Xytronix Research & Design, Inc. Page 13
WebRelay-10 Plus™ Users Manual
Figure 2.2e - Input Connector
Temperature/Humidity Sensor Connection
Temperature and/or humidity sensors can be used for monitoring environmental conditions. The digital sensors
use a one-wire data bus, which allows up to eight sensors to share the same terminals (+5V, Ground, Data).
Every sensor on the one-wire bus is assigned a unique serial number when it is manufactured. That number is
used to address the device during communication.
The sensors have three wires; the wire color is show in the table below.
Sensor Wire Color Connection
Red Vout
Black Gna
Blue (or White) Data
Figure 2.2f - Temperature Sensor
Multiple sensors can be connected in two ways, directly connected to the unit (star topology) or “daisy chained”
(linear topology) as shown in Figure 2.2g.
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