Add another decoupling capacitator for the ATmega

weather_station_sensor-cache.lib

 DEF Own_Library_GY-B11_EP_280 U 0 20 Y Y 1 F N
 F0 "U" -250 450 50 H V C CNN
 F1 "Own_Library_GY-B11_EP_280" 200 450 50 H V C CNN
-F2 "" 1500 -450 50 H I C CNN
+F2 "Own_Library:GY-B11_EP_280_SMD" 1500 -450 50 H I C CNN
 F3 "" -100 -200 50 H I C CNN
 $FPLIST
  *LGA*2.5x2.5mm*P0.65mm*Clockwise*

weather_station_sensor.sch

 	1    0    0    -1  
 $EndComp
 Wire Wire Line
-	4550 1700 5450 1700
+	4550 1700 5000 1700
 $Comp
 L power:GND #PWR09
 U 1 1 5E88834B
 $EndComp
 Text Notes 1250 3050 0    50   ~ 0
 TODO: add some GPIOs that can be accessed via SMD pads
+$Comp
+L Device:C C4
+U 1 1 5E817D49
+P 5000 1950
+F 0 "C4" H 5115 1996 50  0000 L CNN
+F 1 "100n" H 5115 1905 50  0000 L CNN
+F 2 "Capacitors_SMD:C_0603_HandSoldering" H 5038 1800 50  0001 C CNN
+F 3 "~" H 5000 1950 50  0001 C CNN
+	1    5000 1950
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	5000 1800 5000 1700
+Connection ~ 5000 1700
+Wire Wire Line
+	5000 1700 5450 1700
+Wire Wire Line
+	5000 2100 4550 2100
+Connection ~ 4550 2100
 $EndSCHEMATC