Thursday, November 26, 2020
Home Arduino Humidity Sensor HIH-4000 | Humidity Sensors

HIH-4000 | Humidity Sensors

The HIH-4000  sensors are one of the highly efficient humidity sensors you can buy. The HIH-4000 is an analog humidity sensor. It is useful for battery-operated portable systems. These are commercial sensors. It is manufactured for large scale volume OEM producers. It comes in Single In-line Package (SIP) providing high performance. This makes the sensor a reliable choice for commercial projects.
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HIH-4000
HIH4000

HIH-4000 Specifications:

  • Molded thermoset plastic housing
  • Near linear voltage output vs % RH
  • Laser trimmed interchangeability
  • Low power design
  • Enhanced accuracy
  • Fast response time
  • Stable, low drift performance
  • Chemically resistant

How does the HIH-4000  Works?

The HIH-4000 Humidity sensor works just like the HDC-1080 as both as a capacitive touch sensor. The sensor is an analog humidity sensor. It gives an analog output signal. The signal is multiplied with (4.32 / 1023.0). This will give the analog output value. It can be calibrated. by adding a coefficient, which can be derived from the datasheet.

Pin configuration:

The HIH-4000 has three pins which are

  • VCC
  • GND
  • OUT

HIH-4000 Humidity sensor
HIH4000 Pin configuration

Arduino Wiring:

First, Connect the Sensor GND to Arduino GND.

Second, Connect  Sensor Vcc+ to Arduino +5v

Lastly, Connect Resistance (Min 80k) across GND and Output

Arduino Code :

int HIH4000_Pin = A0; //analog pin 0

void setup(){
  Serial.begin(9600);
}

void loop(){

  //To calculate relative humidity, we need the temperature.
  float relativeHumidity  = analogRead(HIH4000_Pin);

 float av=0.0048875*relativeHumidity;
 
  float res=(av-0.86)/0.03;
Serial.println(res);
  delay(250); 
}

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