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AQI: Adding ugm3 calculation to ppd42ns and aqi calculation to upm_utilities

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Contributions by: Rex Tsai <rex.cc.tsai@gmail.com>

Signed-off-by: Abhishek Malik <abhishek.malik@intel.com>
This commit is contained in:
Abhishek Malik
2017-02-10 11:49:11 -08:00
parent b9988469ba
commit 7a60cd5abe
4 changed files with 79 additions and 2 deletions
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36
src/utilities/upm_utilities.c
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@ -1,7 +1,9 @@
/*
* Authors:
* Jon Trulson <jtrulson@ics.com>
* Copyright (c) 2016 Intel Corporation.
* Contributions: Rex Tsai <rex.cc.tsai@gmail.com>
* Abhishek Malik <abhishek.malik@intel.com>
* Copyright (c) 2017 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
@ -32,6 +34,22 @@
#include <upm_platform.h>
#include <upm_utilities.h>
// https://airnow.gov/index.cfm?action=aqibasics.aqi
static struct aqi {
float clow;
float chigh;
int llow;
int lhigh;
} aqi[] = {
{0.0, 12.4, 0, 50},
{12.1, 35.4, 51, 100},
{35.5, 55.4, 101, 150},
{55.5, 150.4, 151, 200},
{150.5, 250.4, 201, 300},
{250.5, 350.4, 301, 350},
{350.5, 500.4, 401, 500},
};
void upm_delay(unsigned int time)
{
if (time <= 0)
@ -246,3 +264,19 @@ uint32_t upm_elapsed_us(upm_clock_t *clock)
return elapsed;
#endif
}
int upm_ugm3_to_aqi (double ugm3)
{
int i;
for (i = 0; i < 7; i++) {
if (ugm3 >= aqi[i].clow &&
ugm3 <= aqi[i].chigh) {
// Ip = [(Ihi-Ilow)/(BPhi-BPlow)] (Cp-BPlow)+Ilow,
return ((aqi[i].lhigh - aqi[i].llow) / (aqi[i].chigh - aqi[i].clow)) *
(ugm3 - aqi[i].clow) + aqi[i].llow;
}
}
return 0;
}

13
src/utilities/upm_utilities.h
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@ -1,7 +1,9 @@
/*
* Authors:
* Jon Trulson <jtrulson@ics.com>
* Copyright (c) 2016 Intel Corporation.
* Contributions: Rex Tsai <rex.cc.tsai@gmail.com>
* Abhishek Malik <abhishek.malik@intel.com>
* Copyright (c) 2017 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
@ -113,6 +115,15 @@ uint32_t upm_elapsed_ms(upm_clock_t *clock);
*/
uint32_t upm_elapsed_us(upm_clock_t *clock);
/**
* Return the AQI (based on EPA standards) using the ugm3 value
* calculated by the sensor module.
*
* @param ugm3 micrograms per cubic meter
* @return calculated AQI
*/
int upm_ugm3_to_aqi (double ugm3);
#ifdef __cplusplus
}
#endif