آموزش راه‌ اندازی سنسور رطوبت HR202L با آردوینو

#include <FreqCounter.h>
#include <stdlib.h>

#include <Wire.h>
#include <Adafruit_Sensor.h>
#include "Adafruit_BME680.h"

Adafruit_BME680 bme; // I2C

#define countdelay 1 // measurement delay
#define calibration 0 // adjusts frequency for variation in Arduino
#define gatetime 100 // gate time in milliseconds
#define onems 1000 // alias for 1000 milliseconds

char units[][5] = {"Hz", "KHz", "MHz"}; //units of frequency to be used later
float omega = 2 * PI*1000;
float impedance;


void setup() {
 Serial.begin(9600); // initialize the LCD
 while (!Serial);
 Serial.print("** HR202L Humidity Sensor **"); //initial message
 if (!bme.begin()) {
 Serial.println("Could not find a valid BME680 sensor, check wiring!");
 while (1);
 }

 // Set up oversampling and filter initialization
 bme.setTemperatureOversampling(BME680_OS_8X);
 bme.setHumidityOversampling(BME680_OS_2X);
 bme.setPressureOversampling(BME680_OS_4X);
 bme.setIIRFilterSize(BME680_FILTER_SIZE_3);
 bme.setGasHeater(320, 150); // 320*C for 150 ms
 delay(100); //100ms startup delay
}

void loop() {
 if (! bme.performReading()) {
 Serial.println("Failed to perform reading :(");
 return;
 }
 float temp = bme.temperature;
 unsigned long Fcalc = 0;
 float Fval;
 float capacitance;
 float Humidity;
 

 FreqCounter::f_comp = calibration; // calibrate with known source
 FreqCounter::start(gatetime); // count pulses for specified gating period
 while (FreqCounter::f_ready == 0)
 Fcalc = FreqCounter::f_freq;
 delay(countdelay);
 Fval = (float) Fcalc * (onems / gatetime); // scale the input

 
 capacitance = (1.44 * 1000000000000) / (260000 * Fval);//capacitance in pF
 impedance = 1/ (omega * capacitance)*1000000000000; //calculating the Impedance in Ohm

 if (temp > 0 && temp <= 5)
 Humidity = (6.8062 - log10(impedance)) / 0.04925 + 30;
 else if (temp > 5 && temp <= 10)
 Humidity = (7 - log10(impedance)) / 0.05039 + 25;
 else if (temp > 10 && temp <= 15)
 Humidity = (6.8451 - log10(impedance)) / 0.04882 + 25;
 else if (temp > 15 && temp <= 20)
 Humidity = (7 - log10(impedance)) / 0.04854 + 20;
 else if (temp > 20 && temp <= 25)
 Humidity = (6.8261 - log10(impedance)) / 0.04725 + 20;
 else if (temp > 25 && temp <= 30)
 Humidity = (6.699 - log10(impedance)) / 0.04854 + 20;
 else if (temp > 30 && temp <= 35)
 Humidity = (6.5911 - log10(impedance)) / 0.04561 + 20; 
 else if (temp > 35 && temp <= 40)
 Humidity = (6.4771 - log10(impedance)) / 0.04537 + 20;
 else if (temp > 40 && temp <= 45)
 Humidity = (6.3802 - log10(impedance)) / 0.04464 + 20;
 else if (temp > 45 && temp <= 50)
 Humidity = (6.2430 - log10(impedance)) / 0.04268 + 20;
 else if (temp > 50 && temp <= 55)
 Humidity = (6.1614 - log10(impedance)) / 0.04244 + 20;
 else if (temp > 55 && temp <= 60)
 Humidity = (6.0607 - log10(impedance)) / 0.04163 + 20;
 else if (temp > 60 && temp <= 65)
 Humidity = (5.9867 - log10(impedance)) / 0.04104 + 20;
 else {
 Serial.print("Out of Range");
 while (1);
 }
 Serial.print("Temp: ");
 Serial.print(temp);Serial.print('\t');
 Serial.print("Cap(pF): ");
 Serial.print(capacitance);Serial.print('\t');
 Serial.print("Humidity(%): ");
 Serial.print(Humidity);Serial.print('\t');
 Serial.print("Freq(Hz): ");
 Serial.println(Fval);
}