diff --git a/lorahandler.go b/lorahandler.go
index 266b3db..2635457 100644
--- a/lorahandler.go
+++ b/lorahandler.go
@@ -175,7 +175,18 @@ func DecodePayload(s string, deveui string, devaddr string, lrrlat float32, lrrl
 		if write2file {
 			// Time of first Packet
 			var tfp = (time.Now().Unix() / 60) - int64(pl_1.O)
-			var step = int64(pl_1.O / 7)
+			humidity_values := []uint8{pl_1.H1, pl_1.H2, pl_1.H3, pl_1.H4, pl_1.H5, pl_1.H6, pl_1.H7, pl_1.H8}
+			valid_measurements := 0
+			for _, v := range humidity_values {
+				if v > 0 {
+					valid_measurements = valid_measurements + 1
+				}
+			}
+			fmt.Printf("Valid Measurements: %d,\n", valid_measurements)
+			var step int64
+			if valid_measurements > 1 {
+				step = int64(int(pl_1.O) / (valid_measurements - 1))
+			}
 
 			// the first temperature is usually too high (maybe becaus of lorawan send, so we take
 			// the second measurement as first..., the same for humidity, which is usually too low...