diff --git a/doc/BH1750.pdf b/doc/BH1750.pdf
new file mode 100644
index 0000000..bc752b6
Binary files /dev/null and b/doc/BH1750.pdf differ
diff --git a/zh_bh1750.c b/zh_bh1750.c
index 28afeb1..7adf30e 100644
--- a/zh_bh1750.c
+++ b/zh_bh1750.c
@@ -142,7 +142,7 @@ READ:
     {
         printf("RAW data %ld\n", raw_data);
         printf("Sensivity %d\n", _sensivity);
-        if (raw_data == 65536 && _sensivity > 31)
+        if (raw_data == 65535 && _sensivity > 31)
         {
             if (zh_bh1750_adjust(_sensivity - 1) == ESP_OK)
             {
@@ -150,7 +150,7 @@ READ:
                 goto REPEATE;
             }
         }
-        if (raw_data == 0 && _sensivity < 254)
+        if (raw_data == 1 && _sensivity < 254)
         {
             if (zh_bh1750_adjust(_sensivity + 1) == ESP_OK)
             {