HP20x_demo.ino

/*
    Demo name   : HP20x_dev demo
    Usage       : I2C PRECISION BAROMETER AND ALTIMETER [HP206C hopeRF]
    Author      : Oliver Wang from Seeed Studio
    Version     : V0.1
    Change log  : Add kalman filter 2014/04/04
*/

#include <HP20x_dev.h>
#include "Arduino.h"
#include "Wire.h"
#include <KalmanFilter.h>
unsigned char ret = 0;

/* Instance */
KalmanFilter t_filter;    //temperature filter
KalmanFilter p_filter;    //pressure filter
KalmanFilter a_filter;    //altitude filter


void setup() {
    Serial.begin(9600);        // start serial for output

    Serial.println("****HP20x_dev demo by seeed studio****\n");
    Serial.println("Calculation formula: H = [8.5(101325-P)]/100 \n");
    /* Power up,delay 150ms,until voltage is stable */
    delay(150);
    /* Reset HP20x_dev */
    HP20x.begin();
    delay(100);
}


void loop() {
    Serial.println("------------------\n");
    long Temper = HP20x.ReadTemperature();
    Serial.println("Temper:");
    float t = Temper / 100.0;
    Serial.print(t);
    Serial.println("C.\n");
    Serial.println("Filter:");
    Serial.print(t_filter.Filter(t));
    Serial.println("C.\n");

    long Pressure = HP20x.ReadPressure();
    Serial.println("Pressure:");
    t = Pressure / 100.0;
    Serial.print(t);
    Serial.println("hPa.\n");
    Serial.println("Filter:");
    Serial.print(p_filter.Filter(t));
    Serial.println("hPa\n");

    long Altitude = HP20x.ReadAltitude();
    Serial.println("Altitude:");
    t = Altitude / 100.0;
    Serial.print(t);
    Serial.println("m.\n");
    Serial.println("Filter:");
    Serial.print(a_filter.Filter(t));
    Serial.println("m.\n");
    Serial.println("------------------\n");

    delay(1000);
}