TrafagPressureSensor.h

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/* Copyright (c) 2024 Skyward Experimental Rocketry
 * Author: Davide Mor
 *
 * 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
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 * THE SOFTWARE.
 */
 
#pragma once
 
#include <sensors/Sensor.h>
#include <sensors/SensorData.h>
 
#include <functional>
 
namespace Boardcore
{
 
class TrafagPressureSensor : public Sensor<PressureData>
{
public:
    TrafagPressureSensor(std::function<ADCData()> getVoltage,
                         float shuntResistance, float maxPressure,
                         float minCurrent = 4, float maxCurrent = 20)
        : getVoltage{getVoltage}, shuntResistance{shuntResistance},
          maxPressure{maxPressure}, minCurrent{minCurrent},
          maxCurrent{maxCurrent}
    {
    }
 
    bool init() override { return true; }
 
    bool selfTest() override { return true; }
 
protected:
    PressureData sampleImpl() override
    {
        auto voltage = getVoltage();
        return {voltage.voltageTimestamp, voltageToPressure(voltage.voltage)};
    }
 
private:
    float voltageToPressure(float voltage)
    {
        // First convert voltage to current
        float current = (voltage / shuntResistance) * 1000.0f;
 
        // Convert to a value between 0 and 1
        float value = (current - minCurrent) / (maxCurrent - minCurrent);
 
        // Scale from 0 to maxPressure
        return value * maxPressure;
    }
 
    std::function<ADCData()> getVoltage;
 
    const float shuntResistance;
    const float maxPressure;
    const float minCurrent;
    const float maxCurrent;
};
 
}  // namespace Boardcore