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8.9 Connecting devices to 1-Wire interface
1-Wire allows to work with DS18B20 temperature sensors and iButton electronic identifiers.
There’s an ability to work with DS18B20 only in parasitic power mode. Connection is shown on
scheme:
Pic.19 Connecting temperature sensor to tracker 1-Wire input
It is possible to connect three sensors at the same time. Also, it’s possible to connect one iButton
device parallel to sensors.
Pic.20.Connecting several sensors to 1-Wire input
Data from sensors is shown in WIR1..WIR3 channels. iButton identifying number – IBT1.
There’s a parameter WIR_AUTOSEARCH, which allows searching for external sensors and
assigning channels to them automatically. Default value of this parameter is 1 (autosearch is
enabled). To disable it, change the value of parameter to 0 in configurator (“Settings” tab,
“Advanced” button).
In case of disabled autosearch, the manual setting of the channel is necessary. To set the channel
to the sensor, assign its ID to the corresponding parameter of the channel (as in pic.21)
