Added KiCad schematic + a pdf version of it

schematic/KiCad/ATMEGA328P_connectedMailBox/ATMEGA328P_connectedMailBox.kicad_pcb

@@ -0,0 +1 @@
+(kicad_pcb (version 4) (host kicad "dummy file") )

schematic/KiCad/ATMEGA328P_connectedMailBox/ATMEGA328P_connectedMailBox.pro

@@ -0,0 +1,43 @@
+update=02/10/2022 11:45:31
+version=1
+last_client=kicad
+[general]
+version=1
+RootSch=
+BoardNm=
+[pcbnew]
+version=1
+LastNetListRead=
+UseCmpFile=1
+PadDrill=0.600000000000
+PadDrillOvalY=0.600000000000
+PadSizeH=1.500000000000
+PadSizeV=1.500000000000
+PcbTextSizeV=1.500000000000
+PcbTextSizeH=1.500000000000
+PcbTextThickness=0.300000000000
+ModuleTextSizeV=1.000000000000
+ModuleTextSizeH=1.000000000000
+ModuleTextSizeThickness=0.150000000000
+SolderMaskClearance=0.000000000000
+SolderMaskMinWidth=0.000000000000
+DrawSegmentWidth=0.200000000000
+BoardOutlineThickness=0.100000000000
+ModuleOutlineThickness=0.150000000000
+[cvpcb]
+version=1
+NetIExt=net
+[eeschema]
+version=1
+LibDir=
+[eeschema/libraries]
+[schematic_editor]
+version=1
+PageLayoutDescrFile=
+PlotDirectoryName=../../
+SubpartIdSeparator=0
+SubpartFirstId=65
+NetFmtName=
+SpiceAjustPassiveValues=0
+LabSize=50
+ERC_TestSimilarLabels=1

schematic/KiCad/ATMEGA328P_connectedMailBox/ATMEGA328P_connectedMailBox.sch

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+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 1 1
+Title "ATMEGA328PU Connected Mailbox"
+Date "2022-10-01"
+Rev "1.0"
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+F 1 "3.9k" H 2130 6145 50  0000 R CNN
+F 2 "" V 2130 6100 50  0001 C CNN
+F 3 "~" H 2200 6100 50  0001 C CNN
+	1    2200 6100
+	-1   0    0    1   
+$EndComp
+NoConn ~ 2600 6950
+NoConn ~ 2600 6850
+Text GLabel 2100 6750 0    50   Input ~ 0
+SWITCH_V_SENSE_EN
+Text GLabel 2100 6650 0    50   Input ~ 0
+NRF_CE
+NoConn ~ 2600 6150
+NoConn ~ 2600 6350
+Text GLabel 2100 6450 0    50   Input ~ 0
+LDO_EN
+NoConn ~ 3500 6050
+Wire Wire Line
+	3850 5850 3500 5850
+$Comp
+L power:GND #PWR010
+U 1 1 63452AE8
+P 3850 5850
+F 0 "#PWR010" H 3850 5600 50  0001 C CNN
+F 1 "GND" H 3855 5677 50  0000 C CNN
+F 2 "" H 3850 5850 50  0001 C CNN
+F 3 "" H 3850 5850 50  0001 C CNN
+	1    3850 5850
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	3500 5750 3850 5750
+$Comp
+L power:VDD #PWR09
+U 1 1 6344BDD8
+P 3850 5750
+F 0 "#PWR09" H 3850 5600 50  0001 C CNN
+F 1 "VDD" H 3865 5923 50  0000 C CNN
+F 2 "" H 3850 5750 50  0001 C CNN
+F 3 "" H 3850 5750 50  0001 C CNN
+	1    3850 5750
+	1    0    0    -1  
+$EndComp
+NoConn ~ 3500 6350
+NoConn ~ 3500 6250
+NoConn ~ 3500 6150
+NoConn ~ 3500 5950
+NoConn ~ 3100 5400
+NoConn ~ 3000 5400
+NoConn ~ 2900 5400
+NoConn ~ 2800 5400
+NoConn ~ 2600 5950
+NoConn ~ 2600 5850
+NoConn ~ 2600 5750
+NoConn ~ 3200 7250
+NoConn ~ 3300 7250
+Wire Wire Line
+	3800 6950 3500 6950
+Text GLabel 3800 6950 2    50   Input ~ 0
+NRF_CS
+Wire Wire Line
+	3800 6750 3500 6750
+Text GLabel 3800 6850 2    50   Input ~ 0
+NRF_MOSI
+Wire Wire Line
+	3800 6850 3500 6850
+Text GLabel 3800 6750 2    50   Input ~ 0
+NRF_MISO
+Wire Wire Line
+	3500 6650 3800 6650
+Text GLabel 3800 6650 2    50   Input ~ 0
+NRF_SCK
+Wire Wire Line
+	3800 6450 3500 6450
+Text GLabel 3800 6450 2    50   Input ~ 0
+SWITCH_V_SENSE
+Wire Wire Line
+	3500 6550 3800 6550
+Text GLabel 3800 6550 2    50   Input ~ 0
+BAT_V_SENSE
+Text GLabel 2100 6550 0    50   Input ~ 0
+BAT_V_SENSE_EN
+Wire Wire Line
+	3250 5250 3250 5300
+Wire Wire Line
+	3450 5250 3250 5250
+$Comp
+L power:GND #PWR08
+U 1 1 634156BC
+P 3450 5250
+F 0 "#PWR08" H 3450 5000 50  0001 C CNN
+F 1 "GND" H 3455 5077 50  0000 C CNN
+F 2 "" H 3450 5250 50  0001 C CNN
+F 3 "" H 3450 5250 50  0001 C CNN
+	1    3450 5250
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	3300 5300 3300 5400
+Wire Wire Line
+	3200 5400 3200 5300
+$Comp
+L power:GND #PWR05
+U 1 1 633B7D64
+P 2950 4800
+F 0 "#PWR05" H 2950 4550 50  0001 C CNN
+F 1 "GND" H 2955 4627 50  0000 C CNN
+F 2 "" H 2950 4800 50  0001 C CNN
+F 3 "" H 2950 4800 50  0001 C CNN
+	1    2950 4800
+	1    0    0    -1  
+$EndComp
+$Comp
+L MCU_Module:ATMEGA328PU_PROMINI U1
+U 1 1 633887B2
+P 3050 6300
+F 0 "U1" H 3050 6300 50  0000 C CNN
+F 1 "ATMEGA328PU_PROMINI" H 2550 5350 50  0000 C CNN
+F 2 "" H 3100 6850 50  0001 C CNN
+F 3 "" H 3100 6850 50  0001 C CNN
+	1    3050 6300
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	8850 1000 8700 1000
+Wire Wire Line
+	8700 1000 8700 1050
+Wire Wire Line
+	8700 950  8700 1000
+Connection ~ 8700 1000
+Wire Wire Line
+	3200 5300 3250 5300
+Connection ~ 3250 5300
+Wire Wire Line
+	3250 5300 3300 5300
+Wire Notes Line
+	6450 2600 750  2600
+Wire Notes Line
+	6600 2600 10950 2600
+Wire Notes Line
+	10950 650  6600 650 
+Wire Notes Line
+	10950 650  10950 2600
+Wire Notes Line
+	6600 650  6600 2600
+Wire Notes Line
+	6450 650  6450 2600
+Wire Notes Line
+	750  650  6450 650 
+Wire Notes Line
+	750  650  750  2600
+Wire Notes Line
+	6600 2700 10950 2700
+Wire Notes Line
+	10950 5100 6600 5100
+Wire Notes Line
+	5850 5300 5850 6450
+Wire Notes Line
+	5850 6450 10950 6450
+Wire Notes Line
+	10950 6450 10950 5300
+Wire Notes Line
+	5850 5300 10950 5300
+Wire Notes Line
+	750  5200 4900 5200
+Wire Notes Line
+	4900 5200 4900 7700
+Wire Notes Line
+	4900 7700 750  7700
+Wire Notes Line
+	750  7700 750  5200
+Wire Notes Line
+	750  2700 6450 2700
+Wire Notes Line
+	6450 2700 6450 5100
+Wire Notes Line
+	6450 5100 750  5100
+Wire Notes Line
+	750  2700 750  5100
+Text Notes 800  750  0    50   ~ 0
+Main power part
+Text Notes 6650 750  0    50   ~ 0
+NRF transmitter part
+Text Notes 6650 2800 0    50   ~ 0
+Reed switch detection part
+Wire Notes Line
+	10950 2700 10950 5100
+Wire Notes Line
+	6600 2700 6600 5100
+Text Notes 800  2800 0    50   ~ 0
+Battery voltage sense part
+Text Notes 800  5300 0    50   ~ 0
+ATMEGA328P MCU part
+Text Notes 5900 5400 0    50   ~ 0
+Reed switch part
+Text Notes 6800 4450 0    50   ~ 0
+Letter event switch
+Text Notes 8200 4600 0    50   ~ 0
+Package event switch
+Text Notes 9350 4450 0    50   ~ 0
+Collected event switch
+$EndSCHEMATC