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Pressure.h
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Pressure.h
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/**
* MIT Emergency Ventilator Controller
*
* MIT License:
*
* Copyright (c) 2020 MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/**
* Pressure.h
* Calculates and stores the key pressure values of the breathing cycle.
*/
#ifndef Pressure_h
#define Pressure_h
#include "Arduino.h"
class Pressure {
public:
Pressure(int pin):
sense_pin_(pin),
current_(0.0),
current_peak_(0.0),
peak_(0.0),
plateau_(0.0),
peep_(0.0) {}
//Get pressure reading
void read() {
// read the voltage
int V = analogRead(sense_pin_);
float Pmin = -100.0; // pressure max in mbar
float Pmax = 100.0; // pressure min in mbar
float Vmax = 1024; // max voltage in range from analogRead
// convert to pressure
float pres = (10 * V/Vmax - 1) * (Pmax-Pmin)/8. + Pmin; //mmHg
// convert to cmH20
pres *= 1.01972;
// update peak
current_peak_ = max(current_peak_, pres);
current_ = pres;
}
const float& get() {
return current_;
}
void set_peak_and_reset() {
peak_ = current_peak_;
current_peak_ = 0.0;
}
void set_plateau() {
plateau_ = get();
}
void set_peep() {
peep_ = get();
}
const float& peak() { return peak_; }
const float& plateau() { return plateau_; }
const float& peep() { return peep_; }
private:
int sense_pin_;
float current_;
float current_peak_;
float peak_, plateau_, peep_;
};
#endif