NickPGSmith: /* Usage */

2024-05-15T13:44:57Z

Usage

← Older revision		Revision as of 13:44, 15 May 2024
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	\|Lower resolution measurements (faster).		\|Lower resolution measurements (faster).
	\|-		\|-
	\|		\| \|\|power\|\|1 if on power, 0 if parasitic
	\|power
	\|1 if on power, 0 if parasitic
	\|-		\|-
	\|/run/owfs/20.X		\|/run/owfs/20.X\|\| \|\|Base for DS2450
	\|
	\|Base for DS2450
	\|-		\|-
	\|		\| \|\|volt.A\|\|Voltage measurement for channel A (similar for B-D)
	\|volt.A
	\|Voltage measurement for channel A (similar for B-D)
	\|-		\|-
	\|		\| \|\|volt.ALL\|\|All voltage measurements for A-D (CSV)
	\|volt.ALL
	\|All voltage measurements for A-D (CSV)
	\|-		\|-
	\|		\| \|\| \|\|
	\|
	\|

	\|}		\|}

NickPGSmith: /* USB to 1-Wire converter */

2024-05-15T13:43:16Z

USB to 1-Wire converter

← Older revision		Revision as of 13:43, 15 May 2024
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	!Name		!Name
	!Function		!Function

	\|-		\|-
	\|1		\|1 \|\| 3 \|\|3 \|\| V<sub>DD</sub> \|\| Power 5 V DC
	\|3
	\|3
	\|V<sub>DD</sub>
	\|Power 5 V DC
	\|-		\|-
	\|2		\|2 \|\| 1 \|\| GND \|\| Power Ground
	\|1
	\|
	\|GND
	\|Power Ground
	\|-		\|-
	\|3		\|3 \|5 \|\|2 \|\|OW \|\|1-Wire Data
	\|5
	\|2
	\|OW
	\|1-Wire Data
	\|-		\|-
	\|4		\|4 \|\| 4 \|\| 1 \|\| GND_OW \|\|1-Wire Return
	\|4
	\|1
	\|GND_OW
	\|1-Wire Return
	\|-		\|-
	\|5		\| 5 \|\| \|\| \|SUSO \|\| USB Suspend
	\|
	\|
	\|SUSO
	\|USB Suspend
	\|-		\|-
	\|6		\|6 \|\| \|\| \|\| \|\|
	\|
	\|
	\|
	\|

	\|}		\|}

NickPGSmith: /* Hardware */

2024-05-09T05:05:07Z

Hardware

← Older revision		Revision as of 05:05, 9 May 2024
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	=== USB to 1-Wire converter ===		=== USB to 1-Wire converter ===

	[[File:DS2490R_Schematic.png\|thumb]]		[[File:DS2490R_Schematic.png\|thumb]]

NickPGSmith: 2 revisions imported

2024-05-08T04:53:32Z

2 revisions imported

← Older revision	Revision as of 04:53, 8 May 2024
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NickPGSmith: 1 revision imported

2023-02-17T21:02:04Z

1 revision imported

← Older revision	Revision as of 21:02, 17 February 2023
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NickPGSmith: /* USB to 1-Wire converter */

2021-05-23T16:02:17Z

USB to 1-Wire converter

New page

== Hardware ==

See Maxim's [https://www.maximintegrated.com/en/products/digital/one-wire.html website].

=== USB to 1-Wire converter ===

[[File:DS2490R_Schematic.png|thumb]]

* [http://www.maximintegrated.com/datasheet/index.mvp/id/3834 DS9490R], recommended external power load is limited to 25 mA.
* 10 Ω in series with OW line
* Application note on [https://www.maximintegrated.com/en/app-notes/index.mvp/id/148 Network Topologies]

{| class="wikitable"

!RJ11
!5-pin DIN
!3-pin Mini DIN
!Name
!Function
|-
|1
|3
|3
|V<sub>DD</sub>
|Power 5 V DC
|-
|2
|1
|
|GND
|Power Ground
|-
|3
|5
|2
|OW
|1-Wire Data
|-
|4
|4
|1
|GND_OW
|1-Wire Return
|-
|5
|
|
|SUSO
|USB Suspend
|-
|6
|
|
|
|

|}

=== Temperature Sensor ===

[https://datasheets.maximintegrated.com/en/ds/DS18S20.pdf DS18S20] / [https://datasheets.maximintegrated.com/en/ds/DS18B20.pdf DS18B20]

* When used in parasitic mode, tie VDD and GND together
* Reads 85 C as an error condition: some OW communication is possible but proper temperature conversion failed.

=== ADC===

[https://datasheets.maximintegrated.com/en/ds/DS2450.pdf DS2450]

=== Switch ===

[https://pdfserv.maximintegrated.com/en/ds/DS2405.pdf DS2405]

== Kernel Module ==

* Modules:
** wire (w1_smem, w1_therm)
** ds2490
* Devices in: /sys/bus/w1/devices
* [https://github.com/bcl/digitemp/blob/master/README README]

== Digitemp ==

Initialise RC file with all supported devices:

# digitemp_DS2490 -i -d 1 -n 0
DigiTemp v3.5.0 Copyright 1996-2007 by Brian C. Lane
GNU Public License v2.0 - http://www.digitemp.com
Found DS2490 device #1 at 001/003
Turning off all DS2409 Couplers
..
Searching the 1-Wire LAN
28EEC13522160223 : DS18B20 Temperature Sensor
ROM #0 : 28EEC13522160223
Wrote .digitemprc

Walk device tree and show devices on the bus:

# digitemp_DS2490 -w
DigiTemp v3.5.0 Copyright 1996-2007 by Brian C. Lane
GNU Public License v2.0 - http://www.digitemp.com
Found DS2490 device #1 at 001/003
Turning off all DS2409 Couplers
..
Devices on the Main LAN
28EEC13522160223 : DS18B20 Temperature Sensor
81DAA024000000EC : Unknown Family Code

Show all devices with output format 1:

# digitemp_DS2490 -qa -o 1
Jul 15 15:26:56 Sensor 0 C: 85.00 F: 185.00

== OWFS ==

=== Installation on Fedora 25 ===

Install [http://owfs.org/ OWFS] packages, enable and start services:

dnf install owfs-server owfs-libs owfs-fs

Config file:
* /usr/lib/systemd/system/owserver.service

Options:
* --w1 which uses the kernel ds2490 driver or
* --usb=all to use all USB devices directly

Enable and start:
systemctl enable owserver owfs
systemctl start owserver
systemctl start owfs

=== Usage ===

Data appears under /run/owfs (and also /run/owfs/uncached). Default caching time: 10 s. For example (X is the OW hardware address):

{| class="wikitable"

!Directory
!File
!Notes
|-
|/run/owfs/settings/units
|pressure_scale
|eg "mbar"
|-
|
|temperature_scale
|eg "C"
|-
|/run/owfs/81.X
|
|Base for DS9490R
|-
|/run/owfs/10.X
|
|Base for DS18S20
|-
|
|temperature
|Temperature, 1s conversion time, floating point.
|-
|
|power
|1 if on power, 0 if parasitic
|-
|/run/owfs/28.X
|
|Base for DS18B20
|-
|
|temperature
|Temperature, 1s conversion time, floating point, 12 bit resolution.
|-
|
|temperature9, 10, 11
|Lower resolution measurements (faster).
|-
|
|power
|1 if on power, 0 if parasitic
|-
|/run/owfs/20.X
|
|Base for DS2450
|-
|
|volt.A
|Voltage measurement for channel A (similar for B-D)
|-
|
|volt.ALL
|All voltage measurements for A-D (CSV)
|-
|
|
|

|}

My devices:
* 20.D02805000000 : Hub internal ADC
* 28.EEC135221602 : Hub internal thermometer

=== Maxim SDKs ===

Can be obtained [http://www.maximintegrated.com/products/ibutton/software/sdk/sdks.cfm here].

1-Wire - Revision history

NickPGSmith: /* Usage */

NickPGSmith: /* USB to 1-Wire converter */

NickPGSmith: /* Hardware */

NickPGSmith: 2 revisions imported

NickPGSmith: 1 revision imported

NickPGSmith: /* USB to 1-Wire converter */