1-Wire
1-Wire is a very low-cost bus system, which was mainly developed and used for the acquisition of temperature values.
Example: Pre-assembled 1-Wire sensor. Flexible use, from the hollow wall socket (behind the switch) to the outdoor area.
Advantages
- Easy setup via Plug and Play
- Low cost
- Minimum power consumption less than 1mW
- Flexible cable laying
Characteristic data
- Up to max. 32 sensors can be connected to one server.
- Max. Total cable length 150 m
- Various wiring topologies: star, line, tree structure
Connection
- 5V supply voltage
- data cable
- GND
Wiring
Optionally, 1-Wire can also be used in “parasitic mode”, i.e. in 2-wire operation. Then the sensor uses the data line as power supply. In this case, however, a maximum of 20 sensors can be used for a total of 50 metres.
When connecting the sensors, it is essential to pay attention to the colour coding on the label. This can deviate from the picture.
Star wiring
Max. 10 sensors with max. 100m in total
Line with short branches
Max. 32 sensors with 150m in total
Tree structure
Max. 25 sensors with max. 100m in total
