madmaurice/pcsensor-temper
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Fix formula for sht1x

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shakemid 2017-09-26 08:02:36 +09:00
parent c2188fc9cf
commit 9b7ded68ac
1 changed files with 6 additions and 2 deletions
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8
pcsensor.c
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@ -307,11 +307,13 @@ void decode_answer_fm75(unsigned char *answer, float *tempd, float *calibration)
// temp C internal
buf = ((signed char)answer[2] << 8) + (answer[3] & 0xFF);
if (debug) fprintf(stderr, "%d\n", buf);
tempd[0] = buf * (125.0 / 32000.0);
tempd[0] = tempd[0] * calibration[0] + calibration[1];
// temp C external
buf = ((signed char)answer[4] << 8) + (answer[5] & 0xFF);
if (debug) fprintf(stderr, "%d\n", buf);
tempd[1] = buf * (125.0 / 32000.0);
tempd[1] = tempd[1] * calibration[0] + calibration[1];
};
@ -320,12 +322,14 @@ void decode_answer_sht1x(unsigned char *answer, float *tempd, float *calibration
int buf;
// temp C
buf = ((signed char)answer[2] << 8) + (answer[3] && 0xFF);
buf = ((signed char)answer[2] << 8) + (answer[3] & 0xFF);
if (debug) fprintf(stderr, "%d\n", buf);
tempd[0] = -39.7 + 0.01 * buf;
tempd[0] = tempd[0] * calibration[0] + calibration[1];
// relative humidity
buf = ((signed char)answer[4] << 8) + (answer[5] && 0xFF);
buf = ((signed char)answer[4] << 8) + (answer[5] & 0xFF);
if (debug) fprintf(stderr, "%d\n", buf);
tempd[1] = -2.0468 + 0.0367 * buf - 1.5955e-6 * buf * buf;
tempd[1] = ( tempd[0] - 25 ) * ( 0.01 + 0.00008 * buf ) + tempd[1];
if (tempd[1] < 0) tempd[1] = 0;