SHT21 humidity and temperature sensor example

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

This is the breakout for the sensor that I bought.

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

Source code

#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