Schematic

E+
E-
A-
A+
Shield
Power the board with 4.5-5.5V
VBG = 1.25V
GND
GND
GNDGND
GND
10K
1K
0.1uF
0.1uF
1.0uF
10uF
USBSMD
GND GND
GND
3.3V
GND GND
Yellow
GREEN
5V
5V
5V
1K 1K
0.1uF0.1uF
AVR_PRG
GND
BLUE
HX711
100
100
GND
GND
10K
GND
0.1uF
PTCSMD
5V
5V
5V 5V
5V
Temp
5V
GND
TMP102
GND
0.1uF
GND
3.3V
3.3V
4.7K
4.7K
3.3V
3.3V
3.3V
16MHZ
Fixed Gain 32
0.1uF
GND GND
Reset
FT231XS
27
27
47pF47pF
GNDGND
5V
GND
1K
1K
ATMEGA328P_TQFP
200mA/50V
200mA/50V
FTDI_BASIC
5V
5V
4.7K
5V
MMBT4403
5V
20k8.2K
0.1uF
GND
1.0uF
1.0uF
5V
GND
Screw
Load
Screw Terminals
3.3uH
UL
UR
LL
LR
5V
3.3V
10K 10K
5V
GND
0.1uF
GND
3.3V
GND
R2
R5
C6
C1
C4
C9
D+
D-
VBUS
GND
JP7
D1 D2
R13 R15
C10C7
JP5
1 2
3 4
5 6
D3
U1
VSUP
BASE
AVDD
VFB
AGND
VBG
INA-
INA+
INB-
INB+
PD_SCK
DOUT
XO
XI
RATE
DVDD
R3
R4
R7
C8
F1
JP1
1
2
3
SCL
1
GND
2
ALERT
3
ADD0
4
VCC
5
SDA
6
U3
C3
R8
R9
Y2
SJ2
JP2
1
2
C16
S2
VCC
15
VCCIO
3
3V3OUT
13
USBDM
12
USBDP
11
RESET
14
GND
6
GND
16
TXD
20
CBUS3
19
CBUS2
10
CBUS1
17
CBUS0
18
RI
5
DCD
8
DSR
7
DTR
1
CTS
9
RTS
2
RXD
4
U6
R1
R6
C2C5
R11
R12
U4
PB5(SCK)
17
PB7(XTAL2/TOSC2)
8
PB6(XTAL1/TOSC1)
7
GND
3
GND
5
VCC
4
VCC
6
AGND
21
AREF
20
AVCC
18
PB4(MISO)
16
PB3(MOSI/OC2)
15
PB2(SS/OC1B)
14
PB1(OC1A)
13
PB0(ICP)
12
PD7(AIN1)
11
PD6(AIN0)
10
PD5(T1)
9
PD4(XCK/T0)
2
PD3(INT1)
1
PD2(INT0)
32
PD1(TXD)
31
PD0(RXD)
30
ADC7
22
ADC6
19
PC5(ADC5/SCL)
28
PC4(ADC4/SDA)
27
PC3(ADC3)
26
PC2(ADC2)
25
PC1(ADC1)
24
PC0(ADC0)
23
PC6(/RESET)
29
Q1
Q2
DTR
RXI
TXO
VCC
CTS
GND
JP9
R14
Q3
R16R17
C11
C12
C13
JP4
1
2
3
JP3
1
2
3
4
5
JP11
1
2
3
4
5
L1
J2
1
2
3
J3
1
2
3
J4
1
2
3
J5
1
2
3
J1
JP6
R10 R18
C14
RST
RST
D11
D11
RXD
RXD
RXD
TXD
TXD
TXD
DTR
DTR
DTR
SDA
SDA
SCL
SCL
TEMP_DAT
TEMP_DAT
D12
D12
RXLED
TXLED
LC_DOUT
LC_DOUT
AVDD
AVDD
A-
A-
LC_SCK
LC_SCK
B-
ALERT
ALERT
D13
D13
B+
A+
A+
USB
Released under the Creative Commons
Attribution Share-Alike 4.0 License
https://creativecommons.org/licenses/by-sa/4.0/
Design by:
MOSI
RESET
SCK
MISO
+5
GND