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m10: rel.hum. approximate/experimental

pull/11/head
Zilog80 2019-04-06 00:07:50 +02:00
rodzic c1b18c2f80
commit 1a87be1a50
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80
m10/m10ptu.c
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@ -817,7 +817,9 @@ int checkM10(ui8_t *msg, int len) {
/* -------------------------------------------------------------------------- */
// Temperatur Sensor
// https://www.gruan.org/gruan/editor/documents/meetings/icm-6/pres/pres_306_Haeffelin.pdf
//
// Temperature Sensor
// NTC-Thermistor Shibaura PB5-41E
//
float get_Temp(int csOK) {
@ -966,33 +968,63 @@ float get_Tntc2(int csOK) {
#define LN2 0.693147181
#define ADR_108A 1000.0 // 0x3E8=1000
float get_count_55() { // CalRef 55%RH , T=20C ?
ui32_t TBCREF_1000 = frame_bytes[0x32] | (frame_bytes[0x33]<<8) | (frame_bytes[0x34]<<16);
return TBCREF_1000 / ADR_108A;
}
float get_count_RH() { // capture 1000 rising edges
ui32_t TBCCR1_1000 = frame_bytes[0x35] | (frame_bytes[0x36]<<8) | (frame_bytes[0x37]<<16);
return TBCCR1_1000 / ADR_108A;
}
float get_TLC555freq() {
return FREQ_CAPCLK / get_count_RH();
float get_TLC555freq(float count) {
return FREQ_CAPCLK / count;
}
/*
double get_C_RH() { // TLC555 astable: R_A=3.65k, R_B=338k
double R_B = 338e3;
double R_A = 3.65e3;
double C_RH = 1/get_TLC555freq() / (LN2 * (R_A + 2*R_B));
float get_C_RH(float freq, float T) { // TLC555 astable: R_A=3.65k, R_B=338k
float R_B = 338e3;
float R_A = 3.65e3;
float td = 1e-6;
float C_RH = (1/freq - 2*td) / (LN2 * (R_A + 2*R_B));
// freq/T compensation ...
return C_RH;
}
double get_RH(int csOK) {
float cRHc55_RH(float cRHc55) { // C_RH / C_55
// U.P.S.I.
// C_RH/C_55 = 0.8955 + 0.002*RH , T=20C
// C_RH = C_RH(RH,T) , RH = RH(C_RH,T)
// C_RH/C_55 approx.eq. count_RH/count_ref
// c55=270pF? diff=C_55-c55, T=20C
ui32_t c = frame_bytes[0x32] | (frame_bytes[0x33]<<8) | (frame_bytes[0x34]<<16); // CalRef 55%RH , T=20C ?
double count_ref = c / ADR_108A; // CalRef 55%RH , T=20C ?
double C_RH = get_C_RH();
double T = get_Tntc2(csOK);
return 0;
float TH = get_Tntc2(0);
float Tc = get_Temp(0);
float rh = (cRHc55-0.8955)/0.002; // UPSI linear transfer function
// temperature compensation
float T0 = 0.0, T1 = -30.0; // T/C
float T = Tc; // TH, TH-Tc (sensorT - T)
if (T < T0) rh += T0 - T/5.5; // approx/empirical
if (T < T1) rh *= 1.0 + (T1-T)/75.0; // approx/empirical
if (rh < 0.0) rh = 0.0;
if (rh > 100.0) rh = 100.0;
return rh;
}
*/
float get_RHc(int csOK) { // experimental/raw, errors~10%
float Tc = get_Temp(0);
float count_ref = get_count_55(); // CalRef 55%RH , T=20C ?
float count_RH = get_count_RH();
float C_55 = get_C_RH(get_TLC555freq(count_ref), 20.0); // CalRef 55%RH , T=20C ?
float C_RH = get_C_RH(get_TLC555freq(count_RH), Tc); // Tc == T_555 ?
float cRHc55 = C_RH / C_55;
return cRHc55_RH(cRHc55);
}
float get_RH(int csOK) { // experimental/raw, errors~10%
//ui32_t TBCREF_1000 = frame_bytes[0x32] | (frame_bytes[0x33]<<8) | (frame_bytes[0x34]<<16); // CalRef 55%RH , T=20C ?
//ui32_t TBCCR1_1000 = frame_bytes[0x35] | (frame_bytes[0x36]<<8) | (frame_bytes[0x37]<<16); // FrqCnt TLC555
//float cRHc55 = TBCCR1_1000 / (float)TBCREF_1000; // CalRef 55%RH , T=20C ?
float cRHc55 = get_count_RH() / get_count_55(); // CalRef 55%RH , T=20C ?
return cRHc55_RH(cRHc55);
}
/* -------------------------------------------------------------------------- */
int print_pos(int csOK) {
@ -1036,11 +1068,15 @@ int print_pos(int csOK) {
}
if (option_ptu) {
float t = get_Temp(csOK);
if (t > -270.0) fprintf(stdout, " T=%.1fC ", t);
float rh = get_RH(csOK);
fprintf(stdout, " ");
if (t > -270.0) fprintf(stdout, "T=%.1fC ", t);
if (option_verbose >= 3) { if (rh > -0.5) fprintf(stdout, "_RH=%.0f%% ", rh); }
if (option_verbose >= 3) {
float t2 = get_Tntc2(csOK);
float fq555 = get_TLC555freq();
float fq555 = get_TLC555freq(get_count_RH());
if (t2 > -270.0) fprintf(stdout, " (T2:%.1fC) (%.3fkHz) ", t2, fq555/1e3);
fprintf(stdout, "(cRH=%.1f%%) ", get_RHc(csOK));
}
}
fprintf(stdout, ANSI_COLOR_RESET"");
@ -1070,11 +1106,15 @@ int print_pos(int csOK) {
}
if (option_ptu) {
float t = get_Temp(csOK);
if (t > -270.0) fprintf(stdout, " T=%.1fC ", t);
float rh = get_RH(csOK);
fprintf(stdout, " ");
if (t > -270.0) fprintf(stdout, "T=%.1fC ", t);
if (option_verbose >= 3) { if (rh > -0.5) fprintf(stdout, "_RH=%.0f%% ", rh); }
if (option_verbose >= 3) {
float t2 = get_Tntc2(csOK);
float fq555 = get_TLC555freq();
float fq555 = get_TLC555freq(get_count_RH());
if (t2 > -270.0) fprintf(stdout, " (T2:%.1fC) (%.3fkHz) ", t2, fq555/1e3);
fprintf(stdout, "(cRH=%.1f%%) ", get_RHc(csOK));
}
}
}