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SHT21 humidity and temperature sensor example

by shedboy71

The SHT21 is a low cost humidity and temperature sensor. Its an I2C device so again is very simple to connect to any arduino

The SHT2x sensors contain a capacitive type humidity sensor, a band gap temperature sensor and specialized analog and digital integrated circuit – all on a single CMOSens® chip. This yields in an unmatched sensor performance in terms of accuracy and stability as well as minimal power consumption.

UNO and SHT21

UNO and SHT21

This is the breakout for the sensor that I bought.

HTU21

HTU21

Here is a simple schematic, again be careful as Vcc is 3.3v with this device

Schematic

Lets look at the required libraries and a basic code example, there is not much to this to be honest most of the work is done in the library

 

Code

There are a couple of libraries to help you out

https://github.com/misenso/SHT2x-Arduino-Library
https://github.com/elechouse/SHT21_Arduino

I used the latter one

#include <Wire.h>
#include <SHT2x.h>
 
 
void setup()
{
  Wire.begin();
  Serial.begin(9600);
}
 
void loop()
{
  Serial.print("Humidity: ");
  Serial.println(SHT2x.GetHumidity());
  Serial.print("Temperature(C): ");
  Serial.println(SHT2x.GetTemperature());
  Serial.println();
  delay(1000);
}

 

Links

these come in at about $7 for a useful breakout board with this sensor

Humidity Sensor – SHT21 Breakout Board

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