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 1 3
Title "LTS Prototype"
Date "2018-02-06"
Rev "AA"
Comp "Let's Talk Science"
Comment1 "Shawn Nock <shawn@monadnock.ca>"
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
Text Notes 7700 1500 0    60   ~ 0
LED Array Face
Wire Wire Line
	9650 1700 10150 1700
Connection ~ 10050 1700
Connection ~ 9950 1700
Connection ~ 9850 1700
Connection ~ 9750 1700
$Comp
L GND #PWR01
U 1 1 5A7A186C
P 9900 1700
F 0 "#PWR01" H 9900 1450 50  0001 C CNN
F 1 "GND" H 9900 1550 50  0000 C CNN
F 2 "" H 9900 1700 50  0001 C CNN
F 3 "" H 9900 1700 50  0001 C CNN
	1    9900 1700
	1    0    0    -1  
$EndComp
Connection ~ 9900 1700
Wire Wire Line
	9550 1700 9550 2600
Wire Wire Line
	9450 1700 9450 2250
Wire Wire Line
	8850 1700 9350 1700
Connection ~ 9250 1700
Connection ~ 9150 1700
Connection ~ 9050 1700
Connection ~ 8950 1700
$Comp
L +3.3V #PWR02
U 1 1 5A7A1901
P 9100 1700
F 0 "#PWR02" H 9100 1550 50  0001 C CNN
F 1 "+3.3V" H 9100 1840 50  0000 C CNN
F 2 "" H 9100 1700 50  0001 C CNN
F 3 "" H 9100 1700 50  0001 C CNN
	1    9100 1700
	-1   0    0    1   
$EndComp
Connection ~ 9100 1700
NoConn ~ 10150 1200
NoConn ~ 9650 1200
NoConn ~ 9550 1200
NoConn ~ 9450 1200
NoConn ~ 9350 1200
NoConn ~ 8850 1200
NoConn ~ 8750 1200
NoConn ~ 8650 1200
NoConn ~ 8550 1200
NoConn ~ 8450 1200
NoConn ~ 7950 1200
NoConn ~ 7850 1200
NoConn ~ 7750 1200
NoConn ~ 7650 1200
NoConn ~ 7550 1200
NoConn ~ 7050 1200
NoConn ~ 6950 1200
NoConn ~ 6850 1200
NoConn ~ 6750 1200
NoConn ~ 6250 1200
Wire Wire Line
	8050 1700 8350 1700
Connection ~ 8250 1700
Connection ~ 8150 1700
Wire Wire Line
	8200 1200 8200 2000
Connection ~ 8200 1700
NoConn ~ 7850 1700
NoConn ~ 7750 1700
NoConn ~ 7650 1700
Wire Wire Line
	7550 1700 7550 2000
Wire Wire Line
	7150 1700 7450 1700
Connection ~ 7350 1700
Connection ~ 7250 1700
Wire Wire Line
	7300 1200 7300 2000
Connection ~ 7300 1700
NoConn ~ 7050 1700
NoConn ~ 6950 1700
NoConn ~ 6850 1700
NoConn ~ 6750 1700
Wire Wire Line
	6350 1700 6650 1700
Connection ~ 6550 1700
Connection ~ 6450 1700
NoConn ~ 6250 1700
Wire Wire Line
	6500 1200 6500 2000
Connection ~ 6500 1700
Text Label 6500 2000 1    60   ~ 0
P00
Text Label 7300 2000 1    60   ~ 0
P01
Text Label 7550 2000 1    60   ~ 0
P08
Text Label 8200 2000 1    60   ~ 0
P02
$Comp
L Conn_02x40_Row_Letter_First J101
U 1 1 5A7A1723
P 8150 1500
F 0 "J101" H 8200 3500 50  0000 C CNN
F 1 "Micro:bit Edge Connector" V 8200 1500 50  0000 C CNN
F 2 "" H 8150 1500 50  0001 C CNN
F 3 "" H 8150 1500 50  0001 C CNN
	1    8150 1500
	0    -1   -1   0   
$EndComp
Wire Wire Line
	9750 1200 10050 1200
Connection ~ 9950 1200
Connection ~ 9850 1200
Wire Wire Line
	8950 1200 9250 1200
Connection ~ 9150 1200
Connection ~ 9050 1200
Wire Wire Line
	7150 1200 7450 1200
Connection ~ 7350 1200
Connection ~ 7250 1200
Wire Wire Line
	6350 1200 6650 1200
Connection ~ 6550 1200
Connection ~ 6450 1200
Connection ~ 6500 1200
Connection ~ 7300 1200
Wire Wire Line
	9100 1700 9100 1200
Connection ~ 9100 1200
Wire Wire Line
	9900 1700 9900 1200
Connection ~ 9900 1200
Wire Wire Line
	8050 1200 8350 1200
Connection ~ 8150 1200
Connection ~ 8250 1200
Connection ~ 8200 1200
NoConn ~ 7950 1700
Text Label 8750 2000 1    60   ~ 0
P16
Text Label 8650 2000 1    60   ~ 0
P15
Text Label 8550 2000 1    60   ~ 0
P14
Text Label 8450 2000 1    60   ~ 0
P13
$Comp
L AP3012 U104
U 1 1 5A7BAC54
P 7650 5600
F 0 "U104" H 7850 5800 60  0000 C CNN
F 1 "AP3012" H 7650 5400 60  0000 C CNN
F 2 "" H 7550 5550 60  0001 C CNN
F 3 "" H 7550 5550 60  0001 C CNN
	1    7650 5600
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR03
U 1 1 5A7BAC55
P 7650 6100
F 0 "#PWR03" H 7650 5850 50  0001 C CNN
F 1 "GND" H 7650 5950 50  0000 C CNN
F 2 "" H 7650 6100 50  0001 C CNN
F 3 "" H 7650 6100 50  0001 C CNN
	1    7650 6100
	1    0    0    -1  
$EndComp
$Comp
L +3.3V #PWR04
U 1 1 5A7BAC56
P 8450 5200
F 0 "#PWR04" H 8450 5050 50  0001 C CNN
F 1 "+3.3V" H 8450 5340 50  0000 C CNN
F 2 "" H 8450 5200 50  0001 C CNN
F 3 "" H 8450 5200 50  0001 C CNN
	1    8450 5200
	1    0    0    -1  
$EndComp
$Comp
L L L101
U 1 1 5A7BAC57
P 7600 5250
F 0 "L101" V 7550 5250 50  0000 C CNN
F 1 "10uH" V 7675 5250 50  0000 C CNN
F 2 "" H 7600 5250 50  0001 C CNN
F 3 "" H 7600 5250 50  0001 C CNN
	1    7600 5250
	0    -1   -1   0   
$EndComp
$Comp
L C C107
U 1 1 5A7BAC58
P 8450 5900
F 0 "C107" H 8475 6000 50  0000 L CNN
F 1 "1uF" H 8475 5800 50  0000 L CNN
F 2 "" H 8488 5750 50  0001 C CNN
F 3 "" H 8450 5900 50  0001 C CNN
	1    8450 5900
	1    0    0    -1  
$EndComp
$Comp
L C C106
U 1 1 5A7BAC59
P 6550 5700
F 0 "C106" H 6575 5800 50  0000 L CNN
F 1 "1uF" H 6575 5600 50  0000 L CNN
F 2 "" H 6588 5550 50  0001 C CNN
F 3 "" H 6550 5700 50  0001 C CNN
	1    6550 5700
	1    0    0    -1  
$EndComp
$Comp
L R R106
U 1 1 5A7BAC5A
P 6900 5450
F 0 "R106" V 6980 5450 50  0000 C CNN
F 1 "30k" V 6900 5450 50  0000 C CNN
F 2 "" V 6830 5450 50  0001 C CNN
F 3 "" H 6900 5450 50  0001 C CNN
	1    6900 5450
	1    0    0    -1  
$EndComp
$Comp
L R R108
U 1 1 5A7BAC5B
P 6900 5900
F 0 "R108" V 6980 5900 50  0000 C CNN
F 1 "10k" V 6900 5900 50  0000 C CNN
F 2 "" V 6830 5900 50  0001 C CNN
F 3 "" H 6900 5900 50  0001 C CNN
	1    6900 5900
	1    0    0    -1  
$EndComp
$Comp
L +5V #PWR05
U 1 1 5A7BAC5C
P 6550 5250
F 0 "#PWR05" H 6550 5100 50  0001 C CNN
F 1 "+5V" H 6550 5390 50  0000 C CNN
F 2 "" H 6550 5250 50  0001 C CNN
F 3 "" H 6550 5250 50  0001 C CNN
	1    6550 5250
	1    0    0    -1  
$EndComp
$Comp
L D_Schottky D104
U 1 1 5A7BAC5D
P 7050 5250
F 0 "D104" H 7050 5350 50  0000 C CNN
F 1 "BAT60A" H 7050 5450 50  0000 C CNN
F 2 "" H 7050 5250 50  0001 C CNN
F 3 "" H 7050 5250 50  0001 C CNN
	1    7050 5250
	1    0    0    -1  
$EndComp
$Comp
L USB_B J104
U 1 1 5A7BAC5E
P 1000 3250
F 0 "J104" H 800 3700 50  0000 L CNN
F 1 "USB_B" H 800 3600 50  0000 L CNN
F 2 "" H 1150 3200 50  0001 C CNN
F 3 "" H 1150 3200 50  0001 C CNN
	1    1000 3250
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR06
U 1 1 5A7BAC5F
P 1000 3750
F 0 "#PWR06" H 1000 3500 50  0001 C CNN
F 1 "GND" H 1000 3600 50  0000 C CNN
F 2 "" H 1000 3750 50  0001 C CNN
F 3 "" H 1000 3750 50  0001 C CNN
	1    1000 3750
	1    0    0    -1  
$EndComp
$Comp
L TEST_1P J106
U 1 1 5A7BAC60
P 7250 3450
F 0 "J106" H 7250 3720 50  0000 C CNN
F 1 "3V3" H 7250 3650 50  0000 C CNN
F 2 "" H 7450 3450 50  0001 C CNN
F 3 "" H 7450 3450 50  0001 C CNN
	1    7250 3450
	1    0    0    -1  
$EndComp
$Comp
L TEST_1P J107
U 1 1 5A7BAC61
P 7500 3450
F 0 "J107" H 7500 3720 50  0000 C CNN
F 1 "BOOST" H 7500 3650 50  0000 C CNN
F 2 "" H 7700 3450 50  0001 C CNN
F 3 "" H 7700 3450 50  0001 C CNN
	1    7500 3450
	1    0    0    -1  
$EndComp
$Comp
L TEST_1P J108
U 1 1 5A7BAC62
P 7750 3450
F 0 "J108" H 7750 3720 50  0000 C CNN
F 1 "GND" H 7750 3650 50  0000 C CNN
F 2 "" H 7950 3450 50  0001 C CNN
F 3 "" H 7950 3450 50  0001 C CNN
	1    7750 3450
	1    0    0    -1  
$EndComp
$Comp
L +3.3V #PWR07
U 1 1 5A7BAC63
P 7250 3450
F 0 "#PWR07" H 7250 3300 50  0001 C CNN
F 1 "+3.3V" H 7250 3590 50  0000 C CNN
F 2 "" H 7250 3450 50  0001 C CNN
F 3 "" H 7250 3450 50  0001 C CNN
	1    7250 3450
	-1   0    0    1   
$EndComp
$Comp
L +5V #PWR08
U 1 1 5A7BAC64
P 7500 3450
F 0 "#PWR08" H 7500 3300 50  0001 C CNN
F 1 "+5V" H 7500 3590 50  0000 C CNN
F 2 "" H 7500 3450 50  0001 C CNN
F 3 "" H 7500 3450 50  0001 C CNN
	1    7500 3450
	-1   0    0    1   
$EndComp
$Comp
L GND #PWR09
U 1 1 5A7BAC65
P 7750 3450
F 0 "#PWR09" H 7750 3200 50  0001 C CNN
F 1 "GND" H 7750 3300 50  0000 C CNN
F 2 "" H 7750 3450 50  0001 C CNN
F 3 "" H 7750 3450 50  0001 C CNN
	1    7750 3450
	1    0    0    -1  
$EndComp
$Comp
L C C105
U 1 1 5A7BAC66
P 8900 3400
F 0 "C105" H 8925 3500 50  0000 L CNN
F 1 "10uF" H 8925 3300 50  0000 L CNN
F 2 "" H 8938 3250 50  0001 C CNN
F 3 "" H 8900 3400 50  0001 C CNN
	1    8900 3400
	1    0    0    -1  
$EndComp
$Comp
L +3.3V #PWR010
U 1 1 5A7BAC67
P 8900 3250
F 0 "#PWR010" H 8900 3100 50  0001 C CNN
F 1 "+3.3V" H 8900 3390 50  0000 C CNN
F 2 "" H 8900 3250 50  0001 C CNN
F 3 "" H 8900 3250 50  0001 C CNN
	1    8900 3250
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR011
U 1 1 5A7BAC68
P 8900 3550
F 0 "#PWR011" H 8900 3300 50  0001 C CNN
F 1 "GND" H 8900 3400 50  0000 C CNN
F 2 "" H 8900 3550 50  0001 C CNN
F 3 "" H 8900 3550 50  0001 C CNN
	1    8900 3550
	1    0    0    -1  
$EndComp
$Comp
L +3.3V #PWR012
U 1 1 5A7BAC69
P 2800 2000
F 0 "#PWR012" H 2800 1850 50  0001 C CNN
F 1 "+3.3V" H 2800 2140 50  0000 C CNN
F 2 "" H 2800 2000 50  0001 C CNN
F 3 "" H 2800 2000 50  0001 C CNN
	1    2800 2000
	1    0    0    -1  
$EndComp
$Comp
L ESDR0502N U103
U 1 1 5A7BAC6A
P 2200 3900
F 0 "U103" H 2500 4100 60  0000 C CNN
F 1 "ESDR0502N" H 2350 3700 60  0000 C CNN
F 2 "" H 2200 3900 60  0001 C CNN
F 3 "" H 2200 3900 60  0001 C CNN
	1    2200 3900
	1    0    0    -1  
$EndComp
Wire Wire Line
	7750 5250 9400 5250
Wire Wire Line
	7200 5250 7200 5500
Wire Wire Line
	7200 5250 7450 5250
Connection ~ 7200 5250
Wire Wire Line
	7200 5700 6900 5700
Wire Wire Line
	6900 5250 6550 5250
Wire Wire Line
	6550 5250 6550 5550
Wire Wire Line
	6550 5850 6550 6100
Wire Wire Line
	6550 6100 8450 6100
Connection ~ 6900 6100
Wire Wire Line
	8450 5200 8450 5750
Wire Wire Line
	8100 5500 8450 5500
Connection ~ 8450 5500
Connection ~ 8450 5250
Wire Wire Line
	6900 5600 6900 5750
Connection ~ 6900 5700
Wire Wire Line
	6900 5300 6900 5250
Wire Wire Line
	7200 5600 7100 5600
Wire Wire Line
	7100 5600 7100 6100
Connection ~ 7100 6100
Wire Wire Line
	1000 3650 1000 3750
Wire Wire Line
	900  3650 1000 3650
Wire Wire Line
	1300 3350 3200 3350
Wire Wire Line
	1300 3250 3200 3250
Wire Wire Line
	1300 3050 2500 3050
Wire Wire Line
	2500 3050 2500 2850
Wire Wire Line
	2500 2850 3200 2850
Wire Wire Line
	3050 2850 3050 2750
Wire Wire Line
	3050 2750 3200 2750
Connection ~ 3050 2850
Wire Wire Line
	2050 3550 2050 3050
Connection ~ 2050 3050
Wire Wire Line
	2150 3550 2150 3250
Connection ~ 2150 3250
Wire Wire Line
	2250 3550 2250 3350
Connection ~ 2250 3350
$Comp
L GND #PWR013
U 1 1 5A7BAC6B
P 1700 4100
F 0 "#PWR013" H 1700 3850 50  0001 C CNN
F 1 "GND" H 1700 3950 50  0000 C CNN
F 2 "" H 1700 4100 50  0001 C CNN
F 3 "" H 1700 4100 50  0001 C CNN
	1    1700 4100
	1    0    0    -1  
$EndComp
Connection ~ 1550 3050
Text Notes 8550 3800 0    30   ~ 0
Bulk Capacitance if Micro:bit powered
$Comp
L TEST_1P J105
U 1 1 5A7BAC6D
P 7000 3450
F 0 "J105" H 7000 3720 50  0000 C CNN
F 1 "5V" H 7000 3650 50  0000 C CNN
F 2 "" H 7200 3450 50  0001 C CNN
F 3 "" H 7200 3450 50  0001 C CNN
	1    7000 3450
	1    0    0    -1  
$EndComp
$Comp
L VBUS #PWR014
U 1 1 5A7BAC6E
P 7000 3450
F 0 "#PWR014" H 7000 3300 50  0001 C CNN
F 1 "VBUS" H 7000 3600 50  0000 C CNN
F 2 "" H 7000 3450 50  0001 C CNN
F 3 "" H 7000 3450 50  0001 C CNN
	1    7000 3450
	-1   0    0    1   
$EndComp
$Comp
L R R103
U 1 1 5A7BAC6F
P 3050 3050
F 0 "R103" V 3130 3050 50  0000 C CNN
F 1 "1k" V 3050 3050 50  0000 C CNN
F 2 "" V 2980 3050 50  0001 C CNN
F 3 "" H 3050 3050 50  0001 C CNN
	1    3050 3050
	0    1    1    0   
$EndComp
$Comp
L VBUS #PWR015
U 1 1 5A7BAC70
P 3800 1750
F 0 "#PWR015" H 3800 1600 50  0001 C CNN
F 1 "VBUS" H 3800 1900 50  0000 C CNN
F 2 "" H 3800 1750 50  0001 C CNN
F 3 "" H 3800 1750 50  0001 C CNN
	1    3800 1750
	1    0    0    -1  
$EndComp
$Comp
L C C101
U 1 1 5A7BAC71
P 3650 1950
F 0 "C101" H 3550 2050 50  0000 L CNN
F 1 "4.7uF" H 3400 1850 50  0000 L CNN
F 2 "" H 3688 1800 50  0001 C CNN
F 3 "" H 3650 1950 50  0001 C CNN
	1    3650 1950
	1    0    0    -1  
$EndComp
$Comp
L C C102
U 1 1 5A7BAC72
P 3950 1950
F 0 "C102" H 3975 2050 50  0000 L CNN
F 1 "0.1uF" H 3975 1850 50  0000 L CNN
F 2 "" H 3988 1800 50  0001 C CNN
F 3 "" H 3950 1950 50  0001 C CNN
	1    3950 1950
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR016
U 1 1 5A7BAC73
P 3800 2150
F 0 "#PWR016" H 3800 1900 50  0001 C CNN
F 1 "GND" H 3800 2000 50  0000 C CNN
F 2 "" H 3800 2150 50  0001 C CNN
F 3 "" H 3800 2150 50  0001 C CNN
	1    3800 2150
	1    0    0    -1  
$EndComp
Wire Wire Line
	3650 1800 3950 1800
Wire Wire Line
	3800 1800 3800 1750
Connection ~ 3800 1800
Wire Wire Line
	3800 2150 3800 2100
Wire Wire Line
	3650 2100 3950 2100
Connection ~ 3800 2100
$Comp
L C C103
U 1 1 5A7BAC74
P 4550 1950
F 0 "C103" H 4450 2050 50  0000 L CNN
F 1 "4.7uF" H 4300 1850 50  0000 L CNN
F 2 "" H 4588 1800 50  0001 C CNN
F 3 "" H 4550 1950 50  0001 C CNN
	1    4550 1950
	1    0    0    -1  
$EndComp
$Comp
L C C104
U 1 1 5A7BAC75
P 4850 1950
F 0 "C104" H 4875 2050 50  0000 L CNN
F 1 "0.1uF" H 4875 1850 50  0000 L CNN
F 2 "" H 4888 1800 50  0001 C CNN
F 3 "" H 4850 1950 50  0001 C CNN
	1    4850 1950
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR017
U 1 1 5A7BAC76
P 4700 2150
F 0 "#PWR017" H 4700 1900 50  0001 C CNN
F 1 "GND" H 4700 2000 50  0000 C CNN
F 2 "" H 4700 2150 50  0001 C CNN
F 3 "" H 4700 2150 50  0001 C CNN
	1    4700 2150
	1    0    0    -1  
$EndComp
Wire Wire Line
	4550 1800 4850 1800
Wire Wire Line
	4700 1800 4700 1750
Connection ~ 4700 1800
Wire Wire Line
	4700 2150 4700 2100
Wire Wire Line
	4550 2100 4850 2100
Connection ~ 4700 2100
$Comp
L +3.3V #PWR018
U 1 1 5A7BAC77
P 4700 1750
F 0 "#PWR018" H 4700 1600 50  0001 C CNN
F 1 "+3.3V" H 4700 1890 50  0000 C CNN
F 2 "" H 4700 1750 50  0001 C CNN
F 3 "" H 4700 1750 50  0001 C CNN
	1    4700 1750
	1    0    0    -1  
$EndComp
$Comp
L CP2102N U102
U 1 1 5A7BAC78
P 3950 3350
F 0 "U102" H 3950 4150 60  0000 C CNN
F 1 "CP2102N" H 4400 2500 60  0000 C CNN
F 2 "" H 3950 3350 60  0001 C CNN
F 3 "" H 3950 3350 60  0001 C CNN
	1    3950 3350
	1    0    0    -1  
$EndComp
Wire Wire Line
	8100 5700 9400 5700
Wire Wire Line
	6900 6100 6900 6050
Wire Wire Line
	8450 6100 8450 6050
Connection ~ 7650 6100
$Comp
L Q_NPN_BCE Q101
U 1 1 5A7BF0F3
P 9500 5950
F 0 "Q101" H 9700 6000 50  0000 L CNN
F 1 "Q_NPN_BCE" H 9700 5900 50  0000 L CNN
F 2 "" H 9700 6050 50  0001 C CNN
F 3 "" H 9500 5950 50  0001 C CNN
	1    9500 5950
	-1   0    0    -1  
$EndComp
$Comp
L R R107
U 1 1 5A7BF247
P 9400 5500
F 0 "R107" V 9480 5500 50  0000 C CNN
F 1 "10k" V 9400 5500 50  0000 C CNN
F 2 "" V 9330 5500 50  0001 C CNN
F 3 "" H 9400 5500 50  0001 C CNN
	1    9400 5500
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR019
U 1 1 5A7BF347
P 9400 6150
F 0 "#PWR019" H 9400 5900 50  0001 C CNN
F 1 "GND" H 9400 6000 50  0000 C CNN
F 2 "" H 9400 6150 50  0001 C CNN
F 3 "" H 9400 6150 50  0001 C CNN
	1    9400 6150
	1    0    0    -1  
$EndComp
Wire Wire Line
	9400 5250 9400 5350
Wire Wire Line
	9400 5650 9400 5750
Connection ~ 9400 5700
$Comp
L R R109
U 1 1 5A7BF753
P 9850 5950
F 0 "R109" V 9930 5950 50  0000 C CNN
F 1 "2k" V 9850 5950 50  0000 C CNN
F 2 "" V 9780 5950 50  0001 C CNN
F 3 "" H 9850 5950 50  0001 C CNN
	1    9850 5950
	0    1    1    0   
$EndComp
$Comp
L VBUS #PWR020
U 1 1 5A7BF7E2
P 10050 5950
F 0 "#PWR020" H 10050 5800 50  0001 C CNN
F 1 "VBUS" H 10050 6100 50  0000 C CNN
F 2 "" H 10050 5950 50  0001 C CNN
F 3 "" H 10050 5950 50  0001 C CNN
	1    10050 5950
	1    0    0    -1  
$EndComp
Wire Wire Line
	10000 5950 10050 5950
Wire Notes Line
	8800 5150 8800 6500
Wire Notes Line
	8800 6500 10250 6500
Wire Notes Line
	10250 6500 10250 5150
Wire Notes Line
	10250 5150 8800 5150
Text Notes 8900 6450 0    40   ~ 0
Disable boost supply on external power
Wire Notes Line
	6300 4900 8650 4900
Wire Notes Line
	8650 4900 8650 6350
Wire Notes Line
	8650 6350 6300 6350
Wire Notes Line
	6300 6350 6300 4900
Text Notes 6350 5000 0    40   ~ 0
Boost Supply. Sufficient for LCD w/o backlight and *perhaps* CO2 sensor
$Comp
L +5V #PWR021
U 1 1 5A7C3489
P 2300 2050
F 0 "#PWR021" H 2300 1900 50  0001 C CNN
F 1 "+5V" H 2300 2190 50  0000 C CNN
F 2 "" H 2300 2050 50  0001 C CNN
F 3 "" H 2300 2050 50  0001 C CNN
	1    2300 2050
	1    0    0    -1  
$EndComp
$Comp
L VBUS #PWR022
U 1 1 5A7C34EB
P 1550 2050
F 0 "#PWR022" H 1550 1900 50  0001 C CNN
F 1 "VBUS" H 1550 2200 50  0000 C CNN
F 2 "" H 1550 2050 50  0001 C CNN
F 3 "" H 1550 2050 50  0001 C CNN
	1    1550 2050
	1    0    0    -1  
$EndComp
Wire Wire Line
	8450 1700 8450 2000
Wire Wire Line
	8550 1700 8550 2000
Wire Wire Line
	8650 1700 8650 2000
Wire Wire Line
	8750 1700 8750 2000
$Sheet
S 1000 5400 950  900 
U 5A7C7D4B
F0 "LCD" 60
F1 "lcd.sch" 60
$EndSheet
$Comp
L MAX40200 U101
U 1 1 5A7CB4BE
P 1900 2300
F 0 "U101" H 2050 2100 30  0000 C CNN
F 1 "MAX40200" H 1900 2575 30  0000 C CNN
F 2 "" H 1900 2300 30  0001 C CNN
F 3 "" H 1900 2300 30  0001 C CNN
	1    1900 2300
	1    0    0    -1  
$EndComp
Wire Wire Line
	2200 2150 2300 2150
Wire Wire Line
	1550 2050 1550 3050
Wire Wire Line
	1550 2150 1600 2150
Wire Wire Line
	2300 2150 2300 2050
$Comp
L GND #PWR023
U 1 1 5A7CBBC1
P 1900 2650
F 0 "#PWR023" H 1900 2400 50  0001 C CNN
F 1 "GND" H 1900 2500 50  0000 C CNN
F 2 "" H 1900 2650 50  0001 C CNN
F 3 "" H 1900 2650 50  0001 C CNN
	1    1900 2650
	1    0    0    -1  
$EndComp
Wire Wire Line
	4750 2900 4950 2900
Wire Wire Line
	4750 3000 4950 3000
$Comp
L LED D103
U 1 1 5A7CDDD0
P 5550 3700
F 0 "D103" H 5550 3800 50  0000 C CNN
F 1 "DNP" H 5550 3600 50  0000 C CNN
F 2 "" H 5550 3700 50  0001 C CNN
F 3 "" H 5550 3700 50  0001 C CNN
	1    5550 3700
	0    -1   -1   0   
$EndComp
$Comp
L LED D102
U 1 1 5A7CDEAB
P 5250 3700
F 0 "D102" H 5250 3800 50  0000 C CNN
F 1 "DNP" H 5250 3600 50  0000 C CNN
F 2 "" H 5250 3700 50  0001 C CNN
F 3 "" H 5250 3700 50  0001 C CNN
	1    5250 3700
	0    -1   -1   0   
$EndComp
Wire Wire Line
	4750 3400 5550 3400
Wire Wire Line
	5550 3400 5550 3550
Wire Wire Line
	5250 3550 5250 3500
Wire Wire Line
	5250 3500 4750 3500
$Comp
L R R105
U 1 1 5A7CE2CD
P 5550 4100
F 0 "R105" V 5630 4100 50  0000 C CNN
F 1 "DNP" V 5550 4100 50  0000 C CNN
F 2 "" V 5480 4100 50  0001 C CNN
F 3 "" H 5550 4100 50  0001 C CNN
	1    5550 4100
	1    0    0    -1  
$EndComp
$Comp
L R R104
U 1 1 5A7CE36E
P 5250 4100
F 0 "R104" V 5330 4100 50  0000 C CNN
F 1 "DNP" V 5250 4100 50  0000 C CNN
F 2 "" V 5180 4100 50  0001 C CNN
F 3 "" H 5250 4100 50  0001 C CNN
	1    5250 4100
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR024
U 1 1 5A7CE3E2
P 5400 4350
F 0 "#PWR024" H 5400 4100 50  0001 C CNN
F 1 "GND" H 5400 4200 50  0000 C CNN
F 2 "" H 5400 4350 50  0001 C CNN
F 3 "" H 5400 4350 50  0001 C CNN
	1    5400 4350
	1    0    0    -1  
$EndComp
Wire Wire Line
	5250 3850 5250 3950
Wire Wire Line
	5550 3850 5550 3950
Wire Wire Line
	5250 4250 5550 4250
Wire Wire Line
	5400 4250 5400 4350
Connection ~ 5400 4250
NoConn ~ 4750 3200
NoConn ~ 4750 3300
NoConn ~ 4750 3750
NoConn ~ 4750 3850
NoConn ~ 4750 3950
NoConn ~ 4750 2650
NoConn ~ 4750 2750
Wire Wire Line
	3700 4350 3900 4350
Connection ~ 3800 4350
Wire Wire Line
	3800 4350 3800 4400
$Comp
L GND #PWR025
U 1 1 5A7CF61E
P 3800 4400
F 0 "#PWR025" H 3800 4150 50  0001 C CNN
F 1 "GND" H 3800 4250 50  0000 C CNN
F 2 "" H 3800 4400 50  0001 C CNN
F 3 "" H 3800 4400 50  0001 C CNN
	1    3800 4400
	1    0    0    -1  
$EndComp
$Comp
L D_Schottky D101
U 1 1 5A7CF6D6
P 2900 2400
F 0 "D101" H 2900 2500 50  0000 C CNN
F 1 "BAT60A" H 2900 2300 50  0000 C CNN
F 2 "" H 2900 2400 50  0001 C CNN
F 3 "" H 2900 2400 50  0001 C CNN
	1    2900 2400
	0    1    1    0   
$EndComp
Wire Wire Line
	2900 2550 2900 3050
Connection ~ 1550 2150
Wire Wire Line
	1600 2350 1550 2350
Connection ~ 1550 2350
Wire Wire Line
	3200 2650 2900 2650
Connection ~ 2900 2650
Wire Notes Line
	700  1400 700  4800
Wire Notes Line
	700  4800 5800 4800
Wire Notes Line
	5800 4800 5800 1400
Wire Notes Line
	5800 1400 700  1400
Text Notes 750  4750 0    60   ~ 0
USB Power and Data Collection UART
Text Notes 1900 4250 0    30   ~ 0
Surge / Transient Protection
Text Notes 1350 1850 0    30   Italic 0
Ideal diode to block to isolate VBUS\nfrom Boost Supply 5V
Wire Notes Line
	1300 1700 1300 2900
Wire Notes Line
	1300 2900 2550 2900
Wire Notes Line
	2550 2900 2550 1700
Wire Notes Line
	2550 1700 1300 1700
Wire Notes Line
	1550 3550 2700 3550
Wire Notes Line
	2700 3550 2700 4350
Wire Notes Line
	2700 4350 1550 4350
Wire Notes Line
	1550 4350 1550 3550
Text GLabel 8750 2000 3    45   Input ~ 0
COMPUTER_TXO
Text GLabel 8650 2000 3    45   Input ~ 0
COMPUTER_RXI
Text GLabel 4950 2900 2    45   Input ~ 0
COMPUTER_RXI
Text GLabel 4950 3000 2    45   Input ~ 0
COMPUTER_TXO
Text GLabel 9550 2600 3    45   Input ~ 0
SDA
Text GLabel 9450 2250 3    45   Input ~ 0
SCL
Text GLabel 8550 2000 3    45   Input ~ 0
nCCS811
Text Label 9450 2000 1    60   ~ 0
P19
Text Label 9550 2000 1    60   ~ 0
P20
$Sheet
S 2150 5400 950  900 
U 5A7DC600
F0 "Sensors" 60
F1 "sensors.sch" 60
$EndSheet
Text GLabel 8450 2000 3    45   Input ~ 0
CO2_SENSOR
$Comp
L R R101
U 1 1 5A7DFB2A
P 9950 2200
F 0 "R101" V 10030 2200 50  0000 C CNN
F 1 "4.7k" V 9950 2200 50  0000 C CNN
F 2 "" V 9880 2200 50  0001 C CNN
F 3 "" H 9950 2200 50  0001 C CNN
	1    9950 2200
	0    1    1    0   
$EndComp
$Comp
L R R102
U 1 1 5A7DFBF1
P 9950 2500
F 0 "R102" V 10030 2500 50  0000 C CNN
F 1 "4.7k" V 9950 2500 50  0000 C CNN
F 2 "" V 9880 2500 50  0001 C CNN
F 3 "" H 9950 2500 50  0001 C CNN
	1    9950 2500
	0    1    1    0   
$EndComp
Wire Wire Line
	10100 2200 10100 2500
$Comp
L +3.3V #PWR026
U 1 1 5A7DFD12
P 10300 2250
F 0 "#PWR026" H 10300 2100 50  0001 C CNN
F 1 "+3.3V" H 10300 2390 50  0000 C CNN
F 2 "" H 10300 2250 50  0001 C CNN
F 3 "" H 10300 2250 50  0001 C CNN
	1    10300 2250
	1    0    0    -1  
$EndComp
Wire Wire Line
	10100 2300 10300 2300
Wire Wire Line
	10300 2300 10300 2250
Connection ~ 10100 2300
Wire Wire Line
	9300 2500 9800 2500
Connection ~ 9550 2500
NoConn ~ 7550 2000
Text Notes 7200 3750 0    45   ~ 0
Test Points
$Comp
L TEST_1P J102
U 1 1 5A7E054A
P 9300 2200
F 0 "J102" H 9300 2470 50  0000 C CNN
F 1 "SCL" H 9300 2400 50  0000 C CNN
F 2 "" H 9500 2200 50  0001 C CNN
F 3 "" H 9500 2200 50  0001 C CNN
	1    9300 2200
	0    -1   -1   0   
$EndComp
$Comp
L TEST_1P J103
U 1 1 5A7E0709
P 9300 2500
F 0 "J103" H 9300 2770 50  0000 C CNN
F 1 "SDA" H 9300 2700 50  0000 C CNN
F 2 "" H 9500 2500 50  0001 C CNN
F 3 "" H 9500 2500 50  0001 C CNN
	1    9300 2500
	0    -1   -1   0   
$EndComp
Wire Wire Line
	9300 2200 9800 2200
Connection ~ 9450 2200
$Comp
L PWR_FLAG #FLG027
U 1 1 5A7EC327
P 2900 2000
F 0 "#FLG027" H 2900 2075 50  0001 C CNN
F 1 "PWR_FLAG" H 2900 2150 50  0000 C CNN
F 2 "" H 2900 2000 50  0001 C CNN
F 3 "" H 2900 2000 50  0001 C CNN
	1    2900 2000
	0    1    1    0   
$EndComp
Wire Wire Line
	2900 2250 2900 2000
Wire Wire Line
	2900 2000 2800 2000
$EndSCHEMATC