EESchema Schematic File Version 2
LIBS:adc_dac
LIBS:atmel_avr
LIBS:borg
LIBS:breakout_boards
LIBS:common_devices
LIBS:conn_gen
LIBS:conn_special
LIBS:digital_logic
LIBS:driver
LIBS:el_mech
LIBS:i2c
LIBS:mechanical
LIBS:opamp
LIBS:optoisol
LIBS:power
LIBS:power_supply
LIBS:radio_tv
LIBS:sensor
LIBS:serial_interface
LIBS:storage
LIBS:sureelectronics.net
EELAYER 25 0
EELAYER END
$Descr A4 11693 8268
encoding utf-8
Sheet 1 1
Title ""
Date ""
Rev ""
Comp ""
Comment1 ""
Comment2 ""
Comment3 ""
Comment4 ""
$EndDescr
$Comp
L CONN_4 P?
U 1 1 584FF9EF
P 2450 4650
F 0 "P?" H 2450 5000 60  0000 C CNN
F 1 "WEIGHT_SENSOR" H 2250 4900 60  0000 C CNN
F 2 "" H 2450 4650 60  0000 C CNN
F 3 "" H 2450 4650 60  0000 C CNN
	1    2450 4650
	1    0    0    -1  
$EndComp
$Comp
L R R?
U 1 1 584FFA3E
P 2800 5100
F 0 "R?" V 2880 5100 50  0000 C CNN
F 1 "1k" V 2800 5100 50  0000 C CNN
F 2 "" H 2800 5100 60  0000 C CNN
F 3 "" H 2800 5100 60  0000 C CNN
	1    2800 5100
	1    0    0    -1  
$EndComp
$Comp
L P P1
U 1 1 584FFA57
P 3300 5400
F 0 "P1" V 3225 5425 50  0000 C CNN
F 1 "1k" V 3150 5425 50  0000 C CNN
F 2 "" H 3300 5400 60  0000 C CNN
F 3 "" H 3300 5400 60  0000 C CNN
	1    3300 5400
	0    1    1    0   
$EndComp
Text Notes 1900 4650 0    60   ~ 0
750
Text Notes 1900 4750 0    60   ~ 0
750
$Comp
L R R?
U 1 1 584FFB95
P 3000 5100
F 0 "R?" V 3080 5100 50  0000 C CNN
F 1 "3k3" V 3000 5100 50  0000 C CNN
F 2 "" H 3000 5100 60  0000 C CNN
F 3 "" H 3000 5100 60  0000 C CNN
	1    3000 5100
	1    0    0    -1  
$EndComp
$Comp
L R R?
U 1 1 584FFC1E
P 3600 5100
F 0 "R?" V 3680 5100 50  0000 C CNN
F 1 "3k3" V 3600 5100 50  0000 C CNN
F 2 "" H 3600 5100 60  0000 C CNN
F 3 "" H 3600 5100 60  0000 C CNN
	1    3600 5100
	1    0    0    -1  
$EndComp
$Comp
L R R?
U 1 1 584FFC24
P 3800 5100
F 0 "R?" V 3880 5100 50  0000 C CNN
F 1 "1k" V 3800 5100 50  0000 C CNN
F 2 "" H 3800 5100 60  0000 C CNN
F 3 "" H 3800 5100 60  0000 C CNN
	1    3800 5100
	1    0    0    -1  
$EndComp
$Comp
L CONN_4 P?
U 1 1 584FFE89
P 5400 4750
F 0 "P?" H 5400 5000 60  0000 C CNN
F 1 "HX711_DIGITAL" V 5250 4750 60  0000 C CNN
F 2 "" H 5400 4750 60  0000 C CNN
F 3 "" H 5400 4750 60  0000 C CNN
	1    5400 4750
	1    0    0    -1  
$EndComp
$Comp
L CONN_6 P?
U 1 1 584FFEAE
P 4600 4750
F 0 "P?" H 4600 5100 60  0000 C CNN
F 1 "HX711_ANALOG" V 4450 4750 60  0000 C CNN
F 2 "" H 4600 4750 60  0000 C CNN
F 3 "" H 4600 4750 60  0000 C CNN
	1    4600 4750
	-1   0    0    1   
$EndComp
Text Notes 4500 5000 0    60   ~ 0
E+\nE-\nA+\nA-\nB+\nB-
Text Notes 5300 4900 0    60   ~ 0
GND\nDT\nCLK\nVCC
$Comp
L ATMEGA48 U?
U 1 1 5857C646
P 4500 2550
F 0 "U?" H 4600 3550 60  0000 C CNN
F 1 "ATMEGA48" H 4600 3400 60  0000 C CNN
F 2 "" H 4500 3400 60  0000 C CNN
F 3 "" H 4500 3400 60  0000 C CNN
	1    4500 2550
	1    0    0    -1  
$EndComp
$Comp
L CONN_16 P?
U 1 1 5857C697
P 7300 2750
F 0 "P?" H 7300 3700 60  0000 C CNN
F 1 "CONN_16" H 7300 3600 60  0000 C CNN
F 2 "" H 7300 2750 60  0000 C CNN
F 3 "" H 7300 2750 60  0000 C CNN
	1    7300 2750
	-1   0    0    -1  
$EndComp
$Comp
L AVR_Prog P?
U 1 1 5857C82A
P 2450 1750
F 0 "P?" H 2450 2200 60  0000 C CNN
F 1 "AVR_Prog" H 2450 2100 60  0000 C CNN
F 2 "" H 2450 1750 60  0000 C CNN
F 3 "" H 2450 1750 60  0000 C CNN
	1    2450 1750
	1    0    0    -1  
$EndComp
$Comp
L C C?
U 1 1 5857C8F8
P 3600 1600
F 0 "C?" V 3700 1600 50  0000 C CNN
F 1 "100n" V 3775 1600 50  0000 C CNN
F 2 "" H 3600 1600 60  0000 C CNN
F 3 "" H 3600 1600 60  0000 C CNN
	1    3600 1600
	-1   0    0    -1  
$EndComp
$Comp
L MOSFET_N Q?
U 1 1 5857C925
P 7000 4500
F 0 "Q?" H 6750 4650 60  0000 C CNN
F 1 "MOSFET_N" H 6750 4750 60  0000 C CNN
F 2 "" H 7000 4500 60  0000 C CNN
F 3 "" H 7000 4500 60  0000 C CNN
	1    7000 4500
	1    0    0    -1  
$EndComp
$Comp
L R R?
U 1 1 5857C9CA
P 7000 3900
F 0 "R?" V 7080 3900 50  0000 C CNN
F 1 "R" V 7000 3900 50  0000 C CNN
F 2 "" H 7000 3900 60  0000 C CNN
F 3 "" H 7000 3900 60  0000 C CNN
	1    7000 3900
	1    0    0    -1  
$EndComp
$Comp
L VCC #PWR?
U 1 1 5857CAF8
P 2800 1300
F 0 "#PWR?" H 2800 1400 30  0001 C CNN
F 1 "VCC" H 2800 1410 30  0000 C CNN
F 2 "" H 2800 1300 60  0000 C CNN
F 3 "" H 2800 1300 60  0000 C CNN
	1    2800 1300
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR?
U 1 1 5857CB28
P 6000 4700
F 0 "#PWR?" H 6000 4700 30  0001 C CNN
F 1 "GND" H 6000 4630 30  0000 C CNN
F 2 "" H 6000 4700 60  0000 C CNN
F 3 "" H 6000 4700 60  0000 C CNN
	1    6000 4700
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR?
U 1 1 5857CB56
P 3900 3800
F 0 "#PWR?" H 3900 3800 30  0001 C CNN
F 1 "GND" H 3900 3730 30  0000 C CNN
F 2 "" H 3900 3800 60  0000 C CNN
F 3 "" H 3900 3800 60  0000 C CNN
	1    3900 3800
	1    0    0    -1  
$EndComp
$Comp
L X X?
U 1 1 5857CB6C
P 3150 3300
F 0 "X?" H 3150 3400 60  0000 C CNN
F 1 "7.3728MHz" H 3150 3500 60  0000 C CNN
F 2 "" H 3150 3300 60  0000 C CNN
F 3 "" H 3150 3300 60  0000 C CNN
	1    3150 3300
	1    0    0    -1  
$EndComp
$Comp
L C C?
U 1 1 5857CC3B
P 2800 3500
F 0 "C?" V 2900 3500 50  0000 C CNN
F 1 "22p" V 2975 3500 50  0000 C CNN
F 2 "" H 2800 3500 60  0000 C CNN
F 3 "" H 2800 3500 60  0000 C CNN
	1    2800 3500
	1    0    0    -1  
$EndComp
$Comp
L C C?
U 1 1 5857CCCC
P 3500 3500
F 0 "C?" V 3600 3500 50  0000 C CNN
F 1 "22p" V 3675 3500 50  0000 C CNN
F 2 "" H 3500 3500 60  0000 C CNN
F 3 "" H 3500 3500 60  0000 C CNN
	1    3500 3500
	1    0    0    -1  
$EndComp
Wire Notes Line
	2350 4600 2275 4600
Wire Notes Line
	2275 4575 2275 4625
Wire Notes Line
	2275 4625 2150 4625
Wire Notes Line
	2150 4625 2150 4575
Wire Notes Line
	2150 4575 2275 4575
Wire Notes Line
	2150 4600 2100 4600
Wire Notes Line
	2350 4700 2275 4700
Wire Notes Line
	2275 4675 2275 4725
Wire Notes Line
	2275 4725 2150 4725
Wire Notes Line
	2150 4725 2150 4675
Wire Notes Line
	2150 4675 2275 4675
Wire Notes Line
	2150 4700 2100 4700
Wire Notes Line
	2100 4700 2100 4500
Wire Notes Line
	2100 4500 2350 4500
Wire Wire Line
	2800 5600 3400 5600
Wire Wire Line
	3400 5600 3800 5600
Wire Wire Line
	3800 5600 4200 5600
Wire Wire Line
	2800 5600 2800 5300
Connection ~ 3400 5600
Wire Wire Line
	3800 5600 3800 5300
Wire Wire Line
	3600 5300 3600 5400
Wire Wire Line
	3600 5400 3500 5400
Wire Wire Line
	3100 5400 3000 5400
Wire Wire Line
	3000 5400 3000 5300
Wire Wire Line
	2800 4900 2800 4700
Wire Wire Line
	2650 4700 2800 4700
Wire Wire Line
	2800 4700 3000 4700
Wire Wire Line
	3000 4700 4000 4700
Wire Wire Line
	3000 4700 3000 4900
Connection ~ 2800 4700
Wire Wire Line
	3600 4900 3600 4600
Wire Wire Line
	2650 4600 3600 4600
Wire Wire Line
	3600 4600 3800 4600
Wire Wire Line
	3800 4600 4100 4600
Wire Wire Line
	3800 4600 3800 4900
Connection ~ 3600 4600
Wire Wire Line
	3400 5600 3400 5500
Wire Wire Line
	2650 4500 4400 4500
Wire Wire Line
	4100 4600 4100 4700
Wire Wire Line
	4100 4700 4400 4700
Connection ~ 3800 4600
Wire Wire Line
	4400 4800 4000 4800
Wire Wire Line
	4000 4800 4000 4700
Connection ~ 3000 4700
Wire Wire Line
	4200 5600 4200 4600
Wire Wire Line
	4200 4600 4400 4600
Connection ~ 3800 5600
Wire Notes Line
	4500 5050 4500 5300
Wire Notes Line
	4500 5300 5500 5300
Wire Notes Line
	5500 5300 5500 4950
Wire Notes Line
	5500 4550 5500 4300
Wire Notes Line
	5500 4300 4500 4300
Wire Notes Line
	4500 4300 4500 4450
Wire Wire Line
	3700 3000 2800 3000
Wire Wire Line
	2800 3000 2800 3300
Wire Wire Line
	2800 3300 2800 3400
Wire Wire Line
	2800 3300 3000 3300
Wire Wire Line
	3300 3300 3500 3300
Wire Wire Line
	3500 3100 3500 3300
Wire Wire Line
	3500 3300 3500 3400
Wire Wire Line
	3500 3100 3700 3100
Wire Wire Line
	3900 3600 3900 3700
Wire Wire Line
	3900 3700 3900 3800
Wire Wire Line
	2800 3700 3500 3700
Wire Wire Line
	3500 3700 3900 3700
Wire Wire Line
	3900 3700 4050 3700
Wire Wire Line
	2800 3700 2800 3600
Connection ~ 2800 3300
Connection ~ 3500 3300
Wire Wire Line
	3500 3600 3500 3700
Connection ~ 3500 3700
Connection ~ 3900 3700
Wire Wire Line
	4050 3700 4050 3600
Wire Wire Line
	4050 1400 4050 1500
Wire Wire Line
	2800 1400 3600 1400
Wire Wire Line
	3600 1400 3900 1400
Wire Wire Line
	3900 1400 4050 1400
Wire Wire Line
	3900 1400 3900 1500
$Comp
L GND #PWR?
U 1 1 5857D5E4
P 3600 1800
F 0 "#PWR?" H 3600 1800 30  0001 C CNN
F 1 "GND" H 3600 1730 30  0000 C CNN
F 2 "" H 3600 1800 60  0000 C CNN
F 3 "" H 3600 1800 60  0000 C CNN
	1    3600 1800
	1    0    0    -1  
$EndComp
Wire Wire Line
	3600 1700 3600 1800
Wire Wire Line
	3600 1500 3600 1400
Connection ~ 3900 1400
Wire Wire Line
	2800 1600 2700 1600
Wire Wire Line
	2800 1300 2800 1400
Wire Wire Line
	2800 1400 2800 1600
Connection ~ 3600 1400
$Comp
L GND #PWR?
U 1 1 5857D878
P 2800 2100
F 0 "#PWR?" H 2800 2100 30  0001 C CNN
F 1 "GND" H 2800 2030 30  0000 C CNN
F 2 "" H 2800 2100 60  0000 C CNN
F 3 "" H 2800 2100 60  0000 C CNN
	1    2800 2100
	1    0    0    -1  
$EndComp
Wire Wire Line
	2800 2000 2800 2100
Wire Wire Line
	2800 2000 2700 2000
Wire Wire Line
	2700 1500 3300 1500
Wire Wire Line
	3300 1500 3300 2800
Wire Wire Line
	3300 2800 3700 2800
Wire Wire Line
	2700 1700 3200 1700
Wire Wire Line
	3200 1700 3200 2900
Wire Wire Line
	3200 2900 3700 2900
Wire Wire Line
	2700 1800 3400 1800
Wire Wire Line
	3400 1800 3400 2700
Wire Wire Line
	3400 2700 3700 2700
Wire Wire Line
	2700 1900 3000 1900
Wire Wire Line
	3000 1900 3000 1200
Wire Wire Line
	3000 1200 5400 1200
Wire Wire Line
	5400 1200 5400 2500
Wire Wire Line
	5400 2500 5300 2500
Connection ~ 2800 1400
Wire Wire Line
	5300 1900 6400 1900
Wire Wire Line
	6400 1900 6400 3000
Wire Wire Line
	6400 3000 7100 3000
Wire Wire Line
	7100 3100 6300 3100
Wire Wire Line
	6300 3100 6300 2000
Wire Wire Line
	6300 2000 5300 2000
Wire Wire Line
	5300 2100 6200 2100
Wire Wire Line
	6200 2100 6200 3200
Wire Wire Line
	6200 3200 7100 3200
Wire Wire Line
	7100 3300 6100 3300
Wire Wire Line
	6100 3300 6100 2200
Wire Wire Line
	6100 2200 5300 2200
$Comp
L VCC #PWR?
U 1 1 5857F0E6
P 7000 1300
F 0 "#PWR?" H 7000 1400 30  0001 C CNN
F 1 "VCC" H 7000 1410 30  0000 C CNN
F 2 "" H 7000 1300 60  0000 C CNN
F 3 "" H 7000 1300 60  0000 C CNN
	1    7000 1300
	1    0    0    -1  
$EndComp
$Comp
L GND #PWR?
U 1 1 5857F0FD
P 7000 4800
F 0 "#PWR?" H 7000 4800 30  0001 C CNN
F 1 "GND" H 7000 4730 30  0000 C CNN
F 2 "" H 7000 4800 60  0000 C CNN
F 3 "" H 7000 4800 60  0000 C CNN
	1    7000 4800
	1    0    0    -1  
$EndComp
Wire Wire Line
	7000 4700 7000 4800
Wire Wire Line
	7000 1300 7000 1400
Wire Wire Line
	7000 1400 7000 2100
Wire Wire Line
	7000 2100 7000 3400
Wire Wire Line
	7000 2100 7100 2100
Wire Wire Line
	7000 3400 7100 3400
Connection ~ 7000 2100
$Comp
L GND #PWR?
U 1 1 5857F219
P 6800 2600
F 0 "#PWR?" H 6800 2600 30  0001 C CNN
F 1 "GND" H 6800 2530 30  0000 C CNN
F 2 "" H 6800 2600 60  0000 C CNN
F 3 "" H 6800 2600 60  0000 C CNN
	1    6800 2600
	1    0    0    -1  
$EndComp
Wire Wire Line
	6800 2000 6800 2400
Wire Wire Line
	6800 2400 6800 2600
Wire Wire Line
	6800 2000 7100 2000
$Comp
L P P2
U 1 1 5857F3B6
P 6700 1400
F 0 "P2" V 6625 1425 50  0000 C CNN
F 1 "10k" V 6550 1425 50  0000 C CNN
F 2 "" H 6700 1400 60  0000 C CNN
F 3 "" H 6700 1400 60  0000 C CNN
	1    6700 1400
	0    -1   1    0   
$EndComp
Wire Wire Line
	7000 1400 6900 1400
Connection ~ 7000 1400
$Comp
L GND #PWR?
U 1 1 5857F560
P 6400 1500
F 0 "#PWR?" H 6400 1500 30  0001 C CNN
F 1 "GND" H 6400 1430 30  0000 C CNN
F 2 "" H 6400 1500 60  0000 C CNN
F 3 "" H 6400 1500 60  0000 C CNN
	1    6400 1500
	1    0    0    -1  
$EndComp
Wire Wire Line
	6400 1400 6400 1500
Wire Wire Line
	6400 1400 6500 1400
Wire Wire Line
	6600 1500 6600 2200
Wire Wire Line
	6600 2200 7100 2200
Wire Wire Line
	5300 2300 6000 2300
Wire Wire Line
	6000 2300 6000 2500
Wire Wire Line
	6000 2500 7100 2500
Wire Wire Line
	7100 2400 6800 2400
Connection ~ 6800 2400
Wire Wire Line
	7000 4300 7000 4100
Wire Wire Line
	7000 3700 7000 3500
Wire Wire Line
	7000 3500 7100 3500
Wire Wire Line
	5300 3400 6400 3400
Wire Wire Line
	6400 3400 6400 4600
Wire Wire Line
	6400 4600 6700 4600
Wire Wire Line
	6000 4700 6000 4600
Wire Wire Line
	6000 4600 5600 4600
$Comp
L VCC #PWR?
U 1 1 5857FED0
P 6200 4800
F 0 "#PWR?" H 6200 4900 30  0001 C CNN
F 1 "VCC" H 6200 4910 30  0000 C CNN
F 2 "" H 6200 4800 60  0000 C CNN
F 3 "" H 6200 4800 60  0000 C CNN
	1    6200 4800
	1    0    0    -1  
$EndComp
Wire Wire Line
	6200 4800 6200 4900
Wire Wire Line
	6200 4900 5600 4900
Wire Wire Line
	5300 2400 6600 2400
Wire Wire Line
	6600 2400 6600 2300
Wire Wire Line
	6600 2300 7100 2300
Wire Wire Line
	5600 4700 5700 4700
Wire Wire Line
	5700 4700 5700 4100
Wire Wire Line
	5700 4100 2400 4100
Wire Wire Line
	2400 4100 2400 2400
Wire Wire Line
	2400 2400 3700 2400
Wire Wire Line
	3700 2500 2500 2500
Wire Wire Line
	2500 2500 2500 4000
Wire Wire Line
	2500 4000 5800 4000
Wire Wire Line
	5800 4000 5800 4800
Wire Wire Line
	5800 4800 5600 4800
$EndSCHEMATC