Difference between revisions of "Sonoff Sensor Si7021"

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==Overview==
 
==Overview==
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[[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.
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[[File:Sonoff_TH_sensor_Si7021_02.jpg|thumb|400px|right]]
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[[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, S22 Socket.
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Go shopping [https://www.itead.cc/sonoff-th.html Sonoff Si7021(SKU:IM160712005) ]
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==Features==
 
==Features==
 
*Relative humidity and temperature measurement
 
*Relative humidity and temperature measurement
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| Voltage input || VCC || style="text-align:right" | 2.2 || 3.3 || style="text-align:right" | 3.6 || V
 
| Voltage input || VCC || style="text-align:right" | 2.2 || 3.3 || style="text-align:right" | 3.6 || V
 
|-
 
|-
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| Operating temp. || Ta || style="text-align:right" | -40 || - || style="text-align:right" | +85 || ℃
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| Operating temp. & Measuring range || Ta || style="text-align:right" | -40 || - || style="text-align:right" | +85 || ℃
 
|-
 
|-
 
| Storage temp. || Ta || style="text-align:right" | -65 || - || style="text-align:right" | +150 || ℃
 
| Storage temp. || Ta || style="text-align:right" | -65 || - || style="text-align:right" | +150 || ℃
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| Stability ||  || — || ≤0.01 || — || ℃/yr
 
| Stability ||  || — || ≤0.01 || — || ℃/yr
 
|}
 
|}
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[[File:Si7021_hum_figure_1.jpg|700px]]
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''Figure 1. RH Accuracy at 30℃''
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[[File:Si7021_temp_figure_2.jpg|700px]]
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''Figure 2. Temperature Accuracy''
  
 
==Hardware==
 
==Hardware==
 
===Interface Description===
 
===Interface Description===
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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.
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[[File:Si7021_Interface_description.png|700px]]
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===Audio Connector===
 
===Audio Connector===
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[[File:Si7021_audio_connector.jpg|700px]]
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==Pins==
 
==Pins==
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{| class="wikitable"
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! scope="col" | Pin || scope="col" | Name || scope="col" | Description
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|-
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| style="text-align:right" | 1 || VCC || Power supply 2.2~3.6VDC
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|-
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| style="text-align:right" | 2 || GND || GND
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|-
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| style="text-align:right" | 3 || NC || NC
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|-
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| style="text-align:right" | 4 || DATA || Single bus, data port
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|}
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==Downloads==
 
==Downloads==
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[[:File:Sonoff Si7021 Sensor_Schematic.pdf | Sonoff Si7021 Sensor Schematic]]

Latest revision as of 01:59, 12 September 2017

Overview

Sonoff TH sensor Si7021 02.jpg

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, S22 Socket.

Go shopping Sonoff Si7021(SKU:IM160712005)

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
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

Si7021 hum figure 1.jpg

Figure 1. RH Accuracy at 30℃

Si7021 temp figure 2.jpg

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.

Si7021 Interface description.png

Audio Connector

Si7021 audio connector.jpg

Pins

Pin Name Description
1 VCC Power supply 2.2~3.6VDC
2 GND GND
3 NC NC
4 DATA Single bus, data port

Downloads

Sonoff Si7021 Sensor Schematic

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