microbit-classroom-sensor/lts-proto.sch

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
EELAYER 25 0
EELAYER END
$Descr USLetter 11000 8500
encoding utf-8
Sheet 1 2
Title "Power Supply"
Date "2018-02-06"
Rev "AA"
Comp "Let's Talk Science"
Comment1 "Shawn Nock <shawn@monadnock.ca>"
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
Text Notes 7500 1300 0    60   ~ 0
LED Array Face
Wire Wire Line
	9450 1500 9550 1500
Wire Wire Line
	9550 1500 9650 1500
Wire Wire Line
	9650 1500 9700 1500
Wire Wire Line
	9700 1500 9750 1500
Wire Wire Line
	9750 1500 9850 1500
Wire Wire Line
	9850 1500 9950 1500
Connection ~ 9850 1500
Connection ~ 9750 1500
Connection ~ 9650 1500
Connection ~ 9550 1500
$Comp
L GND #PWR?
U 1 1 5A7A186C
P 9700 1500
F 0 "#PWR?" H 9700 1250 50  0001 C CNN
F 1 "GND" H 9700 1350 50  0000 C CNN
F 2 "" H 9700 1500 50  0001 C CNN
F 3 "" H 9700 1500 50  0001 C CNN
	1    9700 1500
	1    0    0    -1  
$EndComp
Connection ~ 9700 1500
Wire Wire Line
	9350 1500 9350 1650
Wire Wire Line
	9250 1500 9250 1650
Text Label 9350 1650 3    60   ~ 0
SDA
Text Label 9250 1650 3    60   ~ 0
SCL
Wire Wire Line
	8650 1500 8750 1500
Wire Wire Line
	8750 1500 8850 1500
Wire Wire Line
	8850 1500 8900 1500
Wire Wire Line
	8900 1500 8950 1500
Wire Wire Line
	8950 1500 9050 1500
Wire Wire Line
	9050 1500 9150 1500
Connection ~ 9050 1500
Connection ~ 8950 1500
Connection ~ 8850 1500
Connection ~ 8750 1500
$Comp
L +3.3V #PWR?
U 1 1 5A7A1901
P 8900 1500
F 0 "#PWR?" H 8900 1350 50  0001 C CNN
F 1 "+3.3V" H 8900 1640 50  0000 C CNN
F 2 "" H 8900 1500 50  0001 C CNN
F 3 "" H 8900 1500 50  0001 C CNN
	1    8900 1500
	-1   0    0    1   
$EndComp
Connection ~ 8900 1500
NoConn ~ 9950 1000
NoConn ~ 9450 1000
NoConn ~ 9350 1000
NoConn ~ 9250 1000
NoConn ~ 9150 1000
NoConn ~ 8650 1000
NoConn ~ 8550 1000
NoConn ~ 8450 1000
NoConn ~ 8350 1000
NoConn ~ 8250 1000
NoConn ~ 7750 1000
NoConn ~ 7650 1000
NoConn ~ 7550 1000
NoConn ~ 7450 1000
NoConn ~ 7350 1000
NoConn ~ 6850 1000
NoConn ~ 6750 1000
NoConn ~ 6650 1000
NoConn ~ 6550 1000
NoConn ~ 6050 1000
Wire Wire Line
	8550 1500 8550 2750
Wire Wire Line
	7850 1500 7950 1500
Wire Wire Line
	7950 1500 8000 1500
Wire Wire Line
	8000 1500 8050 1500
Wire Wire Line
	8050 1500 8150 1500
Connection ~ 8050 1500
Connection ~ 7950 1500
Wire Wire Line
	8000 1000 8000 1500
Wire Wire Line
	8000 1500 8000 2000
Connection ~ 8000 1500
NoConn ~ 7650 1500
NoConn ~ 7550 1500
NoConn ~ 7450 1500
Wire Wire Line
	7350 1500 7350 2000
Wire Wire Line
	6950 1500 7050 1500
Wire Wire Line
	7050 1500 7100 1500
Wire Wire Line
	7100 1500 7150 1500
Wire Wire Line
	7150 1500 7250 1500
Connection ~ 7150 1500
Connection ~ 7050 1500
Wire Wire Line
	7100 1000 7100 1500
Wire Wire Line
	7100 1500 7100 1650
Connection ~ 7100 1500
NoConn ~ 6850 1500
NoConn ~ 6750 1500
NoConn ~ 6650 1500
NoConn ~ 6550 1500
Wire Wire Line
	6150 1500 6250 1500
Wire Wire Line
	6250 1500 6300 1500
Wire Wire Line
	6300 1500 6350 1500
Wire Wire Line
	6350 1500 6450 1500
Connection ~ 6350 1500
Connection ~ 6250 1500
NoConn ~ 6050 1500
Wire Wire Line
	6300 1000 6300 1500
Wire Wire Line
	6300 1500 6300 1650
Connection ~ 6300 1500
Text Label 6300 1650 3    60   ~ 0
P00
Text Label 7100 1650 3    60   ~ 0
P01
Text Label 7350 1650 3    60   ~ 0
P08
Text Label 8000 1650 3    60   ~ 0
P02
$Comp
L Conn_02x40_Row_Letter_First J?
U 1 1 5A7A1723
P 7950 1300
F 0 "J?" H 8000 3300 50  0000 C CNN
F 1 "Micro:bit Edge Connector" V 8000 1300 50  0000 C CNN
F 2 "" H 7950 1300 50  0001 C CNN
F 3 "" H 7950 1300 50  0001 C CNN
	1    7950 1300
	0    -1   -1   0   
$EndComp
Wire Wire Line
	9550 1000 9650 1000
Wire Wire Line
	9650 1000 9700 1000
Wire Wire Line
	9700 1000 9750 1000
Wire Wire Line
	9750 1000 9850 1000
Connection ~ 9750 1000
Connection ~ 9650 1000
Wire Wire Line
	8750 1000 8850 1000
Wire Wire Line
	8850 1000 8900 1000
Wire Wire Line
	8900 1000 8950 1000
Wire Wire Line
	8950 1000 9050 1000
Connection ~ 8950 1000
Connection ~ 8850 1000
Wire Wire Line
	6950 1000 7050 1000
Wire Wire Line
	7050 1000 7100 1000
Wire Wire Line
	7100 1000 7150 1000
Wire Wire Line
	7150 1000 7250 1000
Connection ~ 7150 1000
Connection ~ 7050 1000
Wire Wire Line
	6150 1000 6250 1000
Wire Wire Line
	6250 1000 6300 1000
Wire Wire Line
	6300 1000 6350 1000
Wire Wire Line
	6350 1000 6450 1000
Connection ~ 6350 1000
Connection ~ 6250 1000
Connection ~ 6300 1000
Connection ~ 7100 1000
Wire Wire Line
	8900 1500 8900 1000
Connection ~ 8900 1000
Wire Wire Line
	9700 1500 9700 1000
Connection ~ 9700 1000
Wire Wire Line
	7850 1000 7950 1000
Wire Wire Line
	7950 1000 8000 1000
Wire Wire Line
	8000 1000 8050 1000
Wire Wire Line
	8050 1000 8150 1000
Connection ~ 7950 1000
Connection ~ 8050 1000
Connection ~ 8000 1000
NoConn ~ 7750 1500
$Comp
L RC1602A U?
U 1 1 5A7B1A5A
P 8050 3150
F 0 "U?" H 7800 3800 50  0000 C CNN
F 1 "RC1602A" H 8160 3800 50  0000 L CNN
F 2 "Displays:RC1602A" H 8150 2350 50  0001 C CNN
F 3 "" H 8150 3050 50  0001 C CNN
	1    8050 3150
	0    -1   1    0   
$EndComp
Wire Wire Line
	8250 2750 8250 1500
Wire Wire Line
	8350 1500 8350 2750
Wire Wire Line
	8450 2750 8450 1500
Text Label 8550 1950 1    60   ~ 0
P16
Text Label 8450 1950 1    60   ~ 0
P15
Text Label 8350 1950 1    60   ~ 0
P14
Text Label 8250 1950 1    60   ~ 0
P13
NoConn ~ 8150 2750
NoConn ~ 8050 2750
NoConn ~ 7950 2750
NoConn ~ 7850 2750
Wire Wire Line
	8000 2000 7750 2000
Wire Wire Line
	7750 2000 7750 2750
Wire Wire Line
	7350 2000 7550 2000
Wire Wire Line
	7550 2000 7550 2750
$Comp
L GND #PWR?
U 1 1 5A7B1DB3
P 8750 3150
F 0 "#PWR?" H 8750 2900 50  0001 C CNN
F 1 "GND" H 8750 3000 50  0000 C CNN
F 2 "" H 8750 3150 50  0001 C CNN
F 3 "" H 8750 3150 50  0001 C CNN
	1    8750 3150
	1    0    0    -1  
$EndComp
$Comp
L +5V #PWR?
U 1 1 5A7B1DCB
P 7100 3150
F 0 "#PWR?" H 7100 3000 50  0001 C CNN
F 1 "+5V" H 7100 3290 50  0000 C CNN
F 2 "" H 7100 3150 50  0001 C CNN
F 3 "" H 7100 3150 50  0001 C CNN
	1    7100 3150
	0    -1   -1   0   
$EndComp
$Comp
L POT RV?
U 1 1 5A7B1DE3
P 7850 3700
F 0 "RV?" V 7675 3700 50  0000 C CNN
F 1 "10k" V 7750 3700 50  0000 C CNN
F 2 "" H 7850 3700 50  0001 C CNN
F 3 "" H 7850 3700 50  0001 C CNN
	1    7850 3700
	0    -1   -1   0   
$EndComp
$Comp
L GND #PWR?
U 1 1 5A7B2695
P 8250 3700
F 0 "#PWR?" H 8250 3450 50  0001 C CNN
F 1 "GND" H 8250 3550 50  0000 C CNN
F 2 "" H 8250 3700 50  0001 C CNN
F 3 "" H 8250 3700 50  0001 C CNN
	1    8250 3700
	1    0    0    -1  
$EndComp
Wire Wire Line
	7250 3150 7250 3700
Wire Wire Line
	7250 3700 7700 3700
Wire Wire Line
	7100 3150 7250 3150
Wire Wire Line
	7250 3150 7350 3150
Connection ~ 7250 3150
Wire Notes Line
	6750 2600 9000 2600
Wire Notes Line
	9000 2600 9000 4100
Wire Notes Line
	9000 4100 6750 4100
Wire Notes Line
	6750 4100 6750 2600
Text Notes 6750 4100 0    60   ~ 0
16x2 LCD Display
Wire Wire Line
	8000 3700 8250 3700
Wire Wire Line
	8250 3700 8250 3550
Wire Wire Line
	8350 3550 8350 3650
Wire Wire Line
	8350 3650 8500 3650
$Comp
L +5V_EXT #PWR?
U 1 1 5A7B2930
P 8500 3650
F 0 "#PWR?" H 8500 3500 50  0001 C CNN
F 1 "+5V_EXT" H 8500 3790 50  0000 C CNN
F 2 "" H 8500 3650 50  0001 C CNN
F 3 "" H 8500 3650 50  0001 C CNN
	1    8500 3650
	0    1    1    0   
$EndComp
Text Notes 7800 4100 0    39   ~ 0
Backlight only works on external power
$Comp
L Si7006-A20 U?
U 1 1 5A7B2B47
P 8850 5850
F 0 "U?" H 9000 5600 39  0000 C CNN
F 1 "Si7006-A20" V 8700 5750 39  0000 C CNN
F 2 "" H 8850 5850 39  0001 C CNN
F 3 "" H 8850 5850 39  0001 C CNN
	1    8850 5850
	1    0    0    -1  
$EndComp
Wire Wire Line
	9150 5800 9200 5800
Wire Wire Line
	9200 5800 9500 5800
Wire Wire Line
	9150 5950 9400 5950
Wire Wire Line
	9400 5950 9500 5950
Text Label 9500 5800 0    39   ~ 0
SCL
Text Label 9500 5950 0    39   ~ 0
SDA
$Comp
L GND #PWR?
U 1 1 5A7B2CB1
P 8800 6250
F 0 "#PWR?" H 8800 6000 50  0001 C CNN
F 1 "GND" H 8800 6100 50  0000 C CNN
F 2 "" H 8800 6250 50  0001 C CNN
F 3 "" H 8800 6250 50  0001 C CNN
	1    8800 6250
	1    0    0    -1  
$EndComp
$Comp
L +3.3V #PWR?
U 1 1 5A7B2CCD
P 8800 5400
F 0 "#PWR?" H 8800 5250 50  0001 C CNN
F 1 "+3.3V" H 8800 5540 50  0000 C CNN
F 2 "" H 8800 5400 50  0001 C CNN
F 3 "" H 8800 5400 50  0001 C CNN
	1    8800 5400
	1    0    0    -1  
$EndComp
Wire Wire Line
	8800 5550 8800 5400
$Comp
L R R?
U 1 1 5A7B2D39
P 9200 5550
F 0 "R?" V 9280 5550 50  0000 C CNN
F 1 "R" V 9200 5550 50  0000 C CNN
F 2 "" V 9130 5550 50  0001 C CNN
F 3 "" H 9200 5550 50  0001 C CNN
	1    9200 5550
	1    0    0    -1  
$EndComp
$Comp
L R R?
U 1 1 5A7B2D74
P 9400 5550
F 0 "R?" V 9480 5550 50  0000 C CNN
F 1 "R" V 9400 5550 50  0000 C CNN
F 2 "" V 9330 5550 50  0001 C CNN
F 3 "" H 9400 5550 50  0001 C CNN
	1    9400 5550
	1    0    0    -1  
$EndComp
Wire Wire Line
	8350 5400 8800 5400
Wire Wire Line
	8800 5400 9200 5400
Wire Wire Line
	9200 5400 9400 5400
Connection ~ 9200 5400
Wire Wire Line
	9200 5700 9200 5800
Connection ~ 9200 5800
Wire Wire Line
	9400 5700 9400 5950
Connection ~ 9400 5950
$Comp
L C C?
U 1 1 5A7B2FA7
P 8350 5550
F 0 "C?" H 8375 5650 50  0000 L CNN
F 1 "0.1uF" H 8375 5450 50  0000 L CNN
F 2 "" H 8388 5400 50  0001 C CNN
F 3 "" H 8350 5550 50  0001 C CNN
	1    8350 5550
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR?
U 1 1 5A7B2FF7
P 8350 5700
F 0 "#PWR?" H 8350 5450 50  0001 C CNN
F 1 "GND" H 8350 5550 50  0000 C CNN
F 2 "" H 8350 5700 50  0001 C CNN
F 3 "" H 8350 5700 50  0001 C CNN
	1    8350 5700
	1    0    0    -1  
$EndComp
Connection ~ 8800 5400
Text Notes 9100 5150 0    60   ~ 0
Temperature and Humidity
$Comp
L GND #PWR?
U 1 1 5A7B3244
P 7250 2700
F 0 "#PWR?" H 7250 2450 50  0001 C CNN
F 1 "GND" H 7250 2550 50  0000 C CNN
F 2 "" H 7250 2700 50  0001 C CNN
F 3 "" H 7250 2700 50  0001 C CNN
	1    7250 2700
	0    1    1    0   
$EndComp
Wire Wire Line
	7250 2700 7650 2700
Wire Wire Line
	7650 2700 7650 2750
NoConn ~ 7150 5600
NoConn ~ 7150 5700
NoConn ~ 7150 6000
$Comp
L +5V #PWR?
U 1 1 5A7B3AE8
P 5250 6100
F 0 "#PWR?" H 5250 5950 50  0001 C CNN
F 1 "+5V" H 5250 6240 50  0000 C CNN
F 2 "" H 5250 6100 50  0001 C CNN
F 3 "" H 5250 6100 50  0001 C CNN
	1    5250 6100
	-1   0    0    1   
$EndComp
$Comp
L +5V_EXT #PWR?
U 1 1 5A7B3B0E
P 5250 5900
F 0 "#PWR?" H 5250 5750 50  0001 C CNN
F 1 "+5V_EXT" H 5250 6040 50  0000 C CNN
F 2 "" H 5250 5900 50  0001 C CNN
F 3 "" H 5250 5900 50  0001 C CNN
	1    5250 5900
	1    0    0    -1  
$EndComp
Wire Wire Line
	5850 5700 5950 5700
Wire Wire Line
	5950 5700 6050 5700
Text Label 5850 5700 2    60   ~ 0
P01
$Comp
L GND #PWR?
U 1 1 5A7B3C3B
P 6050 5900
F 0 "#PWR?" H 6050 5650 50  0001 C CNN
F 1 "GND" H 6050 5750 50  0000 C CNN
F 2 "" H 6050 5900 50  0001 C CNN
F 3 "" H 6050 5900 50  0001 C CNN
	1    6050 5900
	0    1    1    0   
$EndComp
$Comp
L GS3 J?
U 1 1 5A7B3CFE
P 5400 6000
F 0 "J?" H 5450 6200 50  0000 C CNN
F 1 "GS3" H 5450 5801 50  0000 C CNN
F 2 "Connectors:GS3" V 5488 5926 50  0001 C CNN
F 3 "" H 5400 6000 50  0001 C CNN
	1    5400 6000
	1    0    0    -1  
$EndComp
Wire Wire Line
	5550 6000 5650 6000
Wire Wire Line
	5650 6000 5950 6000
Wire Wire Line
	5950 6000 6050 6000
Wire Notes Line
	4900 5050 7900 5050
Wire Notes Line
	4900 6600 7900 6600
Wire Notes Line
	4900 6600 4900 5050
Wire Wire Line
	7150 5900 7300 5900
Wire Wire Line
	7150 5800 7300 5800
$Comp
L TEST_1P J?
U 1 1 5A7B4048
P 7300 5800
F 0 "J?" V 7300 6000 50  0000 C CNN
F 1 "CO2_TX" V 7200 5950 50  0000 C CNN
F 2 "" H 7500 5800 50  0001 C CNN
F 3 "" H 7500 5800 50  0001 C CNN
	1    7300 5800
	0    1    1    0   
$EndComp
$Comp
L TEST_1P J?
U 1 1 5A7B40C9
P 7300 5900
F 0 "J?" V 7300 6100 50  0000 C CNN
F 1 "CO2_RX" V 7400 6050 50  0000 C CNN
F 2 "" H 7500 5900 50  0001 C CNN
F 3 "" H 7500 5900 50  0001 C CNN
	1    7300 5900
	0    1    1    0   
$EndComp
$Comp
L TEST_1P J?
U 1 1 5A7B42D5
P 7300 6300
F 0 "J?" V 7300 6500 50  0000 C CNN
F 1 "GND" V 7400 6400 50  0000 C CNN
F 2 "" H 7500 6300 50  0001 C CNN
F 3 "" H 7500 6300 50  0001 C CNN
	1    7300 6300
	0    1    1    0   
$EndComp
$Comp
L GND #PWR?
U 1 1 5A7B43C7
P 7300 6300
F 0 "#PWR?" H 7300 6050 50  0001 C CNN
F 1 "GND" H 7300 6150 50  0000 C CNN
F 2 "" H 7300 6300 50  0001 C CNN
F 3 "" H 7300 6300 50  0001 C CNN
	1    7300 6300
	0    1    1    0   
$EndComp
Wire Notes Line
	7900 6600 7900 5050
$Comp
L MH-Z19 U?
U 1 1 5A7B4633
P 6600 5800
F 0 "U?" H 7000 6150 60  0000 C CNN
F 1 "MH-Z19" H 6600 5550 60  0000 C CNN
F 2 "" H 6600 5850 60  0001 C CNN
F 3 "" H 6600 5850 60  0001 C CNN
	1    6600 5800
	1    0    0    -1  
$EndComp
$Comp
L CP C?
U 1 1 5A7B4759
P 5650 6150
F 0 "C?" H 5675 6250 50  0000 L CNN
F 1 "CP" H 5675 6050 50  0000 L CNN
F 2 "" H 5688 6000 50  0001 C CNN
F 3 "" H 5650 6150 50  0001 C CNN
	1    5650 6150
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR?
U 1 1 5A7B47AA
P 5800 6350
F 0 "#PWR?" H 5800 6100 50  0001 C CNN
F 1 "GND" H 5800 6200 50  0000 C CNN
F 2 "" H 5800 6350 50  0001 C CNN
F 3 "" H 5800 6350 50  0001 C CNN
	1    5800 6350
	1    0    0    -1  
$EndComp
$Comp
L C C?
U 1 1 5A7B47D8
P 5950 6150
F 0 "C?" H 5975 6250 50  0000 L CNN
F 1 "0.1uF" H 5975 6050 50  0000 L CNN
F 2 "" H 5988 6000 50  0001 C CNN
F 3 "" H 5950 6150 50  0001 C CNN
	1    5950 6150
	1    0    0    -1  
$EndComp
Wire Wire Line
	5650 6300 5800 6300
Wire Wire Line
	5800 6300 5950 6300
Wire Wire Line
	5800 6350 5800 6300
Connection ~ 5800 6300
Connection ~ 5650 6000
Connection ~ 5950 6000
NoConn ~ 6050 5800
Text Notes 4950 5150 0    60   ~ 0
CO2 Sensor
$Comp
L TEST_1P J?
U 1 1 5A7B4E16
P 5950 5700
F 0 "J?" H 5950 5970 50  0000 C CNN
F 1 "PWM" H 5950 5900 50  0000 C CNN
F 2 "" H 6150 5700 50  0001 C CNN
F 3 "" H 6150 5700 50  0001 C CNN
	1    5950 5700
	1    0    0    -1  
$EndComp
Connection ~ 5950 5700
$Comp
L AP3012 U?
U 1 1 5A7BAC54
P 2050 5600
F 0 "U?" H 2250 5800 60  0000 C CNN
F 1 "AP3012" H 2050 5400 60  0000 C CNN
F 2 "" H 1950 5550 60  0001 C CNN
F 3 "" H 1950 5550 60  0001 C CNN
	1    2050 5600
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR?
U 1 1 5A7BAC55
P 2050 6100
F 0 "#PWR?" H 2050 5850 50  0001 C CNN
F 1 "GND" H 2050 5950 50  0000 C CNN
F 2 "" H 2050 6100 50  0001 C CNN
F 3 "" H 2050 6100 50  0001 C CNN
	1    2050 6100
	1    0    0    -1  
$EndComp
$Comp
L +3.3V #PWR?
U 1 1 5A7BAC56
P 2850 5200
F 0 "#PWR?" H 2850 5050 50  0001 C CNN
F 1 "+3.3V" H 2850 5340 50  0000 C CNN
F 2 "" H 2850 5200 50  0001 C CNN
F 3 "" H 2850 5200 50  0001 C CNN
	1    2850 5200
	1    0    0    -1  
$EndComp
$Comp
L L L?
U 1 1 5A7BAC57
P 2000 5250
F 0 "L?" V 1950 5250 50  0000 C CNN
F 1 "10uH" V 2075 5250 50  0000 C CNN
F 2 "" H 2000 5250 50  0001 C CNN
F 3 "" H 2000 5250 50  0001 C CNN
	1    2000 5250
	0    -1   -1   0   
$EndComp
$Comp
L C C?
U 1 1 5A7BAC58
P 2850 5900
F 0 "C?" H 2875 6000 50  0000 L CNN
F 1 "1uF" H 2875 5800 50  0000 L CNN
F 2 "" H 2888 5750 50  0001 C CNN
F 3 "" H 2850 5900 50  0001 C CNN
	1    2850 5900
	1    0    0    -1  
$EndComp
$Comp
L C C?
U 1 1 5A7BAC59
P 950 5700
F 0 "C?" H 975 5800 50  0000 L CNN
F 1 "1uF" H 975 5600 50  0000 L CNN
F 2 "" H 988 5550 50  0001 C CNN
F 3 "" H 950 5700 50  0001 C CNN
	1    950  5700
	1    0    0    -1  
$EndComp
$Comp
L R R?
U 1 1 5A7BAC5A
P 1300 5450
F 0 "R?" V 1380 5450 50  0000 C CNN
F 1 "30k" V 1300 5450 50  0000 C CNN
F 2 "" V 1230 5450 50  0001 C CNN
F 3 "" H 1300 5450 50  0001 C CNN
	1    1300 5450
	1    0    0    -1  
$EndComp
$Comp
L R R?
U 1 1 5A7BAC5B
P 1300 5900
F 0 "R?" V 1380 5900 50  0000 C CNN
F 1 "10k" V 1300 5900 50  0000 C CNN
F 2 "" V 1230 5900 50  0001 C CNN
F 3 "" H 1300 5900 50  0001 C CNN
	1    1300 5900
	1    0    0    -1  
$EndComp
$Comp
L +5V #PWR?
U 1 1 5A7BAC5C
P 950 5250
F 0 "#PWR?" H 950 5100 50  0001 C CNN
F 1 "+5V" H 950 5390 50  0000 C CNN
F 2 "" H 950 5250 50  0001 C CNN
F 3 "" H 950 5250 50  0001 C CNN
	1    950  5250
	1    0    0    -1  
$EndComp
$Comp
L D_Schottky D?
U 1 1 5A7BAC5D
P 1450 5250
F 0 "D?" H 1450 5350 50  0000 C CNN
F 1 "1N5819" H 1450 5450 50  0000 C CNN
F 2 "" H 1450 5250 50  0001 C CNN
F 3 "" H 1450 5250 50  0001 C CNN
	1    1450 5250
	1    0    0    -1  
$EndComp
$Comp
L USB_B J?
U 1 1 5A7BAC5E
P 950 3350
F 0 "J?" H 750 3800 50  0000 L CNN
F 1 "USB_B" H 750 3700 50  0000 L CNN
F 2 "" H 1100 3300 50  0001 C CNN
F 3 "" H 1100 3300 50  0001 C CNN
	1    950  3350
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR?
U 1 1 5A7BAC5F
P 950 3850
F 0 "#PWR?" H 950 3600 50  0001 C CNN
F 1 "GND" H 950 3700 50  0000 C CNN
F 2 "" H 950 3850 50  0001 C CNN
F 3 "" H 950 3850 50  0001 C CNN
	1    950  3850
	1    0    0    -1  
$EndComp
$Comp
L TEST_1P J?
U 1 1 5A7BAC60
P 4450 7350
F 0 "J?" H 4450 7620 50  0000 C CNN
F 1 "3V3" H 4450 7550 50  0000 C CNN
F 2 "" H 4650 7350 50  0001 C CNN
F 3 "" H 4650 7350 50  0001 C CNN
	1    4450 7350
	1    0    0    -1  
$EndComp
$Comp
L TEST_1P J?
U 1 1 5A7BAC61
P 4700 7350
F 0 "J?" H 4700 7620 50  0000 C CNN
F 1 "BOOST" H 4700 7550 50  0000 C CNN
F 2 "" H 4900 7350 50  0001 C CNN
F 3 "" H 4900 7350 50  0001 C CNN
	1    4700 7350
	1    0    0    -1  
$EndComp
$Comp
L TEST_1P J?
U 1 1 5A7BAC62
P 4950 7350
F 0 "J?" H 4950 7620 50  0000 C CNN
F 1 "GND" H 4950 7550 50  0000 C CNN
F 2 "" H 5150 7350 50  0001 C CNN
F 3 "" H 5150 7350 50  0001 C CNN
	1    4950 7350
	1    0    0    -1  
$EndComp
$Comp
L +3.3V #PWR?
U 1 1 5A7BAC63
P 4450 7350
F 0 "#PWR?" H 4450 7200 50  0001 C CNN
F 1 "+3.3V" H 4450 7490 50  0000 C CNN
F 2 "" H 4450 7350 50  0001 C CNN
F 3 "" H 4450 7350 50  0001 C CNN
	1    4450 7350
	-1   0    0    1   
$EndComp
$Comp
L +5V #PWR?
U 1 1 5A7BAC64
P 4700 7350
F 0 "#PWR?" H 4700 7200 50  0001 C CNN
F 1 "+5V" H 4700 7490 50  0000 C CNN
F 2 "" H 4700 7350 50  0001 C CNN
F 3 "" H 4700 7350 50  0001 C CNN
	1    4700 7350
	-1   0    0    1   
$EndComp
$Comp
L GND #PWR?
U 1 1 5A7BAC65
P 4950 7350
F 0 "#PWR?" H 4950 7100 50  0001 C CNN
F 1 "GND" H 4950 7200 50  0000 C CNN
F 2 "" H 4950 7350 50  0001 C CNN
F 3 "" H 4950 7350 50  0001 C CNN
	1    4950 7350
	1    0    0    -1  
$EndComp
$Comp
L C C?
U 1 1 5A7BAC66
P 9800 2400
F 0 "C?" H 9825 2500 50  0000 L CNN
F 1 "10uF" H 9825 2300 50  0000 L CNN
F 2 "" H 9838 2250 50  0001 C CNN
F 3 "" H 9800 2400 50  0001 C CNN
	1    9800 2400
	1    0    0    -1  
$EndComp
$Comp
L +3.3V #PWR?
U 1 1 5A7BAC67
P 9800 2250
F 0 "#PWR?" H 9800 2100 50  0001 C CNN
F 1 "+3.3V" H 9800 2390 50  0000 C CNN
F 2 "" H 9800 2250 50  0001 C CNN
F 3 "" H 9800 2250 50  0001 C CNN
	1    9800 2250
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR?
U 1 1 5A7BAC68
P 9800 2550
F 0 "#PWR?" H 9800 2300 50  0001 C CNN
F 1 "GND" H 9800 2400 50  0000 C CNN
F 2 "" H 9800 2550 50  0001 C CNN
F 3 "" H 9800 2550 50  0001 C CNN
	1    9800 2550
	1    0    0    -1  
$EndComp
$Comp
L +3.3V #PWR?
U 1 1 5A7BAC69
P 2850 2500
F 0 "#PWR?" H 2850 2350 50  0001 C CNN
F 1 "+3.3V" H 2850 2640 50  0000 C CNN
F 2 "" H 2850 2500 50  0001 C CNN
F 3 "" H 2850 2500 50  0001 C CNN
	1    2850 2500
	1    0    0    -1  
$EndComp
$Comp
L ESDR0502N U?
U 1 1 5A7BAC6A
P 2150 4000
F 0 "U?" H 2450 4200 60  0000 C CNN
F 1 "ESDR0502N" H 2300 3800 60  0000 C CNN
F 2 "" H 2150 4000 60  0001 C CNN
F 3 "" H 2150 4000 60  0001 C CNN
	1    2150 4000
	1    0    0    -1  
$EndComp
Wire Wire Line
	2150 5250 2850 5250
Wire Wire Line
	2850 5250 3800 5250
Wire Wire Line
	1600 5250 1600 5500
Wire Wire Line
	1600 5250 1850 5250
Connection ~ 1600 5250
Wire Wire Line
	1600 5700 1300 5700
Wire Wire Line
	1300 5250 950  5250
Wire Wire Line
	950  5250 950  5550
Wire Wire Line
	950  5850 950  6100
Wire Wire Line
	950  6100 1300 6100
Wire Wire Line
	1300 6100 1500 6100
Wire Wire Line
	1500 6100 2050 6100
Wire Wire Line
	2050 6100 2850 6100
Connection ~ 1300 6100
Wire Wire Line
	2850 5200 2850 5250
Wire Wire Line
	2850 5250 2850 5500
Wire Wire Line
	2850 5500 2850 5750
Wire Wire Line
	2500 5500 2850 5500
Connection ~ 2850 5500
Connection ~ 2850 5250
Wire Wire Line
	1300 5600 1300 5700
Wire Wire Line
	1300 5700 1300 5750
Connection ~ 1300 5700
Wire Wire Line
	1300 5300 1300 5250
Wire Wire Line
	1600 5600 1500 5600
Wire Wire Line
	1500 5600 1500 6100
Connection ~ 1500 6100
Wire Wire Line
	950  3750 950  3850
Wire Wire Line
	850  3750 950  3750
Wire Wire Line
	1250 3450 2200 3450
Wire Wire Line
	2200 3450 3150 3450
Wire Wire Line
	1250 3350 2100 3350
Wire Wire Line
	2100 3350 3150 3350
Wire Wire Line
	1250 3150 1500 3150
Wire Wire Line
	1500 3150 2000 3150
Wire Wire Line
	2000 3150 2450 3150
Wire Wire Line
	2450 3150 2450 2950
Wire Wire Line
	2450 2950 3000 2950
Wire Wire Line
	3000 2950 3150 2950
Wire Wire Line
	3000 2950 3000 2850
Wire Wire Line
	3000 2850 3150 2850
Connection ~ 3000 2950
Wire Wire Line
	2000 3650 2000 3150
Connection ~ 2000 3150
Wire Wire Line
	2100 3650 2100 3350
Connection ~ 2100 3350
Wire Wire Line
	2200 3650 2200 3450
Connection ~ 2200 3450
$Comp
L GND #PWR?
U 1 1 5A7BAC6B
P 1650 4200
F 0 "#PWR?" H 1650 3950 50  0001 C CNN
F 1 "GND" H 1650 4050 50  0000 C CNN
F 2 "" H 1650 4200 50  0001 C CNN
F 3 "" H 1650 4200 50  0001 C CNN
	1    1650 4200
	1    0    0    -1  
$EndComp
$Comp
L VBUS #PWR?
U 1 1 5A7BAC6C
P 1500 3150
F 0 "#PWR?" H 1500 3000 50  0001 C CNN
F 1 "VBUS" H 1500 3300 50  0000 C CNN
F 2 "" H 1500 3150 50  0001 C CNN
F 3 "" H 1500 3150 50  0001 C CNN
	1    1500 3150
	1    0    0    -1  
$EndComp
Connection ~ 1500 3150
Text Notes 9500 2050 0    30   ~ 0
Bulk Capacitance if Micro:bit powered
$Comp
L TEST_1P J?
U 1 1 5A7BAC6D
P 4200 7350
F 0 "J?" H 4200 7620 50  0000 C CNN
F 1 "5V" H 4200 7550 50  0000 C CNN
F 2 "" H 4400 7350 50  0001 C CNN
F 3 "" H 4400 7350 50  0001 C CNN
	1    4200 7350
	1    0    0    -1  
$EndComp
$Comp
L VBUS #PWR?
U 1 1 5A7BAC6E
P 4200 7350
F 0 "#PWR?" H 4200 7200 50  0001 C CNN
F 1 "VBUS" H 4200 7500 50  0000 C CNN
F 2 "" H 4200 7350 50  0001 C CNN
F 3 "" H 4200 7350 50  0001 C CNN
	1    4200 7350
	-1   0    0    1   
$EndComp
$Comp
L R R?
U 1 1 5A7BAC6F
P 3000 3150
F 0 "R?" V 3080 3150 50  0000 C CNN
F 1 "1k" V 3000 3150 50  0000 C CNN
F 2 "" V 2930 3150 50  0001 C CNN
F 3 "" H 3000 3150 50  0001 C CNN
	1    3000 3150
	0    1    1    0   
$EndComp
Wire Wire Line
	2850 2500 2850 2750
Wire Wire Line
	2850 2750 2850 3150
Wire Wire Line
	2850 2750 3100 2750
Wire Wire Line
	3100 2750 3150 2750
$Comp
L VBUS #PWR?
U 1 1 5A7BAC70
P 1750 7050
F 0 "#PWR?" H 1750 6900 50  0001 C CNN
F 1 "VBUS" H 1750 7200 50  0000 C CNN
F 2 "" H 1750 7050 50  0001 C CNN
F 3 "" H 1750 7050 50  0001 C CNN
	1    1750 7050
	1    0    0    -1  
$EndComp
$Comp
L C C?
U 1 1 5A7BAC71
P 1600 7250
F 0 "C?" H 1500 7350 50  0000 L CNN
F 1 "4.7uF" H 1350 7150 50  0000 L CNN
F 2 "" H 1638 7100 50  0001 C CNN
F 3 "" H 1600 7250 50  0001 C CNN
	1    1600 7250
	1    0    0    -1  
$EndComp
$Comp
L C C?
U 1 1 5A7BAC72
P 1900 7250
F 0 "C?" H 1925 7350 50  0000 L CNN
F 1 "0.1uF" H 1925 7150 50  0000 L CNN
F 2 "" H 1938 7100 50  0001 C CNN
F 3 "" H 1900 7250 50  0001 C CNN
	1    1900 7250
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR?
U 1 1 5A7BAC73
P 1750 7450
F 0 "#PWR?" H 1750 7200 50  0001 C CNN
F 1 "GND" H 1750 7300 50  0000 C CNN
F 2 "" H 1750 7450 50  0001 C CNN
F 3 "" H 1750 7450 50  0001 C CNN
	1    1750 7450
	1    0    0    -1  
$EndComp
Wire Wire Line
	1600 7100 1750 7100
Wire Wire Line
	1750 7100 1900 7100
Wire Wire Line
	1750 7100 1750 7050
Connection ~ 1750 7100
Wire Wire Line
	1750 7450 1750 7400
Wire Wire Line
	1600 7400 1750 7400
Wire Wire Line
	1750 7400 1900 7400
Connection ~ 1750 7400
Connection ~ 3100 2750
Connection ~ 2850 2750
$Comp
L C C?
U 1 1 5A7BAC74
P 2500 7250
F 0 "C?" H 2400 7350 50  0000 L CNN
F 1 "4.7uF" H 2250 7150 50  0000 L CNN
F 2 "" H 2538 7100 50  0001 C CNN
F 3 "" H 2500 7250 50  0001 C CNN
	1    2500 7250
	1    0    0    -1  
$EndComp
$Comp
L C C?
U 1 1 5A7BAC75
P 2800 7250
F 0 "C?" H 2825 7350 50  0000 L CNN
F 1 "0.1uF" H 2825 7150 50  0000 L CNN
F 2 "" H 2838 7100 50  0001 C CNN
F 3 "" H 2800 7250 50  0001 C CNN
	1    2800 7250
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR?
U 1 1 5A7BAC76
P 2650 7450
F 0 "#PWR?" H 2650 7200 50  0001 C CNN
F 1 "GND" H 2650 7300 50  0000 C CNN
F 2 "" H 2650 7450 50  0001 C CNN
F 3 "" H 2650 7450 50  0001 C CNN
	1    2650 7450
	1    0    0    -1  
$EndComp
Wire Wire Line
	2500 7100 2650 7100
Wire Wire Line
	2650 7100 2800 7100
Wire Wire Line
	2650 7100 2650 7050
Connection ~ 2650 7100
Wire Wire Line
	2650 7450 2650 7400
Wire Wire Line
	2500 7400 2650 7400
Wire Wire Line
	2650 7400 2800 7400
Connection ~ 2650 7400
$Comp
L +3.3V #PWR?
U 1 1 5A7BAC77
P 2650 7050
F 0 "#PWR?" H 2650 6900 50  0001 C CNN
F 1 "+3.3V" H 2650 7190 50  0000 C CNN
F 2 "" H 2650 7050 50  0001 C CNN
F 3 "" H 2650 7050 50  0001 C CNN
	1    2650 7050
	1    0    0    -1  
$EndComp
$Comp
L CP2102N U?
U 1 1 5A7BAC78
P 3900 3450
F 0 "U?" H 3900 4250 60  0000 C CNN
F 1 "CP2102N" H 4350 2600 60  0000 C CNN
F 2 "" H 3900 3450 60  0001 C CNN
F 3 "" H 3900 3450 60  0001 C CNN
	1    3900 3450
	1    0    0    -1  
$EndComp
Wire Wire Line
	2500 5700 3800 5700
Wire Wire Line
	1300 6100 1300 6050
Wire Wire Line
	2850 6100 2850 6050
Connection ~ 2050 6100
$Comp
L Q_NPN_BCE Q?
U 1 1 5A7BF0F3
P 3900 5950
F 0 "Q?" H 4100 6000 50  0000 L CNN
F 1 "Q_NPN_BCE" H 4100 5900 50  0000 L CNN
F 2 "" H 4100 6050 50  0001 C CNN
F 3 "" H 3900 5950 50  0001 C CNN
	1    3900 5950
	-1   0    0    -1  
$EndComp
$Comp
L R R?
U 1 1 5A7BF247
P 3800 5500
F 0 "R?" V 3880 5500 50  0000 C CNN
F 1 "10k" V 3800 5500 50  0000 C CNN
F 2 "" V 3730 5500 50  0001 C CNN
F 3 "" H 3800 5500 50  0001 C CNN
	1    3800 5500
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR?
U 1 1 5A7BF347
P 3800 6150
F 0 "#PWR?" H 3800 5900 50  0001 C CNN
F 1 "GND" H 3800 6000 50  0000 C CNN
F 2 "" H 3800 6150 50  0001 C CNN
F 3 "" H 3800 6150 50  0001 C CNN
	1    3800 6150
	1    0    0    -1  
$EndComp
Wire Wire Line
	3800 5250 3800 5350
Wire Wire Line
	3800 5650 3800 5700
Wire Wire Line
	3800 5700 3800 5750
Connection ~ 3800 5700
$Comp
L R R?
U 1 1 5A7BF753
P 4250 5950
F 0 "R?" V 4330 5950 50  0000 C CNN
F 1 "2k" V 4250 5950 50  0000 C CNN
F 2 "" V 4180 5950 50  0001 C CNN
F 3 "" H 4250 5950 50  0001 C CNN
	1    4250 5950
	0    1    1    0   
$EndComp
$Comp
L VBUS #PWR?
U 1 1 5A7BF7E2
P 4450 5950
F 0 "#PWR?" H 4450 5800 50  0001 C CNN
F 1 "VBUS" H 4450 6100 50  0000 C CNN
F 2 "" H 4450 5950 50  0001 C CNN
F 3 "" H 4450 5950 50  0001 C CNN
	1    4450 5950
	1    0    0    -1  
$EndComp
Wire Wire Line
	4400 5950 4450 5950
Wire Notes Line
	3200 5150 3200 6500
Wire Notes Line
	3200 6500 4650 6500
Wire Notes Line
	4650 6500 4650 5150
Wire Notes Line
	4650 5150 3200 5150
Text Notes 3300 6450 0    40   ~ 0
Disable boost supply on external power
Wire Notes Line
	700  4900 3050 4900
Wire Notes Line
	3050 4900 3050 6350
Wire Notes Line
	3050 6350 700  6350
Wire Notes Line
	700  6350 700  4900
Text Notes 750  5000 0    40   ~ 0
Boost Supply. Sufficient for LCD w/o backlight and *perhaps* CO2 sensor
$Comp
L GS2 J?
U 1 1 5A7C33CA
P 900 7200
F 0 "J?" H 1000 7350 50  0000 C CNN
F 1 "GS2" H 1000 7051 50  0000 C CNN
F 2 "Connectors:GS2" V 974 7200 50  0001 C CNN
F 3 "" H 900 7200 50  0001 C CNN
	1    900  7200
	1    0    0    -1  
$EndComp
$Comp
L +5V #PWR?
U 1 1 5A7C3489
P 900 7000
F 0 "#PWR?" H 900 6850 50  0001 C CNN
F 1 "+5V" H 900 7140 50  0000 C CNN
F 2 "" H 900 7000 50  0001 C CNN
F 3 "" H 900 7000 50  0001 C CNN
	1    900  7000
	1    0    0    -1  
$EndComp
$Comp
L VBUS #PWR?
U 1 1 5A7C34EB
P 900 7400
F 0 "#PWR?" H 900 7250 50  0001 C CNN
F 1 "VBUS" H 900 7550 50  0000 C CNN
F 2 "" H 900 7400 50  0001 C CNN
F 3 "" H 900 7400 50  0001 C CNN
	1    900  7400
	-1   0    0    1   
$EndComp
Wire Notes Line
	8150 5050 10350 5050
Wire Notes Line
	10350 5050 10350 6600
Wire Notes Line
	10350 6600 8150 6600
Wire Notes Line
	8150 6600 8150 5050
$EndSCHEMATC