diff --git a/src/measure.c b/src/measure.c
index 5a62d72..3427b6e 100644
--- a/src/measure.c
+++ b/src/measure.c
@@ -9,6 +9,7 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include <stdbool.h>
+#include <float.h>
 
 #include "measure.h"
 #include "PontCoopScheduler.h"
@@ -49,7 +50,14 @@ void measureCollectAndProcessConversion(void *handleArg) {
 
     // process adcValue
 	// 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;
 
 	uint8_t temperature = (uint8_t)t;