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Correction in resistor calculation

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This commit is contained in:
Wolfgang Hottgenroth
2016-09-06 11:51:20 +02:00
parent 94e25ea5fb
commit c2022fb8bb
1 changed files with 9 additions and 1 deletions
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10
src/measure.c
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@ -9,6 +9,7 @@
#include <stdint.h> #include <stdint.h>
#include <stdlib.h> #include <stdlib.h>
#include <stdbool.h> #include <stdbool.h>
#include <float.h>
#include "measure.h" #include "measure.h"
#include "PontCoopScheduler.h" #include "PontCoopScheduler.h"
@ -49,7 +50,14 @@ void measureCollectAndProcessConversion(void *handleArg) {
// process adcValue // process adcValue
// store result in variable temperature // store result in variable temperature
float r = ((((float)N_MAX) / ((float)n)) - 1.0) * R_REF; float r = 0.0;
if (n == 0) {
r = 0.0;
} else if (n == N_MAX) {
r = FLT_MAX;
} else {
r = R_REF / ((((float)N_MAX) / ((float)n)) - 1.0);
}
float t = (r / PT1000_R0 - 1) / PT1000_Coeff; float t = (r / PT1000_R0 - 1) / PT1000_Coeff;
uint8_t temperature = (uint8_t)t; uint8_t temperature = (uint8_t)t;