forked from mpusz/mp-units
64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
/*
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Copyright (c) 2003-2020 Andy Little.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see http://www.gnu.org/licenses./
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*/
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/*
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capacitor discharge curve using compile_time
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physical_quantities
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*/
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#include <units/generic/dimensionless.h>
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#include <units/isq/dimensions/electric_current.h>
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#include <units/isq/si/capacitance.h>
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#include <units/isq/si/resistance.h>
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#include <units/isq/si/time.h>
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#include <units/isq/si/voltage.h>
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#include <units/math.h> // IWYU pragma: keep
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#include <units/quantity_io.h>
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#include <iostream>
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int main()
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{
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using namespace units::isq;
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using namespace units::isq::si::references;
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std::cout << "mp-units capacitor time curve example...\n";
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std::cout.setf(std::ios_base::fixed, std::ios_base::floatfield);
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std::cout.precision(3);
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constexpr auto c = 0.47 * uF;
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constexpr auto v0 = 5.0 * V;
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constexpr auto r = 4.7 * kR;
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for (auto tt = 0 * ms; tt <= 50 * ms; ++tt) {
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const Voltage auto vt = v0 * units::exp(-tt / (r * c));
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std::cout << "at " << tt << " voltage is ";
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if (vt >= 1 * V)
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std::cout << vt;
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else if (vt >= 1 * mV)
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std::cout << quantity_cast<si::millivolt>(vt);
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else if (vt >= 1 * uV)
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std::cout << quantity_cast<si::microvolt>(vt);
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else if (vt >= 1 * nV)
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std::cout << quantity_cast<si::nanovolt>(vt);
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else
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std::cout << quantity_cast<si::picovolt>(vt);
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std::cout << "\n";
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}
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}
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