public static long cal_inv(double temperature, double RW = 100, string METHOD = "poly3",
double R1 = 10, double R2 = 10, double R3 = 10)
{
double rx;
if (METHOD == "linear")
{
rx = LINEAR.caly(temperature) / 1000;
}
else
{
rx = POLY3.caly(temperature) / 1000;
}
double v_rxr1 = VREF_R * R1 / (rx + R1);
double v_r2r3 = VREF_R * R3 / (R2 + R3);
double ad_input = ((double)10 / 3 + 1 / RW * 200 / 3) * (v_r2r3 - v_rxr1);
if (ad_input >= AD_MAX)
{
ad_input = AD_MAX;
}
else if (ad_input <= 0)
{
ad_input = 0;
}
long ret = (long)Math.Round((ad_input / VREF_AD) * AD_MAX);
return(ret);
}
public static long cal_inv_by_pts(double temperature, List <double> para, string METHOD = "poly3", double R1 = 10)
{
double rx;
if (METHOD == "linear")
{
rx = LINEAR.caly(temperature) / 1000;
}
else
{
rx = POLY3.caly(temperature) / 1000;
}
double v_rxr1 = VREF_R * R1 / (rx + R1);
long ret = (long)(para[0] + para[1] * v_rxr1);
return(ret);
}
/// <summary>
/// 根据拟合直线确定温度值，规定x轴为电压，y轴为AD输出
/// AD_output = para[0] + para[1] * voltage
/// </summary>
/// <param name="ad_output"></param>
/// <param name="para"></param>
/// <param name="METHOD"></param>
/// <param name="R1"></param>
/// <param name="R2"></param>
/// <param name="R3"></param>
/// <returns></returns>
public static double cal_by_pts(long ad_output, List <double> para, string METHOD = "poly3", double R1 = 10)
{
double vol = cal_vol_by_pts(ad_output, para);
double v_rxr1 = vol;
double rx = R1 * (VREF_R / v_rxr1 - 1);
double ret;
if (METHOD == "linear")
{
ret = LINEAR.calx(rx * 1000);
}
else
{
ret = POLY3.calx(rx * 1000);
}
return(ret);
}
/// <summary>
/// Better performance on a "Consolas" font.
/// Unit: kΩ
/// VREF_R
/// |
/// |-----
/// | |
/// RX R2 VREF_AD
/// |----+--->--(-) |
/// | | RW-->--ADC----(0~AD_MAX)
/// | |--->--(+) |
/// R1 R3 GND
/// |-----
/// GND
/// </summary>
/// <returns></returns>
public static double cal(long ad_output, double RW = 100, string METHOD = "poly3",
double R1 = 10, double R2 = 10, double R3 = 10)
{
if (RW <= 0 || ad_output == AD_MAX)
{
return(UNDEF);
}
double ad_input = ((double)ad_output / AD_MAX) * VREF_AD;
double v_r2r3 = VREF_R * R3 / (R2 + R3);
double v_rxr1 = v_r2r3 - ad_input / ((double)10 / 3 + 1 / RW * 200 / 3);
double rx = R1 * (VREF_R / v_rxr1 - 1);
double ret;
if (METHOD == "linear")
{
ret = LINEAR.calx(rx * 1000);
}
else
{
ret = POLY3.calx(rx * 1000);
}
return(ret);
}
