hello guys,
I want to use this humidity sensor using arduino i followed the insurrections in the link below but i dont know if i am getting the correct reading i compare it with the reading in the outside but its different i did not use a temperature sensor i just used a fixed number ?
Can someone help me please , is there a way to know if my reading is correct or is this way not correct which i am using ?
https://learn.sparkfun.com/tutorials/hih-4030-humidity-sensor-hookup-guide
I want to use this humidity sensor using arduino i followed the insurrections in the link below but i dont know if i am getting the correct reading i compare it with the reading in the outside but its different i did not use a temperature sensor i just used a fixed number ?
Can someone help me please , is there a way to know if my reading is correct or is this way not correct which i am using ?
https://learn.sparkfun.com/tutorials/hih-4030-humidity-sensor-hookup-guide
C:
/* **************************************************************************************
* HIH4030_HumiditySensor_Example.ino
* E.Robert @ SparkFun Electronics
* original creation date: November 5, 2016
* [URL]https://github.com/sparkfun/SparkFun_HIH4030_Arduino_Library[/URL]
*
* Functions: Allows you to set supply voltage, define whether or not a temperature
* sensor is being used, define static temperature value in absense of a
* temperature sensor, and utilize the equations supplied by the manufacturer
* to acquire accurate measurements of Relative Humidity (RH%).
*
* [URL]https://learn.sparkfun.com/tutorials/hih-4030-humidity-sensor-hookup-guide[/URL]
*
* Note: TMP102 Sensor is being used in this example as part of the
* SparkFun HIH-4030 Humidity Sensor Hookup Guide. However, other
* temperature sensors can also be used in this sketch by replacing
* the necessary code inside the getTemperature() function.
*
* Resources:
* Wire.h - Arduino I2C Library
* SparkFun_HIH4030.h - Arduino Library for SparkFun Humidity Sensor Breakout - HIH-4030
*
* Development environment specifics:
* Arduino 1.6.8
* SparkFun RedBoard
* SparkFun Real Time Clock Module (v14)
************************************************************************************** */
// Library Inclusions
#include <SparkFun_HIH4030.h>
#include <Wire.h>
// Example Variables
int tempAddress = 0x48; // I2C: TMP102 Slave Address with ADD0 Grounded
float temp = 0; // Temperature Value either Static or Sensor Reading
// Are You Using a Temperature Sensor? 1 = YES / 0 = NO
int tempSensor = 0;
// Analog IO Pin Connected to OUT
#define HIH4030_OUT A0
// Supply Voltage - Typically 5 V
#define HIH4030_SUPPLY 5
// Library Variables
HIH4030 sensorSpecs(HIH4030_OUT, HIH4030_SUPPLY);
void setup(void){
Serial.begin(9600); // Serial Port
Wire.begin(); // I2C: Utilized by TMP102 Temperature Sensor
}
/* Serial Output of Temperature C, Sensor Voltage V, SensorRH %, and TrueRH % */
void printData(HIH4030 sensor, float temperature){
Serial.print("Temperature = ");
Serial.print(temperature);
Serial.print(" C ("); Serial.print((temperature * 9/5) + 32); Serial.println(" F)");
Serial.print("Sensor Voltage = ");
Serial.print(sensor.vout());
Serial.println(" V");
Serial.print("Relative Humidity = ");
Serial.print(sensor.getSensorRH());
Serial.println(" %");
Serial.print("True Relative Humidity = ");
Serial.print(sensor.getTrueRH(temperature));
Serial.println(" %");
}
void loop(void){
/* IF tempSensor = 1 Utilizing a Temperature Sensor */
/* IF tempSensor = 0 Utilizing a Static Value for Temperature */
if (tempSensor == 1) {
temp = getTemperature(); // Get Temperature Sensor Reading
} else if (tempSensor == 0) {
temp = 8; // Static Temperature Value in C
// Set by User to Desired Temperature
} else {
while (tempSensor != 1 || tempSensor != 0){
Serial.println("ERROR: tempSensor Value Out of Range");
}
}
printData(sensorSpecs, temp); // Print Sensor Readings
Serial.println(""); // Return Space Between Readings
delay(1000); // Slow Down Serial Output
}
/* Only Called IF Temperature Sensor is Being Used */
float getTemperature(){
/* IF Temperature Sensor is different from the TMP102 and not */
/* utilizing I2C via the Wire.h library, replace the code */
/* within the getTemperature() function. */
Wire.requestFrom(tempAddress,2); // Wire.requestFrom(address, # of bytes to request)
byte MSB = Wire.read(); // Receive byte as MSB or left-most bit
byte LSB = Wire.read(); // Receive byte as LSB or right-most bit
/* TMP102 Temperature Register 12-bit, read-only, two's compliment for negative */
/* << is bit shift left ; >> is bit shift right ; | is bitwise OR */
/* Syntax: variable << number_of_bits */
/* variable >> number_of_bits */
int TemperatureSum = ((MSB << 8) | LSB) >> 4;
float celsius = TemperatureSum*0.0625; //One LSB equals 0.0625 C
return celsius;
}
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