Logical pinout · physical placement not verified

GND12PIN connector: 1 and 5; I2C/UART interface: GND
Ground on 12PIN connector, I2C interface, and UART interface per Waveshare wiki pin tables
Type · Ground
VBus12PIN connector pin 2
5V USB power supply on the 12PIN connector
Type · PowerVoltage · 5V
D-12PIN connector pin 3
USB differential cable, GPIO19 alternative, on the 12PIN connector
Type · USB
D+12PIN connector pin 4
USB differential cable, GPIO20 alternative, on the 12PIN connector
Type · USB
3V312PIN connector pin 6; I2C/UART interface: 3V3
3.3V external output on the 12PIN connector, I2C interface, and UART interface
Type · PowerVoltage · 3.3V
SCL12PIN connector pin 7; I2C interface: SCL
I2C clock, GPIO10, cannot be used as GPIO per Waveshare wiki
Type · I2CVoltage · 3.3V logic
SDA12PIN connector pin 8; I2C interface: SDA
I2C data, GPIO11, cannot be used as GPIO per Waveshare wiki
Type · I2CVoltage · 3.3V logic
TXD12PIN connector pin 9; UART interface: TXD
UART transmit data, GPIO43 alternative, on 12PIN connector and UART interface
Type · UARTVoltage · 3.3V logic
RXD12PIN connector pin 10; UART interface: RXD
UART receive data, GPIO44 alternative, on 12PIN connector and UART interface
Type · UARTVoltage · 3.3V logic
IO1812PIN connector pin 11
Spare GPIO18 pinout on the 12PIN connector
Type · GPIOVoltage · 3.3V logic
IO1512PIN connector pin 12
Spare GPIO15 pinout on the 12PIN connector
Type · GPIOVoltage · 3.3V logic

Pin	Position	Type	Function	Voltage
GND	12PIN connector: 1 and 5; I2C/UART interface: GND	Ground	Ground on 12PIN connector, I2C interface, and UART interface per Waveshare wiki pin tables
VBus	12PIN connector pin 2	Power	5V USB power supply on the 12PIN connector	5V
D-	12PIN connector pin 3	USB	USB differential cable, GPIO19 alternative, on the 12PIN connector
D+	12PIN connector pin 4	USB	USB differential cable, GPIO20 alternative, on the 12PIN connector
3V3	12PIN connector pin 6; I2C/UART interface: 3V3	Power	3.3V external output on the 12PIN connector, I2C interface, and UART interface	3.3V
SCL	12PIN connector pin 7; I2C interface: SCL	I2C	I2C clock, GPIO10, cannot be used as GPIO per Waveshare wiki	3.3V logic
SDA	12PIN connector pin 8; I2C interface: SDA	I2C	I2C data, GPIO11, cannot be used as GPIO per Waveshare wiki	3.3V logic
TXD	12PIN connector pin 9; UART interface: TXD	UART	UART transmit data, GPIO43 alternative, on 12PIN connector and UART interface	3.3V logic
RXD	12PIN connector pin 10; UART interface: RXD	UART	UART receive data, GPIO44 alternative, on 12PIN connector and UART interface	3.3V logic
IO18	12PIN connector pin 11	GPIO	Spare GPIO18 pinout on the 12PIN connector	3.3V logic
IO15	12PIN connector pin 12	GPIO	Spare GPIO15 pinout on the 12PIN connector	3.3V logic

Logical pinout · physical placement not verified

Pin details

11 connections

GND
Ground on 12PIN connector, I2C interface, and UART interface per Waveshare wiki pin tables
Ground
12PIN connector: 1 and 5; I2C/UART interface: GND
VBus
5V USB power supply on the 12PIN connector
PowerVoltage · 5V
12PIN connector pin 2
D-
USB differential cable, GPIO19 alternative, on the 12PIN connector
USB
12PIN connector pin 3
D+
USB differential cable, GPIO20 alternative, on the 12PIN connector
USB
12PIN connector pin 4
3V3
3.3V external output on the 12PIN connector, I2C interface, and UART interface
PowerVoltage · 3.3V
12PIN connector pin 6; I2C/UART interface: 3V3
SCL
I2C clock, GPIO10, cannot be used as GPIO per Waveshare wiki
I2CVoltage · 3.3V logic
12PIN connector pin 7; I2C interface: SCL
SDA
I2C data, GPIO11, cannot be used as GPIO per Waveshare wiki
I2CVoltage · 3.3V logic
12PIN connector pin 8; I2C interface: SDA
TXD
UART transmit data, GPIO43 alternative, on 12PIN connector and UART interface
UARTVoltage · 3.3V logic
12PIN connector pin 9; UART interface: TXD
RXD
UART receive data, GPIO44 alternative, on 12PIN connector and UART interface
UARTVoltage · 3.3V logic
12PIN connector pin 10; UART interface: RXD
IO18
Spare GPIO18 pinout on the 12PIN connector
GPIOVoltage · 3.3V logic
12PIN connector pin 11
IO15
Spare GPIO15 pinout on the 12PIN connector
GPIOVoltage · 3.3V logic
12PIN connector pin 12

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