macintosh
    • 5.1.7: NetBSD
    • 5.1.8: Startup sequence
      • 5.1.8.1: Startup DS9097U
      • 5.1.8.2: Startup LINK emulate mode
      • 5.1.8.3: Startup LINK ascii mode
      • 5.1.8.4: Startup USB (DS9490R)
      • 5.1.8.5: Startup LinkUSB
      • 5.1.8.6: Startup Passive (9097)
      • 5.1.8.7: Startup HA5
      • 5.1.8.8: Startup HA7Net
      • 5.1.8.9: Startup OW-SERVER-ENET
      • 5.1.8.10: Startup owserver
      • 5.1.8.11: Startup Avahi
      • 5.1.8.12: Startup Fake
      • 5.1.8.13: Startup Mock
      • 5.1.8.14: Startup Tester
      • 5.1.8.15: Startup USB scan
    • 5.1.9: Command line
    • 5.1.10: Ubuntu setup
      • 5.1.10.1: Old Ubuntu
      • 5.1.10.2: Building under Ubuntu
    • 5.1.11: Git access
  • 5.2: Install
    • 5.2.1: Download
    • 5.2.2: Configuration
    • 5.2.3: NSLU2 (German)
      • 5.2.3.1: Initial NSLU2 preparation
      • 5.2.3.2: OWFS install step
  • 5.3: udev
    • 5.3.1: UDEV and USB
  • 5.4: Distributions
    • 5.4.1: Debian
    • 5.4.2: Slackware
    • 5.4.3: Gentoo
      • 5.4.3.1: Gentoo Scripts
  • 5.5: Bonjour (zeroconf)
    • 5.5.1: Bonjour library
    • 5.5.2: Avahi discovery
    • 5.5.3: FTP browsing
• 6: Display
  • 6.1: Javascript: Raphael.js
• 7: Advanced
  • 7.1: Cache
    • 7.1.1: Cache objects
    • 7.1.2: Cache flip
    • 7.1.3: Remote cache
    • 7.1.4: Cache Structure
  • 7.2: Error management
  • 7.3: owserver protocol
    • 7.3.1: Loop suppression
    • 7.3.2: tcp messages
    • 7.3.3: owserver flag word
    • 7.3.4: owserver message types
    • 7.3.5: Persistent connections
    • 7.3.6: owlib client persistence
    • 7.3.7: Directory Messages
  • 7.4: Binary sizes
  • 7.5: Porting
  • 7.6: Performance
  • 7.7: To Do
  • 7.8: Read and Write object
    • 7.8.1: struct owq_wire_query assumptions
    • 7.8.2: Object write process
    • 7.8.3: Object read process
  • 7.9: Directory locking
  • 7.10: slave support
    • 7.10.1: Slave code
  • 7.11: SNMP
  • 7.12: Structure Directory
  • 7.13: External sensor support
• 8: Help
  • 8.1: OWFS websites
  • 8.2: Source Availability and Information
    • 8.2.1: Browse source code
    • 8.2.2: git inspector
    • 8.2.3: Change log
  • 8.3: Search
  • 8.4: License
  • 8.5: Tutorial links
  • 8.6: Internal help
    • 8.6.1: Internal help=device
    • 8.6.2: Internal help=program
    • 8.6.3: Internal help=cache
    • 8.6.4: Internal help=job
    • 8.6.5: Internal help=temperature
  • 8.7: Maintainers
  • 8.8: Logo poll
  • 8.9: Quirks and Problems
    • 8.9.1: locks and unlocks
  • 8.10: FAQ
    • 8.10.1: What is 1-wire good for?
  • 8.11: Error codes
    • 8.11.1: Error numbers
  • 8.12: Debugging
    • 8.12.1: error_level
    • 8.12.2: error_print
    • 8.12.3: foreground
    • 8.12.4: debug
    • 8.12.5: detail

HIH Temperature Compensation

The Huneywell HIH humidity sensors have mild temperature variance in their measured relative humidity. The generic "humidity" uses the HIH-36XX calculation. Humidit4000 uses the calculation on the right.

According to the datasheets:

HIH-36xx	HIH-4000
RH = (Raw RH) /  ( 1.0546 - .00216 T )  T in Centigrade	RH = (Raw RH) /  ( 1.0305 + .000044 T - .0000011 T2 )  T in Centigrade