Schematic

This board is meant to be used with Qwiic.
The boot header is meant for Serial Basic connection for programming.
I2C Pull-up
CommunicationMicroSD Socket
ISP Header
7-Bit I2C Address Jumper
Closed = 0x29
Open (default) = 0x2A
0.1uF
GND
GREEN
GND
3.3V
3.3V
16MHZ
GND
3.3V
GND
0.1uF
RED
GND
3.3V
GND
GND
3.3V
GND
3.3V
GND
3.3V
GND
3.3V
GND
3.3V
GND
3.3V
3.3V
GND
ATMEGA328P
3.3V
MICRO-SD
C3
D3
Q1
C2
D1
1
2
3
4
1
2
3
4
1
2
3
4
ADR
1 2
3 4
5 6
PB5(SCK)
17
PB7(XTAL2/TOSC2)
8
PB6(XTAL1/TOSC1)
7
GND
3*2
VCC
4*2
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
U2
1
2
3
4
5
6
CS
DI
DO
GND
NC
RSV
SCK
SHIELD
VCC
J1
SCK
SCK
SCK
MISO
MISO
MISO
MOSI
MOSI
MOSI
TXO
TXO
DTR
DTR
RXI
RXI
RST
CS
CS
SCL SCL
SCL
SCL
SCL
SDA SDA
SDA
SDA
SDA
ADDR
ADDR
V12
N. Seidle
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