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
	9100 4050 9100 4150
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
	9900 4850 9800 4850
Wire Wire Line
	9800 5050 9900 5050
$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