diff --git a/include/adc.h b/include/adc.h
index 622356a..756ae7f 100644
--- a/include/adc.h
+++ b/include/adc.h
@@ -40,7 +40,7 @@
 #include "esp_err.h"
 #include "pin_defs.h"
 
-#define ADC_ATTEN ADC_ATTEN_DB_11
+#define ADC_ATTEN ADC_ATTEN_DB_12
 
 
 /**