Sonoff Si7021 Temperature and Humidity Sensor is a digital temperature and humidity sensor with a calibrated digital signal output. It adopts dedicated digital module acquisition technology and temperature&humidity sensing technology to ensure that the sensor has a very high reliability and excellent long-term stability. The sensor includes an integrated single-chip temperature and humidity sensor chip, which connects to a high-performance 8-bit MCU. The Si7021 sensor has advantages such as excellent quality, ultra-fast response, anti-interference ability and cost-effective. The sensor has 2.5mm 4-pole stereo audio male plug connector, which works perfectly with Sonoff TH16, S22 Socket.
Features
Relative humidity and temperature measurement
All calibrated, digital output
Good long-term stability
No additional parts required
Ultra-low energy consumption
The sensor is fully interchangeable
Electrical Characteristics
Rated Parameters
Parameter
Symbol
Min
Typ
Max
Unit
Voltage input
VCC
2.2
3.3
3.6
V
Operating temp. & Measuring range
Ta
-40
–
+85
℃
Storage temp.
Ta
-65
–
+150
℃
Performance parameters
Parameter
Condition
Min
Typ
Max
Unit
Humidity
Operating range
0
—
100
%RH
Accuracy
0-80
—
±2
±3
%RH
80-100
See Figure 1
Temperature drift
—
0.05
—
%RH/℃
Stability
—
≤0.25
—
%RH/yr
Temperature
Operating range
-40
—
+85
℃
Accuracy
-10≤Ta≤85
—
±0.3
±0.4
℃
-40≤Ta≤125
See Figure 2
Stability
—
≤0.01
—
℃/yr
Figure 1. RH Accuracy at 30℃
Figure 2. Temperature Accuracy
Hardware
Interface Description
It is recommended that the DATA pin use a 10K pull-up resistor and a 100nF capacitor can be added between the power supply pins (VCC, GND) for decoupling.
Audio Connector
Pins
Pin
Name
Description
1
VCC
Power supply 2.2~3.6VDC
2
GND
GND
3
NC
NC
4
DATA
Single bus, data port
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