Nucleo-F103RB

Below are the pins usable for the peripherals. Pins in bold are the default.

SPI

Instance	MOSI	MISO	SCK
SPI1	11 (PA7), 4 (PB5)	12 (PA6), 5 (PB4)	13 (PA5), 3 (PB3)
SPI2	33 (PB15)	32 (PB14)	31 (PB13)

I2C

Instance	SDA	SCL
I2C1	29 (PB7), 14 (PB9)	10 (PB6), 15 (PB8)
I2C2	PB11	6 (PB10)

USART

Instance	RX	TX
USART1	2 (PA10), 29 (PB7)	8 (PA9), 10 (PB6)
USART2	0 (PA3)	1 (PA2)
USART3	PB11, 42 (PC11)	6 (PB10), 41 (PC10)

TIM

Instance	CH1	CH2	CH3	CH4
TIM1	7 (PA8), 11 (PA7), 31 (PB13)	8 (PA9), 19 (PB0), 32 (PB14)	2 (PA10), 27 (PB1), 33 (PB15)	22 (PA11)
TIM2	16 (PA0), 26 (PA15)	17 (PA1), 3 (PB3)	1 (PA2), 6 (PB10)	0 (PA3), PB11
TIM3	12 (PA6), 5 (PB4), 38 (PC6)	11 (PA7), 4 (PB5), 9 (PC7)	19 (PB0), 39 (PC8)	27 (PB1), 40 (PC9)
TIM4	10 (PB6)	29 (PB7)	15 (PB8)	14 (PB9)

ADC

Instance	Channel	Pin
ADC1	IN0	16 (PA0)
ADC1	IN1	17 (PA1)
ADC1	IN2	1 (PA2)
ADC1	IN3	0 (PA3)
ADC1	IN4	18 (PA4)
ADC1	IN5	13 (PA5)
ADC1	IN6	12 (PA6)
ADC1	IN7	11 (PA7)
ADC1	IN8	19 (PB0)
ADC1	IN9	27 (PB1)
ADC1	IN10	21 (PC0)
ADC1	IN11	20 (PC1)
ADC1	IN12	34 (PC2)
ADC1	IN13	35 (PC3)
ADC1	IN14	36 (PC4)
ADC1	IN15	37 (PC5)
ADC2	IN0	16 (PA0)
ADC2	IN1	17 (PA1)
ADC2	IN2	1 (PA2)
ADC2	IN3	0 (PA3)
ADC2	IN4	18 (PA4)
ADC2	IN5	13 (PA5)
ADC2	IN6	12 (PA6)
ADC2	IN7	11 (PA7)
ADC2	IN8	19 (PB0)
ADC2	IN9	27 (PB1)
ADC2	IN10	21 (PC0)
ADC2	IN11	20 (PC1)
ADC2	IN12	34 (PC2)
ADC2	IN13	35 (PC3)
ADC2	IN14	36 (PC4)
ADC2	IN15	37 (PC5)

GPIO

Pin	Peripheral signal available on the pin	Board macro
0 (PA3)	ADC1_IN3, ADC2_IN3, TIM2_CH4, USART2_RX
1 (PA2)	ADC1_IN2, ADC2_IN2, TIM2_CH3, USART2_TX
2 (PA10)	TIM1_CH3, USART1_RX
3 (PB3)	SPI1_SCK, SYS_JTDO-TRACESWO, TIM2_CH2
4 (PB5)	I2C1_SMBA, SPI1_MOSI, TIM3_CH2
5 (PB4)	SPI1_MISO, SYS_NJTRST, TIM3_CH1
6 (PB10)	I2C2_SCL, TIM2_CH3, USART3_TX
7 (PA8)	RCC_MCO, TIM1_CH1, USART1_CK
8 (PA9)	TIM1_CH2, USART1_TX
9 (PC7)	TIM3_CH2
10 (PB6)	I2C1_SCL, TIM4_CH1, USART1_TX
11 (PA7)	ADC1_IN7, ADC2_IN7, SPI1_MOSI, TIM1_CH1N, TIM3_CH2	MOSI
12 (PA6)	ADC1_IN6, ADC2_IN6, SPI1_MISO, TIM1_BKIN, TIM3_CH1	MISO
13 (PA5)	ADC1_IN5, ADC2_IN5, SPI1_SCK	LED_BUILTIN, SCK
14 (PB9)	CAN_TX, I2C1_SDA, TIM4_CH4	SDA
15 (PB8)	CAN_RX, I2C1_SCL, TIM4_CH3	SCL
16 (PA0)	ADC1_IN0, ADC2_IN0, SYS_WKUP, TIM2_CH1, TIM2_ETR, USART2_CTS	A0
17 (PA1)	ADC1_IN1, ADC2_IN1, TIM2_CH2, USART2_RTS	A1
18 (PA4)	ADC1_IN4, ADC2_IN4, SPI1_NSS, USART2_CK	A2, SS
19 (PB0)	ADC1_IN8, ADC2_IN8, TIM1_CH2N, TIM3_CH3	A3
20 (PC1)	ADC1_IN11, ADC2_IN11	A4
21 (PC0)	ADC1_IN10, ADC2_IN10	A5
22 (PA11)	CAN_RX, TIM1_CH4, USART1_CTS, USB_DM
23 (PA12)	CAN_TX, TIM1_ETR, USART1_RTS, USB_DP
24 (PA13)	SYS_JTMS-SWDIO
25 (PA14)	SYS_JTCK-SWCLK
26 (PA15)	SPI1_NSS, SYS_JTDI, TIM2_CH1, TIM2_ETR
27 (PB1)	ADC1_IN9, ADC2_IN9, TIM1_CH3N, TIM3_CH4
28 (PB2)
29 (PB7)	I2C1_SDA, TIM4_CH2, USART1_RX
30 (PB12)	I2C2_SMBA, SPI2_NSS, TIM1_BKIN, USART3_CK
31 (PB13)	SPI2_SCK, TIM1_CH1N, USART3_CTS
32 (PB14)	SPI2_MISO, TIM1_CH2N, USART3_RTS
33 (PB15)	SPI2_MOSI, TIM1_CH3N
34 (PC2)	ADC1_IN12, ADC2_IN12
35 (PC3)	ADC1_IN13, ADC2_IN13
36 (PC4)	ADC1_IN14, ADC2_IN14
37 (PC5)	ADC1_IN15, ADC2_IN15
38 (PC6)	TIM3_CH1
39 (PC8)	TIM3_CH3
40 (PC9)	TIM3_CH4
41 (PC10)	USART3_TX
42 (PC11)	USART3_RX
43 (PC12)	USART3_CK
44 (PC13)	RTC_OUT, RTC_TAMPER
45 (PC14)	RCC_OSC32_IN
46 (PC15)	ADC1_EXTI15, ADC2_EXTI15, RCC_OSC32_OUT
47 (PD2)	TIM3_ETR