GY-63_MS5611/libraries/DMM/DMM.cpp
Rob Tillaart dc533888ca 0.1.3 DMM
2023-10-19 15:19:50 +02:00

131 lines
1.9 KiB
C++

//
// FILE: DMM.cpp
// AUTHOR: Rob Tillaart
// VERSION: 0.1.3
// DATE: 2022-12-19
// PURPOSE: Library for a DMM class for Arduino UNO.
// URL: https://github.com/RobTillaart/DMM
#include "DMM.h"
DMM::DMM()
{
}
void DMM::begin(uint8_t pin, float maxVoltage, uint16_t maxSteps)
{
_pin = pin;
_maxVoltage = maxVoltage;
_maxSteps = maxSteps;
_voltageStep = _maxVoltage/_maxSteps;
}
void DMM::setMaxVoltage(float maxVoltage)
{
_maxVoltage = maxVoltage;
_voltageStep = _maxVoltage/_maxSteps;
}
float DMM::getMaxVoltage()
{
return _maxVoltage;
}
void DMM::setGain(float factor)
{
_gain = factor;
}
float DMM::getGain()
{
return _gain;
}
/////////////////////////////////////////////////
//
// READ VOLTAGE
//
float DMM::readVolts(uint8_t times)
{
uint32_t total = 0;
if (times == 0)
{
times = 1;
}
for (int i = 0; i < times; i++)
{
total += analogRead(_pin);
}
float volts = (total * _voltageStep) / times;
if (_gain != 1.0)
{
volts *= _gain;
}
return volts;
}
float DMM::readMilliVolts(uint8_t times)
{
return readVolts(times) * 1000.0;
}
float DMM::readNoise(uint8_t times)
{
uint16_t maxV = 0;
uint16_t minV = _maxSteps;
if (times == 0) times = 1;
for (int i = 0; i < times; i++)
{
uint16_t x = analogRead(_pin);
if (x > maxV) maxV = x;
if (x < minV) minV = x;
}
float v = ((maxV - minV) * _voltageStep) / times;
if (_gain != 1.0) v *= _gain;
return v;
}
/////////////////////////////////////////////////
//
// READ OHM
//
void DMM::setReferenceR(float ohm)
{
_ReferenceR = ohm;
}
float DMM::readOhm(uint8_t times)
{
float voltage = readVolts(times);
float R = _ReferenceR / voltage * _maxVoltage - _ReferenceR;
// float R = (_maxVoltage - voltage) * _ReferenceR / voltage;
return R;
}
float DMM::readKiloOhm(uint8_t times)
{
return readOhm(times) * 0.001;
}
// -- END OF FILE --