Zajímavé odkazy
- Linux
- CZfree
- OpenSource SW
- HomeOffice
- Ostatní
- Zajímavosti
Uživatelské nástroje
Postranní lišta
howto:electro:1-wire
Obsah
1-Wire MicroLAN Sensor Network
Prevodniky
DS9490R
lsusb: ID 04fa:2490 Dallas Semiconductor DS1490F 2-in-1 Fob, 1-Wire adapter
RS232
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 $0.7 |
Síť
| Konektory | ||||
|---|---|---|---|---|
| RJ45 | RJ11 | DS18B20 pin | ||
| green-white | 1 | - | Not Used | |
| blue | 2 | Data | 2 | Transmit Data |
| blue-white | 3 | GND | 1 | Ground |
| green | 4 | +5V | 3 | Power |
Rozbočovače
Software
OWFS
- /etc/rc.local
owfs=/mnt/1wire mkdir -p "$owfs" owfs --allow_other -u -a /etc/owfs-alias.conf -m "$owfs"
- /etc/owfs-alias.conf
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
howto/electro/1-wire.txt · Poslední úprava: 2016/04/07 17:37 autor: 127.0.0.1
Kromě míst, kde je explicitně uvedeno jinak, je obsah této wiki licencován pod následující licencí: CC Attribution-Share Alike 4.0 International
