diff --git a/src/main.cpp b/src/main.cpp
index c2ad2a4..dda796b 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -887,9 +887,10 @@ void loop_TCS34725_lux()
   
   bool _changed=false;
   if (millis() >= (d.lastreadtime+d.readdelay)) {
-    if (millis() >= (lastread_tcs34725+d.readdelay)) {
+    if (millis() >= (lastread_tcs34725+d.readdelay)) { //avoid reading sensor twice in a short time
       //tcs.getRawData(&value_tcs_r, &value_tcs_g, &value_tcs_b, &value_tcs_c);
       tcs.getData();
+      lastread_tcs34725=millis();
       if (tcs.isSaturated){
         Serial.println("Warning: tcs34725 is saturated");
       }
@@ -926,9 +927,10 @@ void loop_TCS34725_colortemp()
   
   bool _changed=false;
   if (millis() >= (d.lastreadtime+d.readdelay)) {
-    if (millis() >= (lastread_tcs34725+d.readdelay)) {
+    if (millis() >= (lastread_tcs34725+d.readdelay)) { //avoid reading sensor twice in a short time
       //tcs.getRawData(&value_tcs_r, &value_tcs_g, &value_tcs_b, &value_tcs_c);
       tcs.getData();
+      lastread_tcs34725=millis();
       if (tcs.isSaturated){
         Serial.println("Warning: tcs34725 is saturated");
       }