1-Wire MicroLAN Sensor Network

Prevodniky

DS9490R

lsusb: ID 04fa:2490 Dallas Semiconductor DS1490F 2-in-1 Fob, 1-Wire adapter

RS232

http://www.root.cz/clanky/internetovy-termostat-stavba-site-teplotnich-cidel-na-1-wire-sbernici/

Sensory

DS18B20

How to tell fake DS18B20 from original

Test	Original	chinese fake	note
Diode test + lead on DQ - lead on DCC	NC	approx 1.4V drop	MOST IMPORTANT TEST! This is why it shorts bus in parasitic mode.
Diode test - lead on DQ + lead on GND	0.65V drop	0.74V drop
parasitic power mode	works	does not work and shorts whole bus
default errata/trim value in OWFS	random number from 0 to 65535??	always 65535	I am not sure about this, but it looks like original sensors are factory trimmed, but fake are only faking the trim value. These two are probably only way to get list of suspicious devices in your network.
default templow/temphigh value in OWFS	70/75??	-1/-1
accuracy	factory trimmed	probably worse	I've put original right next to fake and they were 0.5 degrees C off. But i haven't done any systematical testing.
visage	sligthly darker, smaller, clear letters, small "P" letter on back	label is slightly off sometimes
price	???	starts at $0.7

Síť

Konektory
RJ45	RJ11	DS18B20 pin
green-white	1	-	Not Used
blue	2	Data	2	Transmit Data
blue-white	3	GND	1	Ground
green	4	+5V	3	Power

Rozbočovače

Software

OWFS

owfs=/mnt/1wire mkdir -p "$owfs" owfs --allow_other -u -a /etc/owfs-alias.conf -m "$owfs"
2894A40700008055=outdoor_backyard 28067A010000807F=ac_out_cold 285DCF0300008033=ac_out_hot 28E378010000803E=ac_daitsu_cold_in 28504B01000080AA=ac_daitsu_cold_out 28208C0300008046=ac_daitsu_cold_coil 28D47E03000080CD=ac_daitsu_hot_out 286C79010000803D=ceiling_hall 28185601000080EE=ceiling_row_1 287CA20700008041=ceiling_row_2 28ECA107000080BE=rack_2_top 28B9850100008095=rack_2_floor

Munin