Climatic change has received much attention Nowadays. We have already seen that works are facing immense problems because of climate change. And, therefore, people on this earth need to stay updated about the weather. So, for that purpose weather stations are getting more attention. These weather stations use sensors to serve the purpose. For example, environmental humidity and temperature sensors are used for measurements at any place and present them in real-time
An Overview of SHT71 Sensor
SHT 11 belongs to the SHT7x series of digital humidity & temperature sensors. They coupled both the humidity and temperature sensors contained to a 14-bit Analog to digital converter and a serial interface circuit. It measures humidity using a capacitive sensor while it measures the temperature using a band-gap sensor. The SHT7x devices offer fast response, great signal quality, and protection against external disturbances. SHT7x temperature and humidity have great application in the automotive industry, weather forecasting stations, medical, etc.
Hardware Overview
With a temperature and humidity sensor, the chip incorporates an amplifier, Analog to digital converter, digital interface, OTP memory. While they made the sensor of a CMOS chip, the sensor housing comprises an LCP cap with epoxy glob top on an FR-4 substrate. They made pins of a Copper/Beryllium alloy coated with Nikel and Gold.
Features and Specifications of SHT71 Sensor
Features
- Compact package
- 2-wire serial interface
- Fully calibrated
- Digital output
- Low power
- Long-term stability
- Supply voltage range: 2.4 V to 5.5 V
- Automatic power down
Specifications
- Relative humidity accuracy of ±3%RH
- Low power consumption and excellent long term stability
- 0.05%RH (12bit) relative humidity resolution
- 0.01°C (14bit) temperature resolution
- Temperature accuracy of ±0.4°C
- Operating relative humidity range from 0%RH to 100 %RH
- Relative humidity response time of 8s
- Operating temperature range from -40°C to 123.8°C
- Temperature response time of 5s to 30s
- Supply voltage range from 2.4V to 5.5V
Pinout SHT71
| Pin Number | Name | Description |
| 1 | SCK | Input Serial clock used to synchronize the communication between microcontroller and sensor |
| 2 | VDD | Supply voltage must be between 2.4 and 5.5V |
| 3 | GND | Ground |
| 4 | DATA | Serial Data, is used to transfer data in and out of the sensor |
Applications SHT71 Sensor
Embedded systems
This SHT71 Sensor is useful for the advancement of embedded systems for monitoring environmental parameters like humidity and temperature
Weather Monitoring and Reporting System
Through IOT based Weather monitoring and reporting system, one can collect, convert, evaluate, and produce calculated data on a web server.
