The 1-wire network is a communications bus system designed by someone(?) at Dallas Semiconductor (now part of Maxim Integrated) that provides low-speed data, signaling, and power, using up a total of one pin on the CPU no matter how many peripheral chips are on that bus. (Other ways of connecting a peripheral to the CPU either require another pin for each peripheral, or require more pins for the first peripheral, or both).
The 1-wire network is perhaps the most popular way to measure temperatures at many different locations and send that data back to one central processor.
It makes it easier to troubleshoot if each PCB has 2 RJ45 connectors (or a dual RJ45 connector), with 1 LED indicating power and 1 LED indicating 1-wire signals.
For clarity each of the 8 wires from the standard 1WRJ45 connector may be labeled with the following 2-letter PCB silkscreen abbreviation:
1 5R (VCC return) 2 +5 (VCC power) 3 AR (Analog return) (?) 4 OW (one-wire I/O) 5 OR (one-wire return) 6 AS (Analog signal) (?) 7 +V (V raw power) 8 VR (V raw return)
Bich Pham. "One-Wire Serial Bus Carries Isolated Power And Data". http://electronicdesign.com/power/one-wire-serial-bus-carries-isolated-power-and-data The same circuit is also shown in "APPLICATION NOTE 3754: Single-Wire Serial Bus Carries Isolated Power and Data" http://www.maximintegrated.com/app-notes/index.mvp/id/3754 uses a MAX845 transformer driver and a transformer to send power and data from the host to the parasitic-power 1-wire device, and an optocoupler to send data from the 1-wire device back to the host.
- 1-Wire File System (OWFS): "1-Wire Hubs" describes several types of 1-wire hubs.
- "SIMAT Electronic Projects" has many links to 1-wire hubs, 1-wire weather station, other 1-Wire Projects, etc.
- The hw-group publishes "Poseidon HW interfaces for sensor connecting" which has a good description of 1-wire bus on RJ11 connectors and RS-485 bus on RJ45 connectors, as used on their "Sensors, Detectors and accessories".
- The "midon design: 1-Wire Application Guide" lists many tips for wiring up a 1-wire bus, including "some popular connector schemes" on 4-wire, 6-wire, and 8-wire connectors.
- The "Shelly Park Weather Station" uses a bunch of 1-wire sensors connected to a 1-wire hub.
- BeeHiveSleuth: "My 1-Wire Setup" has detailed photos of a 1-wire network, including temperature sensors inside a bee hive.
- Bernhard Linke. Maxim "Application note 5134: Implementing an Isolated 1-Wire Bus".
- 1-Wire File System (OWFS): http://owfs.org/
- has more information on 1-wire bus wiring standards using RJ-11 or RJ45 connectors.
- The main page for using Arduino with 1-wire devices: http://playground.arduino.cc/Learning/OneWire
- read and write 1-wire devices with an 8-bit AVR microcontroller.
- Protocol Tool supports many protocols, including 1-wire.
Is it true that "IEEE 1451.4 uses the Dallas Semiconductor "one-wire" interface" ?