Initial commit. First design based on an attiny25 with a RTC

.gitignore

@@ -0,0 +1,27 @@
+# For PCBs designed using KiCad: http://www.kicad-pcb.org/
+# Format documentation: http://kicad-pcb.org/help/file-formats/
+
+# Temporary files
+*.000
+*.bak
+*.bck
+*.kicad_pcb-bak
+*.sch-bak
+*~
+_autosave-*
+*.tmp
+*-save.pro
+*-save.kicad_pcb
+fp-info-cache
+
+# Netlist files (exported from Eeschema)
+*.net
+
+# Autorouter files (exported from Pcbnew)
+*.dsn
+*.ses
+
+# Exported BOM files
+*.xml
+*.csv
+

weather_station_sensor-cache.lib

@@ -0,0 +1,328 @@
+EESchema-LIBRARY Version 2.4
+#encoding utf-8
+#
+# Device_Battery_Cell
+#
+DEF Device_Battery_Cell BT 0 0 N N 1 F N
+F0 "BT" 100 100 50 H V L CNN
+F1 "Device_Battery_Cell" 100 0 50 H V L CNN
+F2 "" 0 60 50 V I C CNN
+F3 "" 0 60 50 V I C CNN
+DRAW
+S -90 70 90 60 0 1 0 F
+S -62 47 58 27 0 1 0 F
+P 2 0 1 0 0 30 0 0 N
+P 2 0 1 0 0 70 0 100 N
+P 2 0 1 10 20 135 60 135 N
+P 2 0 1 10 40 155 40 115 N
+X + 1 0 200 100 D 50 50 1 1 P
+X - 2 0 -100 100 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_C
+#
+DEF Device_C C 0 10 N Y 1 F N
+F0 "C" 25 100 50 H V L CNN
+F1 "Device_C" 25 -100 50 H V L CNN
+F2 "" 38 -150 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ C_*
+$ENDFPLIST
+DRAW
+P 2 0 1 20 -80 -30 80 -30 N
+P 2 0 1 20 -80 30 80 30 N
+X ~ 1 0 150 110 D 50 50 1 1 P
+X ~ 2 0 -150 110 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_Crystal
+#
+DEF Device_Crystal Y 0 40 N N 1 F N
+F0 "Y" 0 150 50 H V C CNN
+F1 "Device_Crystal" 0 -150 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ Crystal*
+$ENDFPLIST
+DRAW
+S -45 100 45 -100 0 1 12 N
+P 2 0 1 0 -100 0 -75 0 N
+P 2 0 1 20 -75 -50 -75 50 N
+P 2 0 1 20 75 -50 75 50 N
+P 2 0 1 0 100 0 75 0 N
+X 1 1 -150 0 50 R 50 50 1 1 P
+X 2 2 150 0 50 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_D_Zener
+#
+DEF Device_D_Zener D 0 40 N N 1 F N
+F0 "D" 0 100 50 H V C CNN
+F1 "Device_D_Zener" 0 -100 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ TO-???*
+ *_Diode_*
+ *SingleDiode*
+ D_*
+$ENDFPLIST
+DRAW
+P 2 0 1 0 50 0 -50 0 N
+P 3 0 1 8 -50 -50 -50 50 -30 50 N
+P 4 0 1 8 50 -50 50 50 -50 0 50 -50 N
+X K 1 -150 0 100 R 50 50 1 1 P
+X A 2 150 0 100 L 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_Q_NMOS_GSD
+#
+DEF Device_Q_NMOS_GSD Q 0 0 Y N 1 F N
+F0 "Q" 200 50 50 H V L CNN
+F1 "Device_Q_NMOS_GSD" 200 -50 50 H V L CNN
+F2 "" 200 100 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+C 65 0 110 0 1 10 N
+C 100 -70 10 0 1 0 F
+C 100 70 10 0 1 0 F
+P 2 0 1 0 10 0 -100 0 N
+P 2 0 1 10 10 75 10 -75 N
+P 2 0 1 10 30 -50 30 -90 N
+P 2 0 1 10 30 20 30 -20 N
+P 2 0 1 10 30 90 30 50 N
+P 2 0 1 0 100 100 100 70 N
+P 3 0 1 0 100 -100 100 0 30 0 N
+P 4 0 1 0 30 -70 130 -70 130 70 30 70 N
+P 4 0 1 0 40 0 80 15 80 -15 40 0 F
+P 4 0 1 0 110 20 115 15 145 15 150 10 N
+P 4 0 1 0 130 15 115 -10 145 -10 130 15 N
+X G 1 -200 0 100 R 50 50 1 1 I
+X S 2 100 -200 100 U 50 50 1 1 P
+X D 3 100 200 100 D 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# Device_R
+#
+DEF Device_R R 0 0 N Y 1 F N
+F0 "R" 80 0 50 V V C CNN
+F1 "Device_R" 0 0 50 V V C CNN
+F2 "" -70 0 50 V I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ R_*
+$ENDFPLIST
+DRAW
+S -40 -100 40 100 0 1 10 N
+X ~ 1 0 150 50 D 50 50 1 1 P
+X ~ 2 0 -150 50 U 50 50 1 1 P
+ENDDRAW
+ENDDEF
+#
+# MCU_Microchip_ATtiny_ATtiny25-20SU
+#
+DEF MCU_Microchip_ATtiny_ATtiny25-20SU U 0 20 Y Y 1 F N
+F0 "U" -500 550 50 H V L BNN
+F1 "MCU_Microchip_ATtiny_ATtiny25-20SU" 100 -550 50 H V L TNN
+F2 "Package_SO:SOIJ-8_5.3x5.3mm_P1.27mm" 0 0 50 H I C CIN
+F3 "" 0 0 50 H I C CNN
+ALIAS ATtiny25-20SU ATtiny45V-10SU ATtiny45-20SU ATtiny85V-10SU ATtiny85-20SU
+$FPLIST
+ SOIJ*5.3x5.3mm*P1.27mm*
+$ENDFPLIST
+DRAW
+S -500 -500 500 500 0 1 10 f
+X ~RESET~/PB5 1 600 -200 100 L 50 50 1 1 B
+X XTAL1/PB3 2 600 0 100 L 50 50 1 1 B
+X XTAL2/PB4 3 600 -100 100 L 50 50 1 1 B
+X GND 4 0 -600 100 U 50 50 1 1 W
+X AREF/PB0 5 600 300 100 L 50 50 1 1 B
+X PB1 6 600 200 100 L 50 50 1 1 B
+X PB2 7 600 100 100 L 50 50 1 1 B
+X VCC 8 0 600 100 D 50 50 1 1 W
+ENDDRAW
+ENDDEF
+#
+# Power_Supervisor_TPS3839DBZ
+#
+DEF Power_Supervisor_TPS3839DBZ U 0 10 Y Y 1 F N
+F0 "U" 100 350 50 H V L CNN
+F1 "Power_Supervisor_TPS3839DBZ" 100 250 50 H V L CNN
+F2 "Package_TO_SOT_SMD:SOT-23" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ SOT?23*
+$ENDFPLIST
+DRAW
+S -100 200 300 -200 0 1 10 f
+X GND 1 0 -300 100 U 50 50 1 1 W
+X ~RESET 2 400 0 100 L 50 50 1 1 O
+X VDD 3 0 300 100 D 50 50 1 1 W
+ENDDRAW
+ENDDEF
+#
+# RF_NRF24L01_Breakout
+#
+DEF RF_NRF24L01_Breakout U 0 40 Y Y 1 F N
+F0 "U" -350 500 50 H V L CNN
+F1 "RF_NRF24L01_Breakout" 150 500 50 H V L CNN
+F2 "RF_Module:nRF24L01_Breakout" 150 600 50 H I L CIN
+F3 "" 0 -100 50 H I C CNN
+$FPLIST
+ nRF24L01*Breakout*
+$ENDFPLIST
+DRAW
+A 175 100 112 1166 -266 0 1 10 N 125 200 275 50
+A 175 101 49 900 -11 0 1 10 N 175 150 225 100
+A 175 101 78 1087 -191 0 1 10 N 150 175 250 75
+C 175 100 25 0 1 10 F
+S -350 450 350 -450 0 1 10 f
+P 2 0 1 10 175 75 175 -50 N
+X GND 1 0 -600 150 U 50 50 1 1 W
+X VCC 2 0 600 150 D 50 50 1 1 W
+X CE 3 -500 -200 150 R 50 50 1 1 I
+X ~CSN 4 -500 0 150 R 50 50 1 1 I
+X SCK 5 -500 100 150 R 50 50 1 1 I C
+X MOSI 6 -500 300 150 R 50 50 1 1 I
+X MISO 7 -500 200 150 R 50 50 1 1 O
+X IRQ 8 -500 -300 150 R 50 50 1 1 O
+ENDDRAW
+ENDDEF
+#
+# Regulator_Linear_LM317L_TO92
+#
+DEF Regulator_Linear_LM317L_TO92 U 0 10 Y Y 1 F N
+F0 "U" -150 125 50 H V C CNN
+F1 "Regulator_Linear_LM317L_TO92" 0 125 50 H V L CNN
+F2 "Package_TO_SOT_THT:TO-92_Inline" 0 225 50 H I C CIN
+F3 "" 0 0 50 H I C CNN
+$FPLIST
+ TO?92*
+$ENDFPLIST
+DRAW
+S -200 75 200 -200 0 1 10 f
+X ADJ 1 0 -300 100 U 50 50 1 1 I
+X VO 2 300 0 100 L 50 50 1 1 w
+X VI 3 -300 0 100 R 50 50 1 1 W
+ENDDRAW
+ENDDEF
+#
+# Regulator_Linear_MCP1700-3302E_SOT89
+#
+DEF Regulator_Linear_MCP1700-3302E_SOT89 U 0 10 Y Y 1 F N
+F0 "U" -150 125 50 H V C CNN
+F1 "Regulator_Linear_MCP1700-3302E_SOT89" 0 125 50 H V L CNN
+F2 "Package_TO_SOT_SMD:SOT-89-3" 0 200 50 H I C CNN
+F3 "" 0 -50 50 H I C CNN
+ALIAS MCP1703A-1202_SOT89 MCP1703A-1502_SOT89 MCP1703A-1802_SOT89 MCP1703A-2502_SOT89 MCP1703A-2802_SOT89 MCP1703A-3002_SOT89 MCP1703A-4002_SOT89 MCP1703A-5002_SOT89 MCP1700-3002E_SOT89 MCP1700-1202E_SOT89 MCP1700-1802E_SOT89 MCP1700-2502E_SOT89 MCP1700-2802E_SOT89 MCP1700-3302E_SOT89 MCP1700-5002E_SOT89 AP2127R-3.3
+$FPLIST
+ SOT?89*
+$ENDFPLIST
+DRAW
+S -200 -200 200 75 0 1 10 f
+X GND 1 0 -300 100 U 50 50 1 1 W
+X VI 2 -300 0 100 R 50 50 1 1 W
+X VO 3 300 0 100 L 50 50 1 1 w
+ENDDRAW
+ENDDEF
+#
+# Sensor_BME280
+#
+DEF Sensor_BME280 U 0 20 Y Y 1 F N
+F0 "U" -350 450 50 H V C CNN
+F1 "Sensor_BME280" 300 450 50 H V C CNN
+F2 "Package_LGA:Bosch_LGA-8_2.5x2.5mm_P0.65mm_ClockwisePinNumbering" 1500 -450 50 H I C CNN
+F3 "" 0 -200 50 H I C CNN
+$FPLIST
+ *LGA*2.5x2.5mm*P0.65mm*Clockwise*
+$ENDFPLIST
+DRAW
+S -400 400 400 -400 0 1 10 f
+X GND 1 -100 -600 200 U 50 50 1 1 W
+X CSB 2 600 -300 200 L 50 50 1 1 I
+X SDI 3 600 -100 200 L 50 50 1 1 B
+X SCK 4 600 100 200 L 50 50 1 1 I
+X SDO 5 600 300 200 L 50 50 1 1 B
+X VDDIO 6 -100 600 200 D 50 50 1 1 W
+X GND 7 100 -600 200 U 50 50 1 1 W
+X VDD 8 100 600 200 D 50 50 1 1 W
+ENDDRAW
+ENDDEF
+#
+# Timer_MCP7940N-xP
+#
+DEF Timer_MCP7940N-xP U 0 20 Y Y 1 F N
+F0 "U" -250 350 50 H V C CNN
+F1 "Timer_MCP7940N-xP" 450 350 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+ALIAS MCP7940N-xP MCP7940N-xSN MCP7940N-xST
+$FPLIST
+ SOIC*3.9x4.9mm*P1.27mm*
+ TSSOP*4.4x3mm*P0.65mm*
+ MSOP*3x3mm*P0.65mm*
+ DIP*W7.62mm*
+$ENDFPLIST
+DRAW
+S -300 300 300 -300 0 1 10 f
+X X1 1 400 100 100 L 50 50 1 1 I
+X X2 2 400 -100 100 L 50 50 1 1 O
+X VBAT 3 100 400 100 D 50 50 1 1 W
+X VSS 4 0 -400 100 U 50 50 1 1 W
+X SDA 5 -400 100 100 R 50 50 1 1 B
+X SCL 6 -400 200 100 R 50 50 1 1 I
+X MFP 7 -400 -100 100 R 50 50 1 1 C
+X VCC 8 0 400 100 D 50 50 1 1 W
+ENDDRAW
+ENDDEF
+#
+# power_+5V
+#
+DEF power_+5V #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -150 50 H I C CNN
+F1 "power_+5V" 0 140 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+P 2 0 1 0 -30 50 0 100 N
+P 2 0 1 0 0 0 0 100 N
+P 2 0 1 0 0 100 30 50 N
+X +5V 1 0 0 0 U 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+# power_GND
+#
+DEF power_GND #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -250 50 H I C CNN
+F1 "power_GND" 0 -150 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+P 6 0 1 0 0 0 0 -50 50 -50 0 -100 -50 -50 0 -50 N
+X GND 1 0 0 0 D 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+# power_VCC
+#
+DEF power_VCC #PWR 0 0 Y Y 1 F P
+F0 "#PWR" 0 -150 50 H I C CNN
+F1 "power_VCC" 0 150 50 H V C CNN
+F2 "" 0 0 50 H I C CNN
+F3 "" 0 0 50 H I C CNN
+DRAW
+C 0 75 25 0 1 0 N
+P 2 0 1 0 0 0 0 50 N
+X VCC 1 0 0 0 U 50 50 1 1 W N
+ENDDRAW
+ENDDEF
+#
+#End Library

weather_station_sensor.kicad_pcb

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

weather_station_sensor.pro

@@ -0,0 +1,33 @@
+update=22/05/2015 07:44:53
+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]

weather_station_sensor.sch

@@ -0,0 +1,871 @@
+EESchema Schematic File Version 4
+EELAYER 30 0
+EELAYER END
+$Descr A4 11693 8268
+encoding utf-8
+Sheet 1 1
+Title ""
+Date ""
+Rev ""
+Comp ""
+Comment1 ""
+Comment2 ""
+Comment3 ""
+Comment4 ""
+$EndDescr
+$Comp
+L RF:NRF24L01_Breakout U?
+U 1 1 5E580EDF
+P 9250 2700
+F 0 "U?" H 9630 2746 50  0000 L CNN
+F 1 "NRF24L01_Breakout" H 9630 2655 50  0000 L CNN
+F 2 "RF_Module:nRF24L01_Breakout" H 9400 3300 50  0001 L CIN
+F 3 "http://www.nordicsemi.com/eng/content/download/2730/34105/file/nRF24L01_Product_Specification_v2_0.pdf" H 9250 2600 50  0001 C CNN
+	1    9250 2700
+	1    0    0    -1  
+$EndComp
+$Comp
+L Sensor:BME280 U?
+U 1 1 5E581272
+P 9200 4750
+F 0 "U?" H 8770 4704 50  0000 R CNN
+F 1 "BME280" H 8770 4795 50  0000 R CNN
+F 2 "Package_LGA:Bosch_LGA-8_2.5x2.5mm_P0.65mm_ClockwisePinNumbering" H 10700 4300 50  0001 C CNN
+F 3 "https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BME280-DS002.pdf" H 9200 4550 50  0001 C CNN
+	1    9200 4750
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:GND #PWR?
+U 1 1 5E5840E4
+P 9100 5500
+F 0 "#PWR?" H 9100 5250 50  0001 C CNN
+F 1 "GND" H 9105 5327 50  0000 C CNN
+F 2 "" H 9100 5500 50  0001 C CNN
+F 3 "" H 9100 5500 50  0001 C CNN
+	1    9100 5500
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	9100 5350 9100 5400
+Wire Wire Line
+	9300 5350 9300 5400
+Wire Wire Line
+	9300 5400 9100 5400
+Connection ~ 9100 5400
+Wire Wire Line
+	9100 5400 9100 5500
+$Comp
+L Device:C C?
+U 1 1 5E5847B0
+P 8450 4200
+F 0 "C?" H 8565 4246 50  0000 L CNN
+F 1 "100 nF" H 8565 4155 50  0000 L CNN
+F 2 "" H 8488 4050 50  0001 C CNN
+F 3 "~" H 8450 4200 50  0001 C CNN
+	1    8450 4200
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
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+Wire Wire Line
+	9300 4150 9300 4050
+Wire Wire Line
+	9300 4050 9100 4050
+$Comp
+L power:GND #PWR?
+U 1 1 5E584F8B
+P 8450 4450
+F 0 "#PWR?" H 8450 4200 50  0001 C CNN
+F 1 "GND" H 8455 4277 50  0000 C CNN
+F 2 "" H 8450 4450 50  0001 C CNN
+F 3 "" H 8450 4450 50  0001 C CNN
+	1    8450 4450
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	8450 4450 8450 4350
+Wire Wire Line
+	9100 4050 8450 4050
+Connection ~ 9100 4050
+$Comp
+L power:VCC #PWR?
+U 1 1 5E587A3C
+P 9100 3950
+F 0 "#PWR?" H 9100 3800 50  0001 C CNN
+F 1 "VCC" H 9117 4123 50  0000 C CNN
+F 2 "" H 9100 3950 50  0001 C CNN
+F 3 "" H 9100 3950 50  0001 C CNN
+	1    9100 3950
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	9100 3950 9100 4050
+$Comp
+L Device:C C?
+U 1 1 5E588ABC
+P 9900 2200
+F 0 "C?" H 10015 2246 50  0000 L CNN
+F 1 "C" H 10015 2155 50  0000 L CNN
+F 2 "" H 9938 2050 50  0001 C CNN
+F 3 "~" H 9900 2200 50  0001 C CNN
+	1    9900 2200
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:GND #PWR?
+U 1 1 5E588AC2
+P 9900 2450
+F 0 "#PWR?" H 9900 2200 50  0001 C CNN
+F 1 "GND" H 9905 2277 50  0000 C CNN
+F 2 "" H 9900 2450 50  0001 C CNN
+F 3 "" H 9900 2450 50  0001 C CNN
+	1    9900 2450
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	9900 2450 9900 2350
+Wire Wire Line
+	9250 2050 9900 2050
+$Comp
+L power:VCC #PWR?
+U 1 1 5E58967F
+P 9250 1950
+F 0 "#PWR?" H 9250 1800 50  0001 C CNN
+F 1 "VCC" H 9267 2123 50  0000 C CNN
+F 2 "" H 9250 1950 50  0001 C CNN
+F 3 "" H 9250 1950 50  0001 C CNN
+	1    9250 1950
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	9250 1950 9250 2050
+Wire Wire Line
+	9250 2050 9250 2100
+Connection ~ 9250 2050
+Text GLabel 8650 2500 0    50   Input ~ 0
+MISO
+Text GLabel 8650 2600 0    50   Input ~ 0
+SCK
+Text GLabel 8650 2700 0    50   Input ~ 0
+NRF24_CS
+Wire Wire Line
+	8650 2400 8750 2400
+Wire Wire Line
+	8750 2500 8650 2500
+Wire Wire Line
+	8650 2600 8750 2600
+Wire Wire Line
+	8750 2700 8650 2700
+Wire Wire Line
+	9900 4450 9800 4450
+Wire Wire Line
+	9800 4650 9900 4650
+Wire Wire Line
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+Wire Wire Line
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+$Comp
+L MCU_Microchip_ATtiny:ATtiny25-20SU U?
+U 1 1 5E58DA03
+P 6350 2150
+F 0 "U?" H 5821 2196 50  0000 R CNN
+F 1 "ATtiny25-20SU" H 5821 2105 50  0000 R CNN
+F 2 "Package_SO:SOIJ-8_5.3x5.3mm_P1.27mm" H 6350 2150 50  0001 C CIN
+F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/atmel-2586-avr-8-bit-microcontroller-attiny25-attiny45-attiny85_datasheet.pdf" H 6350 2150 50  0001 C CNN
+	1    6350 2150
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:C C?
+U 1 1 5E58F8C5
+P 5350 1650
+F 0 "C?" H 5465 1696 50  0000 L CNN
+F 1 "100n" H 5465 1605 50  0000 L CNN
+F 2 "" H 5388 1500 50  0001 C CNN
+F 3 "~" H 5350 1650 50  0001 C CNN
+	1    5350 1650
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	5350 1500 6350 1500
+Wire Wire Line
+	6350 1500 6350 1550
+$Comp
+L power:VCC #PWR?
+U 1 1 5E590F43
+P 6350 1400
+F 0 "#PWR?" H 6350 1250 50  0001 C CNN
+F 1 "VCC" H 6367 1573 50  0000 C CNN
+F 2 "" H 6350 1400 50  0001 C CNN
+F 3 "" H 6350 1400 50  0001 C CNN
+	1    6350 1400
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	6350 1400 6350 1500
+Connection ~ 6350 1500
+$Comp
+L power:GND #PWR?
+U 1 1 5E5916A8
+P 5350 1850
+F 0 "#PWR?" H 5350 1600 50  0001 C CNN
+F 1 "GND" H 5355 1677 50  0000 C CNN
+F 2 "" H 5350 1850 50  0001 C CNN
+F 3 "" H 5350 1850 50  0001 C CNN
+	1    5350 1850
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:GND #PWR?
+U 1 1 5E5919B1
+P 6350 2800
+F 0 "#PWR?" H 6350 2550 50  0001 C CNN
+F 1 "GND" H 6355 2627 50  0000 C CNN
+F 2 "" H 6350 2800 50  0001 C CNN
+F 3 "" H 6350 2800 50  0001 C CNN
+	1    6350 2800
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	6350 2800 6350 2750
+Wire Wire Line
+	5350 1850 5350 1800
+$Comp
+L power:GND #PWR?
+U 1 1 5E595499
+P 9250 3400
+F 0 "#PWR?" H 9250 3150 50  0001 C CNN
+F 1 "GND" H 9255 3227 50  0000 C CNN
+F 2 "" H 9250 3400 50  0001 C CNN
+F 3 "" H 9250 3400 50  0001 C CNN
+	1    9250 3400
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	9250 3300 9250 3400
+Text GLabel 7050 1950 2    50   Input ~ 0
+MISO
+Wire Wire Line
+	7050 1950 6950 1950
+Text GLabel 7050 1850 2    50   Input ~ 0
+MOSI
+Wire Wire Line
+	7050 1850 6950 1850
+Text GLabel 7050 2050 2    50   Input ~ 0
+SCK
+Text GLabel 7050 2350 2    50   Input ~ 0
+NRF24_CS
+Wire Wire Line
+	7050 2350 6950 2350
+Text GLabel 7050 2250 2    50   Input ~ 0
+BME280_CS
+Wire Wire Line
+	7050 2250 6950 2250
+Wire Wire Line
+	7050 2050 6950 2050
+NoConn ~ 8750 3000
+Text GLabel 7050 2150 2    50   Input ~ 0
+CE
+Wire Wire Line
+	7050 2150 6950 2150
+Text GLabel 8650 2900 0    50   Input ~ 0
+CE
+Wire Wire Line
+	8650 2900 8750 2900
+$Comp
+L Device:C C?
+U 1 1 5E5A4C2E
+P 7900 4200
+F 0 "C?" H 8015 4246 50  0000 L CNN
+F 1 "100 nF" H 8015 4155 50  0000 L CNN
+F 2 "" H 7938 4050 50  0001 C CNN
+F 3 "~" H 7900 4200 50  0001 C CNN
+	1    7900 4200
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:GND #PWR?
+U 1 1 5E5A4C34
+P 7900 4450
+F 0 "#PWR?" H 7900 4200 50  0001 C CNN
+F 1 "GND" H 7905 4277 50  0000 C CNN
+F 2 "" H 7900 4450 50  0001 C CNN
+F 3 "" H 7900 4450 50  0001 C CNN
+	1    7900 4450
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	7900 4450 7900 4350
+Wire Wire Line
+	8450 4050 7900 4050
+Connection ~ 8450 4050
+Text GLabel 8650 2400 0    50   Input ~ 0
+MOSI
+Text GLabel 9900 4650 2    50   Input ~ 0
+SCK
+Text GLabel 9900 4450 2    50   Input ~ 0
+MISO
+Text GLabel 9900 4850 2    50   Input ~ 0
+MOSI
+Text GLabel 9900 5050 2    50   Input ~ 0
+BME280_CS
+Text Notes 4550 950  0    50   ~ 0
+TODO: add ISP connection
+$Comp
+L Power_Supervisor:TPS3839DBZ U?
+U 1 1 5E5B3B08
+P 2150 6800
+F 0 "U?" H 2020 6846 50  0000 R CNN
+F 1 "TPS3839L30DBZR" H 2020 6755 50  0000 R CNN
+F 2 "Package_TO_SOT_SMD:SOT-23" H 2150 6800 50  0001 C CNN
+F 3 "http://www.ti.com/lit/ds/sbvs193d/sbvs193d.pdf" H 2150 6800 50  0001 C CNN
+	1    2150 6800
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:D_Zener D?
+U 1 1 5E5B4A6A
+P 2750 7050
+F 0 "D?" V 2704 7129 50  0000 L CNN
+F 1 "ESD3Z12" V 2795 7129 50  0000 L CNN
+F 2 "" H 2750 7050 50  0001 C CNN
+F 3 "~" H 2750 7050 50  0001 C CNN
+	1    2750 7050
+	0    1    1    0   
+$EndComp
+Wire Wire Line
+	2950 6800 2750 6800
+Wire Wire Line
+	2750 6800 2750 6900
+Connection ~ 2750 6800
+Wire Wire Line
+	2750 6800 2550 6800
+$Comp
+L Device:Battery_Cell BT?
+U 1 1 5E5BF5B4
+P 700 6450
+F 0 "BT?" H 818 6546 50  0000 L CNN
+F 1 "AAA battery" H 818 6455 50  0000 L CNN
+F 2 "" V 700 6510 50  0001 C CNN
+F 3 "~" V 700 6510 50  0001 C CNN
+	1    700  6450
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:Battery_Cell BT?
+U 1 1 5E5C0221
+P 700 6850
+F 0 "BT?" H 818 6946 50  0000 L CNN
+F 1 "AAA battery" H 818 6855 50  0000 L CNN
+F 2 "" V 700 6910 50  0001 C CNN
+F 3 "~" V 700 6910 50  0001 C CNN
+	1    700  6850
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	700  6650 700  6550
+Wire Wire Line
+	700  6250 700  6150
+Wire Wire Line
+	700  6150 2150 6150
+Wire Wire Line
+	2150 6150 2150 6500
+Wire Wire Line
+	700  7450 2150 7450
+Wire Wire Line
+	2150 7450 2150 7100
+Wire Wire Line
+	2150 7450 2750 7450
+Wire Wire Line
+	2750 7450 2750 7200
+Connection ~ 2150 7450
+Wire Wire Line
+	2750 7450 3250 7450
+Wire Wire Line
+	3250 7450 3250 7000
+Connection ~ 2750 7450
+$Comp
+L Regulator_Linear:MCP1700-3302E_SOT89 U?
+U 1 1 5E5C950E
+P 4850 6150
+F 0 "U?" H 4850 6392 50  0000 C CNN
+F 1 "MCP1700-3302E_SOT89" H 4850 6301 50  0000 C CNN
+F 2 "Package_TO_SOT_SMD:SOT-89-3" H 4850 6350 50  0001 C CNN
+F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/20001826D.pdf" H 4850 6100 50  0001 C CNN
+	1    4850 6150
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	2150 6150 4300 6150
+Connection ~ 2150 6150
+$Comp
+L Device:C C?
+U 1 1 5E5CCED6
+P 4300 6400
+F 0 "C?" H 4415 6446 50  0000 L CNN
+F 1 "10uF" H 4415 6355 50  0000 L CNN
+F 2 "" H 4338 6250 50  0001 C CNN
+F 3 "~" H 4300 6400 50  0001 C CNN
+	1    4300 6400
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	4300 6250 4300 6150
+Connection ~ 4300 6150
+Wire Wire Line
+	4300 6150 4550 6150
+$Comp
+L Device:C C?
+U 1 1 5E5D6526
+P 5350 6400
+F 0 "C?" H 5465 6446 50  0000 L CNN
+F 1 "10uF" H 5465 6355 50  0000 L CNN
+F 2 "" H 5388 6250 50  0001 C CNN
+F 3 "~" H 5350 6400 50  0001 C CNN
+	1    5350 6400
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	5350 6250 5350 6150
+Wire Wire Line
+	5350 6150 5150 6150
+Wire Wire Line
+	3250 6600 3250 6500
+Wire Wire Line
+	3250 6500 4000 6500
+Wire Wire Line
+	4000 6500 4000 6650
+Wire Wire Line
+	4000 6650 4300 6650
+Wire Wire Line
+	5350 6650 5350 6550
+Wire Wire Line
+	4300 6550 4300 6650
+Connection ~ 4300 6650
+Wire Wire Line
+	4300 6650 5350 6650
+$Comp
+L power:VCC #PWR?
+U 1 1 5E5DC9B3
+P 5900 6150
+F 0 "#PWR?" H 5900 6000 50  0001 C CNN
+F 1 "VCC" H 5917 6323 50  0000 C CNN
+F 2 "" H 5900 6150 50  0001 C CNN
+F 3 "" H 5900 6150 50  0001 C CNN
+	1    5900 6150
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:GND #PWR?
+U 1 1 5E5DD008
+P 5900 6650
+F 0 "#PWR?" H 5900 6400 50  0001 C CNN
+F 1 "GND" H 5905 6477 50  0000 C CNN
+F 2 "" H 5900 6650 50  0001 C CNN
+F 3 "" H 5900 6650 50  0001 C CNN
+	1    5900 6650
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	5900 6650 5350 6650
+Connection ~ 5350 6650
+Wire Wire Line
+	5350 6150 5900 6150
+Connection ~ 5350 6150
+Wire Notes Line
+	550  6050 3900 6050
+Wire Notes Line
+	3900 6050 3900 7700
+Wire Notes Line
+	3900 7700 550  7700
+Wire Notes Line
+	550  7700 550  6050
+Text Notes 2900 7650 0    50   ~ 0
+disconnect battery when\nvoltage drops below 2V
+Wire Wire Line
+	700  6950 700  7450
+Text Notes 2150 6400 0    50   ~ 0
+TODO: different TPS3839
+$Comp
+L Device:Q_NMOS_GSD Q?
+U 1 1 5E5B7982
+P 3150 6800
+F 0 "Q?" H 3354 6846 50  0000 L CNN
+F 1 "BSS138" H 3354 6755 50  0000 L CNN
+F 2 "" H 3350 6900 50  0001 C CNN
+F 3 "~" H 3150 6800 50  0001 C CNN
+	1    3150 6800
+	1    0    0    -1  
+$EndComp
+Wire Notes Line
+	4100 5600 4100 7150
+Wire Notes Line
+	4100 7150 6050 7150
+Wire Notes Line
+	6050 7150 6050 5600
+Wire Notes Line
+	6050 5600 4100 5600
+Text Notes 4150 7050 0    50   ~ 0
+TODO: not needed if only two batteries are used
+Text Notes 800  4400 0    50   ~ 0
+Simulated power supply to get the minimum voltage\nof 2 V for testing on a breadboard:
+$Comp
+L Regulator_Linear:LM317L_TO92 U?
+U 1 1 5E750201
+P 1550 4750
+F 0 "U?" H 1550 4992 50  0000 C CNN
+F 1 "LM317T-DG" H 1550 4901 50  0000 C CNN
+F 2 "Package_TO_SOT_THT:TO-92_Inline" H 1550 4975 50  0001 C CIN
+F 3 "http://www.ti.com/lit/ds/snvs775k/snvs775k.pdf" H 1550 4750 50  0001 C CNN
+	1    1550 4750
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:+5V #PWR?
+U 1 1 5E751705
+P 850 4750
+F 0 "#PWR?" H 850 4600 50  0001 C CNN
+F 1 "+5V" H 865 4923 50  0000 C CNN
+F 2 "" H 850 4750 50  0001 C CNN
+F 3 "" H 850 4750 50  0001 C CNN
+	1    850  4750
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	850  4750 1250 4750
+$Comp
+L Device:R R?
+U 1 1 5E757434
+P 2050 4900
+F 0 "R?" H 2120 4946 50  0000 L CNN
+F 1 "240" H 2120 4855 50  0000 L CNN
+F 2 "" V 1980 4900 50  0001 C CNN
+F 3 "~" H 2050 4900 50  0001 C CNN
+	1    2050 4900
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	2050 5150 2050 5100
+Wire Wire Line
+	2050 5100 1550 5100
+Wire Wire Line
+	1550 5100 1550 5050
+Connection ~ 2050 5100
+Wire Wire Line
+	2050 5100 2050 5050
+Wire Wire Line
+	2050 4750 1850 4750
+$Comp
+L power:VCC #PWR?
+U 1 1 5E75FB56
+P 2250 4750
+F 0 "#PWR?" H 2250 4600 50  0001 C CNN
+F 1 "VCC" H 2267 4923 50  0000 C CNN
+F 2 "" H 2250 4750 50  0001 C CNN
+F 3 "" H 2250 4750 50  0001 C CNN
+	1    2250 4750
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	2250 4750 2050 4750
+Connection ~ 2050 4750
+$Comp
+L Device:R R?
+U 1 1 5E757A10
+P 2050 5300
+F 0 "R?" H 2120 5346 50  0000 L CNN
+F 1 "144" H 2120 5255 50  0000 L CNN
+F 2 "" V 1980 5300 50  0001 C CNN
+F 3 "~" H 2050 5300 50  0001 C CNN
+	1    2050 5300
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:GND #PWR?
+U 1 1 5E765082
+P 2050 5550
+F 0 "#PWR?" H 2050 5300 50  0001 C CNN
+F 1 "GND" H 2055 5377 50  0000 C CNN
+F 2 "" H 2050 5550 50  0001 C CNN
+F 3 "" H 2050 5550 50  0001 C CNN
+	1    2050 5550
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	2050 5450 2050 5550
+Wire Notes Line
+	650  4150 650  5900
+Wire Notes Line
+	650  5900 3350 5900
+Wire Notes Line
+	3350 5900 3350 4150
+Wire Notes Line
+	3350 4150 650  4150
+$Comp
+L Timer:MCP7940N-xP U?
+U 1 1 5E78DE5B
+P 2300 1900
+F 0 "U?" H 2300 1411 50  0000 C CNN
+F 1 "MCP7940M-IST" H 2300 1320 50  0000 C CNN
+F 2 "" H 2300 1900 50  0001 C CNN
+F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/20005010F.pdf" H 2300 1900 50  0001 C CNN
+	1    2300 1900
+	1    0    0    -1  
+$EndComp
+Text GLabel 5250 3000 0    50   Input ~ 0
+wake-up-interrupt
+Text GLabel 1300 2000 0    50   Input ~ 0
+wake-up-interrupt
+Wire Wire Line
+	1300 2000 1350 2000
+$Comp
+L Device:C C?
+U 1 1 5E79277C
+P 1900 1150
+F 0 "C?" H 2015 1196 50  0000 L CNN
+F 1 "100n" H 2015 1105 50  0000 L CNN
+F 2 "" H 1938 1000 50  0001 C CNN
+F 3 "~" H 1900 1150 50  0001 C CNN
+	1    1900 1150
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:GND #PWR?
+U 1 1 5E792783
+P 1900 1350
+F 0 "#PWR?" H 1900 1100 50  0001 C CNN
+F 1 "GND" H 1905 1177 50  0000 C CNN
+F 2 "" H 1900 1350 50  0001 C CNN
+F 3 "" H 1900 1350 50  0001 C CNN
+	1    1900 1350
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	1900 1350 1900 1300
+Wire Wire Line
+	2300 1500 2300 1000
+Wire Wire Line
+	2300 1000 1900 1000
+NoConn ~ 2400 1500
+Text GLabel 1800 1700 0    50   Input ~ 0
+SCL
+Text GLabel 1800 1800 0    50   Input ~ 0
+SDA
+Wire Wire Line
+	1800 1700 1900 1700
+Wire Wire Line
+	1900 1800 1800 1800
+$Comp
+L Device:Crystal Y?
+U 1 1 5E7A1D98
+P 2950 1900
+F 0 "Y?" V 2904 2031 50  0000 L CNN
+F 1 "32.768 kHz" V 2995 2031 50  0000 L CNN
+F 2 "" H 2950 1900 50  0001 C CNN
+F 3 "~" H 2950 1900 50  0001 C CNN
+	1    2950 1900
+	0    1    1    0   
+$EndComp
+$Comp
+L Device:C C?
+U 1 1 5E7A2611
+P 3150 2300
+F 0 "C?" V 2898 2300 50  0000 C CNN
+F 1 "C" V 2989 2300 50  0000 C CNN
+F 2 "" H 3188 2150 50  0001 C CNN
+F 3 "~" H 3150 2300 50  0001 C CNN
+	1    3150 2300
+	0    1    1    0   
+$EndComp
+$Comp
+L Device:C C?
+U 1 1 5E7A2B7C
+P 3150 1600
+F 0 "C?" V 2898 1600 50  0000 C CNN
+F 1 "C" V 2989 1600 50  0000 C CNN
+F 2 "" H 3188 1450 50  0001 C CNN
+F 3 "~" H 3150 1600 50  0001 C CNN
+	1    3150 1600
+	0    1    1    0   
+$EndComp
+Wire Wire Line
+	3000 1600 2950 1600
+Wire Wire Line
+	2950 1600 2950 1700
+Wire Wire Line
+	2950 2300 3000 2300
+Wire Wire Line
+	2950 2050 2950 2100
+Wire Wire Line
+	2950 2100 2800 2100
+Wire Wire Line
+	2800 2100 2800 2000
+Wire Wire Line
+	2800 2000 2700 2000
+Connection ~ 2950 2100
+Wire Wire Line
+	2950 2100 2950 2300
+Wire Wire Line
+	2700 1800 2800 1800
+Wire Wire Line
+	2800 1800 2800 1700
+Wire Wire Line
+	2800 1700 2950 1700
+Connection ~ 2950 1700
+Wire Wire Line
+	2950 1700 2950 1750
+$Comp
+L power:GND #PWR?
+U 1 1 5E7B6002
+P 3600 2350
+F 0 "#PWR?" H 3600 2100 50  0001 C CNN
+F 1 "GND" H 3605 2177 50  0000 C CNN
+F 2 "" H 3600 2350 50  0001 C CNN
+F 3 "" H 3600 2350 50  0001 C CNN
+	1    3600 2350
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	3600 2350 3600 2300
+Wire Wire Line
+	3600 2300 3300 2300
+Wire Wire Line
+	3600 2300 3600 1600
+Wire Wire Line
+	3600 1600 3300 1600
+Connection ~ 3600 2300
+Text GLabel 4000 1600 0    50   Input ~ 0
+SCL
+Text GLabel 4000 1700 0    50   Input ~ 0
+SDA
+$Comp
+L Device:R R?
+U 1 1 5E7DCEA4
+P 4100 1350
+F 0 "R?" H 4170 1396 50  0000 L CNN
+F 1 "2.2k" H 4170 1305 50  0000 L CNN
+F 2 "" V 4030 1350 50  0001 C CNN
+F 3 "~" H 4100 1350 50  0001 C CNN
+	1    4100 1350
+	1    0    0    -1  
+$EndComp
+Connection ~ 1350 2000
+Wire Wire Line
+	1350 2000 1900 2000
+$Comp
+L power:VCC #PWR?
+U 1 1 5E7E9D29
+P 1350 1600
+F 0 "#PWR?" H 1350 1450 50  0001 C CNN
+F 1 "VCC" H 1367 1773 50  0000 C CNN
+F 2 "" H 1350 1600 50  0001 C CNN
+F 3 "" H 1350 1600 50  0001 C CNN
+	1    1350 1600
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:VCC #PWR?
+U 1 1 5E7EE0C4
+P 2300 900
+F 0 "#PWR?" H 2300 750 50  0001 C CNN
+F 1 "VCC" H 2317 1073 50  0000 C CNN
+F 2 "" H 2300 900 50  0001 C CNN
+F 3 "" H 2300 900 50  0001 C CNN
+	1    2300 900 
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	2300 900  2300 1000
+Connection ~ 2300 1000
+Wire Wire Line
+	1350 1950 1350 2000
+Wire Wire Line
+	1350 1600 1350 1650
+$Comp
+L Device:R R?
+U 1 1 5E7E61B4
+P 1350 1800
+F 0 "R?" H 1420 1846 50  0000 L CNN
+F 1 "10k" H 1420 1755 50  0000 L CNN
+F 2 "" V 1280 1800 50  0001 C CNN
+F 3 "~" H 1350 1800 50  0001 C CNN
+	1    1350 1800
+	1    0    0    -1  
+$EndComp
+$Comp
+L Device:R R?
+U 1 1 5E7FF3CC
+P 4450 1350
+F 0 "R?" H 4520 1396 50  0000 L CNN
+F 1 "2.2k" H 4520 1305 50  0000 L CNN
+F 2 "" V 4380 1350 50  0001 C CNN
+F 3 "~" H 4450 1350 50  0001 C CNN
+	1    4450 1350
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	4000 1600 4100 1600
+Wire Wire Line
+	4100 1600 4100 1500
+Wire Wire Line
+	4100 1600 4900 1600
+Connection ~ 4100 1600
+Wire Wire Line
+	4450 1700 4450 1500
+Wire Wire Line
+	4000 1700 4450 1700
+$Comp
+L power:VCC #PWR?
+U 1 1 5E81A5BB
+P 4300 1100
+F 0 "#PWR?" H 4300 950 50  0001 C CNN
+F 1 "VCC" H 4317 1273 50  0000 C CNN
+F 2 "" H 4300 1100 50  0001 C CNN
+F 3 "" H 4300 1100 50  0001 C CNN
+	1    4300 1100
+	1    0    0    -1  
+$EndComp
+Wire Wire Line
+	4450 1200 4450 1150
+Wire Wire Line
+	4450 1150 4300 1150
+Wire Wire Line
+	4100 1150 4100 1200
+Wire Wire Line
+	4300 1100 4300 1150
+Connection ~ 4300 1150
+Wire Wire Line
+	4300 1150 4100 1150
+Wire Wire Line
+	4450 1700 4900 1700
+Connection ~ 4450 1700
+Wire Wire Line
+	1700 2300 2300 2300
+Wire Wire Line
+	1700 2350 1700 2300
+$Comp
+L power:GND #PWR?
+U 1 1 5E7CF38D
+P 1700 2350
+F 0 "#PWR?" H 1700 2100 50  0001 C CNN
+F 1 "GND" H 1705 2177 50  0000 C CNN
+F 2 "" H 1700 2350 50  0001 C CNN
+F 3 "" H 1700 2350 50  0001 C CNN
+	1    1700 2350
+	1    0    0    -1  
+$EndComp
+$Comp
+L power:GND #PWR?
+U 1 1 5E83B925
+P 4850 6450
+F 0 "#PWR?" H 4850 6200 50  0001 C CNN
+F 1 "GND" H 4855 6277 50  0000 C CNN
+F 2 "" H 4850 6450 50  0001 C CNN
+F 3 "" H 4850 6450 50  0001 C CNN
+	1    4850 6450
+	1    0    0    -1  
+$EndComp
+Text Notes 3300 3700 0    50   ~ 0
+further pins needed:\n- interrupt-pin for wake-up\n- SCL\n- SDA\n- \n\nThe SCL and SDA pins could be substituted by a SPI-to-I2C-converter, but then another CS-pin would be necessary.
+$EndSCHEMATC