NoticeDifference between revisions of "Sonoff Sensor Si7021"
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| Stability || || — || ≤0.01 || — || ℃/yr | | Stability || || — || ≤0.01 || — || ℃/yr | ||
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| + | [[File:Si7021_hum_figure_1.jpg|600px]] | ||
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| + | ''Figure 1. RH Accuracy at 30℃'' | ||
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| + | [[File:Si7021_temp_figure_2.jpg|600px]] | ||
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| + | ''Figure 2. Temperature Accuracy'' | ||
==Hardware== | ==Hardware== | ||
Revision as of 07:51, 21 July 2017
Contents
Overview
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 TH10/TH16.
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. | 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 | ||||
| Temperture 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
