EESchema Schematic File Version 2
LIBS:power
LIBS:device
LIBS:switches
LIBS:relays
LIBS:motors
LIBS:transistors
LIBS:conn
LIBS:linear
LIBS:regul
LIBS:74xx
LIBS:cmos4000
LIBS:adc-dac
LIBS:memory
LIBS:xilinx
LIBS:microcontrollers
LIBS:dsp
LIBS:microchip
LIBS:analog_switches
LIBS:motorola
LIBS:texas
LIBS:intel
LIBS:audio
LIBS:interface
LIBS:digital-audio
LIBS:philips
LIBS:display
LIBS:cypress
LIBS:siliconi
LIBS:opto
LIBS:atmel
LIBS:contrib
LIBS:valves
LIBS:lts
LIBS:lts-proto-cache
EELAYER 25 0
EELAYER END
$Descr USLetter 11000 8500
encoding utf-8
Sheet 3 3
Title "Sensors"
Date "2018-02-06"
Rev "AA"
Comp "Let's Talk Science"
Comment1 "Shawn Nock <shawn@monadnock.ca>"
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L Si7006-A20 U9
U 1 1 5A7DCB07
P 6900 4900
F 0 "U9" H 7050 4650 39  0000 C CNN
F 1 "Si7006-A20" V 6750 4800 39  0000 C CNN
F 2 "lts:DFN6_SiLabs_3x3_HandSoldering" H 6900 4900 39  0001 C CNN
F 3 "" H 6900 4900 39  0001 C CNN
	1    6900 4900
	1    0    0    -1  
$EndComp
Wire Wire Line
	7200 4850 7350 4850
Wire Wire Line
	7200 5000 7350 5000
$Comp
L GND #PWR044
U 1 1 5A7DCB08
P 6850 5400
F 0 "#PWR044" H 6850 5150 50  0001 C CNN
F 1 "GND" H 6850 5250 50  0000 C CNN
F 2 "" H 6850 5400 50  0001 C CNN
F 3 "" H 6850 5400 50  0001 C CNN
	1    6850 5400
	1    0    0    -1  
$EndComp
$Comp
L +3.3V #PWR045
U 1 1 5A7DCB09
P 6850 4450
F 0 "#PWR045" H 6850 4300 50  0001 C CNN
F 1 "+3.3V" H 6850 4590 50  0000 C CNN
F 2 "" H 6850 4450 50  0001 C CNN
F 3 "" H 6850 4450 50  0001 C CNN
	1    6850 4450
	1    0    0    -1  
$EndComp
Wire Wire Line
	6850 4450 6850 4600
$Comp
L C C14
U 1 1 5A7DCB0C
P 6400 4900
F 0 "C14" H 6425 5000 50  0000 L CNN
F 1 "0.1uF" H 6425 4800 50  0000 L CNN
F 2 "Capacitors_SMD:C_0603_HandSoldering" H 6438 4750 50  0001 C CNN
F 3 "" H 6400 4900 50  0001 C CNN
	1    6400 4900
	1    0    0    -1  
$EndComp
Text Notes 6250 4200 0    60   ~ 0
Temperature and Humidity
NoConn ~ 4650 4700
NoConn ~ 4650 4800
NoConn ~ 4650 5100
$Comp
L GND #PWR046
U 1 1 5A7DCB10
P 3550 5000
F 0 "#PWR046" H 3550 4750 50  0001 C CNN
F 1 "GND" H 3550 4850 50  0000 C CNN
F 2 "" H 3550 5000 50  0001 C CNN
F 3 "" H 3550 5000 50  0001 C CNN
	1    3550 5000
	0    1    1    0   
$EndComp
Wire Wire Line
	4650 5000 4800 5000
Wire Wire Line
	4650 4900 4800 4900
$Comp
L TEST_1P J20
U 1 1 5A7DCB12
P 4800 4900
F 0 "J20" V 4800 5100 50  0000 C CNN
F 1 "CO2_TX" V 4700 5050 50  0000 C CNN
F 2 "Measurement_Points:Measurement_Point_Round-SMD-Pad_Small" H 5000 4900 50  0001 C CNN
F 3 "" H 5000 4900 50  0001 C CNN
	1    4800 4900
	0    1    1    0   
$EndComp
$Comp
L TEST_1P J21
U 1 1 5A7DCB13
P 4800 5000
F 0 "J21" V 4800 5200 50  0000 C CNN
F 1 "CO2_RX" V 4900 5150 50  0000 C CNN
F 2 "Measurement_Points:Measurement_Point_Round-SMD-Pad_Small" H 5000 5000 50  0001 C CNN
F 3 "" H 5000 5000 50  0001 C CNN
	1    4800 5000
	0    1    1    0   
$EndComp
$Comp
L TEST_1P J22
U 1 1 5A7DCB14
P 4800 5400
F 0 "J22" V 4800 5600 50  0000 C CNN
F 1 "GND" V 4900 5500 50  0000 C CNN
F 2 "Measurement_Points:Measurement_Point_Square-SMD-Pad_Small" H 5000 5400 50  0001 C CNN
F 3 "" H 5000 5400 50  0001 C CNN
	1    4800 5400
	0    1    1    0   
$EndComp
$Comp
L GND #PWR047
U 1 1 5A7DCB15
P 4800 5400
F 0 "#PWR047" H 4800 5150 50  0001 C CNN
F 1 "GND" H 4800 5250 50  0000 C CNN
F 2 "" H 4800 5400 50  0001 C CNN
F 3 "" H 4800 5400 50  0001 C CNN
	1    4800 5400
	0    1    1    0   
$EndComp
Wire Notes Line
	5400 5700 5400 4150
$Comp
L MH-Z19 U7
U 1 1 5A7DCB16
P 4100 4900
F 0 "U7" H 4500 5250 60  0000 C CNN
F 1 "MH-Z19" H 4100 4650 60  0000 C CNN
F 2 "" H 4100 4950 60  0001 C CNN
F 3 "" H 4100 4950 60  0001 C CNN
	1    4100 4900
	1    0    0    -1  
$EndComp
$Comp
L C C12
U 1 1 5A7DCB19
P 3450 5250
F 0 "C12" H 3475 5350 50  0000 L CNN
F 1 "0.1uF" H 3475 5150 50  0000 L CNN
F 2 "Capacitors_SMD:C_0603_HandSoldering" H 3488 5100 50  0001 C CNN
F 3 "" H 3450 5250 50  0001 C CNN
	1    3450 5250
	1    0    0    -1  
$EndComp
Connection ~ 3450 5100
NoConn ~ 3550 4900
Wire Notes Line
	6200 5650 6200 4100
$Comp
L CCS811 U8
U 1 1 5A7DCB50
P 5750 2750
F 0 "U8" H 6050 3250 30  0000 C CNN
F 1 "CCS811" H 5700 2700 30  0000 C CNN
F 2 "Housings_LGA:AMS_LGA-10-1EP_2.7x4mm_Pitch0.6mm" H 5750 2750 30  0001 C CNN
F 3 "" H 5750 2750 30  0001 C CNN
	1    5750 2750
	1    0    0    -1  
$EndComp
Text GLabel 5300 2900 0    45   Input ~ 0
SCL
Text GLabel 5300 3000 0    45   Input ~ 0
SDA
NoConn ~ 5300 2550
Wire Wire Line
	5200 2450 5300 2450
Wire Wire Line
	5000 2100 6400 2100
Wire Wire Line
	5750 2100 5750 2000
$Comp
L +3.3V #PWR048
U 1 1 5A7DCB51
P 5750 2000
F 0 "#PWR048" H 5750 1850 50  0001 C CNN
F 1 "+3.3V" H 5750 2140 50  0000 C CNN
F 2 "" H 5750 2000 50  0001 C CNN
F 3 "" H 5750 2000 50  0001 C CNN
	1    5750 2000
	1    0    0    -1  
$EndComp
Wire Wire Line
	6200 2650 6200 2750
Wire Wire Line
	5750 3300 6400 3300
Wire Wire Line
	5800 3300 5800 3350
Connection ~ 5800 3300
$Comp
L GND #PWR049
U 1 1 5A7DCB52
P 5800 3350
F 0 "#PWR049" H 5800 3100 50  0001 C CNN
F 1 "GND" H 5800 3200 50  0000 C CNN
F 2 "" H 5800 3350 50  0001 C CNN
F 3 "" H 5800 3350 50  0001 C CNN
	1    5800 3350
	1    0    0    -1  
$EndComp
Wire Wire Line
	5200 2450 5200 2100
$Comp
L R R12
U 1 1 5A7DCB53
P 5000 2350
F 0 "R12" V 5080 2350 50  0000 C CNN
F 1 "10k" V 5000 2350 50  0000 C CNN
F 2 "Resistors_SMD:R_0603_HandSoldering" V 4930 2350 50  0001 C CNN
F 3 "" H 5000 2350 50  0001 C CNN
	1    5000 2350
	1    0    0    -1  
$EndComp
Wire Wire Line
	5000 2200 5000 2100
Connection ~ 5200 2100
Wire Wire Line
	4850 2650 5300 2650
Wire Wire Line
	5000 2650 5000 2500
Connection ~ 5000 2650
Text GLabel 4850 2650 0    45   Input ~ 0
nCCS811
Wire Notes Line
	4300 3550 6700 3550
Wire Notes Line
	4300 3550 4300 1600
Wire Notes Line
	4300 1600 6700 1600
Text Notes 4350 1700 0    60   ~ 0
VOC Sensor
Text Notes 2450 4250 0    60   ~ 0
CO2 Sensor (Infrared)
Connection ~ 3150 5100
Connection ~ 3300 5400
Wire Wire Line
	3300 5450 3300 5400
Wire Wire Line
	3150 5400 3450 5400
$Comp
L GND #PWR050
U 1 1 5A7DCB18
P 3300 5450
F 0 "#PWR050" H 3300 5200 50  0001 C CNN
F 1 "GND" H 3300 5300 50  0000 C CNN
F 2 "" H 3300 5450 50  0001 C CNN
F 3 "" H 3300 5450 50  0001 C CNN
	1    3300 5450
	1    0    0    -1  
$EndComp
$Comp
L CP C11
U 1 1 5A7DCB17
P 3150 5250
F 0 "C11" H 3175 5350 50  0000 L CNN
F 1 "CP" H 3175 5150 50  0000 L CNN
F 2 "Capacitors_SMD:CP_Elec_3x5.3" H 3188 5100 50  0001 C CNN
F 3 "" H 3150 5250 50  0001 C CNN
	1    3150 5250
	1    0    0    -1  
$EndComp
Wire Notes Line
	2400 5700 2400 4150
Wire Notes Line
	2400 5700 5400 5700
Wire Notes Line
	2400 4150 5400 4150
Wire Wire Line
	3050 5100 3550 5100
$Comp
L +5V #PWR051
U 1 1 5A7DCB0E
P 3050 5100
F 0 "#PWR051" H 3050 4950 50  0001 C CNN
F 1 "+5V" H 3050 5240 50  0000 C CNN
F 2 "" H 3050 5100 50  0001 C CNN
F 3 "" H 3050 5100 50  0001 C CNN
	1    3050 5100
	0    -1   -1   0   
$EndComp
Text GLabel 3350 4800 0    45   Input ~ 0
CO2_SENSOR
Text GLabel 7350 5000 2    45   Input ~ 0
SDA
Text GLabel 7350 4850 2    45   Input ~ 0
SCL
$Comp
L C C13
U 1 1 5A7E16B5
P 6400 2750
F 0 "C13" H 6425 2850 50  0000 L CNN
F 1 "4.7u" H 6425 2650 50  0000 L CNN
F 2 "Capacitors_SMD:C_0805_HandSoldering" H 6438 2600 50  0001 C CNN
F 3 "" H 6400 2750 50  0001 C CNN
	1    6400 2750
	1    0    0    -1  
$EndComp
Wire Wire Line
	6400 2100 6400 2600
Connection ~ 5750 2100
Wire Wire Line
	6400 3300 6400 2900
Connection ~ 5850 3300
Wire Notes Line
	6700 1600 6700 3550
Wire Wire Line
	6850 4550 6400 4550
Wire Wire Line
	6400 4550 6400 4750
Connection ~ 6850 4550
Wire Wire Line
	6850 5300 6850 5400
Wire Wire Line
	6850 5350 6400 5350
Wire Wire Line
	6400 5350 6400 5050
Connection ~ 6850 5350
Wire Notes Line
	6200 5650 7700 5650
Wire Notes Line
	7700 5650 7700 4100
Wire Notes Line
	7700 4100 6200 4100
Text Notes 7150 5650 0    45   ~ 0
I2C Addr.: 0x40
Text Notes 6150 3550 0    45   ~ 0
I2C Addr.: 0x5B
Text Notes 4400 1750 0    30   ~ 0
eCO2 (400-8192ppm)
Text Notes 2500 4350 0    30   ~ 0
CO2 (0-2000ppm; ±50ppm & 5%)
Text Notes 6350 4250 0    30   ~ 0
±1°C & 5% RH
Wire Wire Line
	3350 4800 3550 4800
$EndSCHEMATC