Name	Black Board
Part	Unknown
Brand	Unknown
Origin	China

Part	STM32F103C8T6
Manufacturer	ST-Microelectronics
Core	Arm Cortex-M3
Max. Clock Speed	72MHz
Package	LQFP 48 pins

FLASH	64KiB
SRAM	20KiB

HSI	8MHz
LSI	40kHz
HSE	8MHz
LSE	32.768kHz

Sources	Any +3.3V pin (+3.3V) Any +5V pin (+5V) USB connector (+5V)
VDDA pin	No
VSSA pin	No
VREF- pin	No
VREF+ pin	No
Backup battery	Pads

Manufacturer	Advanced Monolithic Systems Inc.
Part	AMS1117 (AMS1117)
Package	SOT223 3 pins
Input	+4.6V to +15V
Output	+3.3V @ 1A
Datasheet	AMS1117.pdf

Color	Black
Size (w x l)	41mm x 52mm
Mounting	4x mounting hole (M3)

• Warning: The +5V pins on this board are directly connected to the +5V pin of the USB connector. There is no protection in place. Do not power this board through USB and an external power supply at the same time.

• Perspective view
• Top view
• Bottom view
• Original schematic
• PCB
• Original schematic
• Blog post by Lup Yuen Lee

Name	RESET
Reference	S1
Type	Button
Connected to	NRST
Mode	Active low

Name	BOOT0
Reference	-
Type	2-way jumper
Connected to	BOOT0
Mode	N.A.

Name	BOOT1
Reference	-
Type	2-way jumper
Connected to	PB2
Mode	N.A.

Name	PA8
Reference	S2
Type	Button
Connected to	PA8
Mode	Active low

Name	-
Reference	D1
Type	LED
Connected to	+3.3V rail
Mode	N.A.

Name	PA1 LED
Reference	D2
Type	LED
Connected to	PA1
Mode	Sink

Name	Unknown
Reference	None
Type	Pin header (2.54mm, 10x2, male)

#	Name	Function	Connected to
1	B14	-	PB14
2	B15	-	PB15
3	B12	-	PB12
4	B13	-	PB13
5	B10	-	PB10
6	B11	-	PB11
7	B8	-	PB8
8	B9	-	PB9
9	B6	-	PB6
10	B7	-	PB7
11	B4	-	PB4
12	B5	-	PB5
13	B2	-	PB2
14	B3	-	PB3
15	B0	-	PB0
16	B1	-	PB1
17	C13	-	PC13
18	3.3	-	+3.3V rail
19	5V	-	+5V rail
20	GND	-	Ground plane

Name	Unknown
Reference	None
Type	Pin header (2.54mm, 10x2, male)

#	Name	Function	Connected to
1	C15	-	PC15
2	C14	-	PC14
3	A15	-	PA15
4	A14	-	PA14
5	A13	-	PA13
6	A12	-	PA12
7	A11	-	PA11
8	A10	-	PA10
9	A9	-	PA9
10	A8	-	PA8
11	A7	-	PA7
12	A6	-	PA6
13	A5	-	PA5
14	A4	-	PA4
15	A3	-	PA3
16	A2	-	PA2
17	A1	-	PA1
18	A0	-	PA0
19	3.3	-	+3.3V rail
20	GND	-	Ground plane

Name	Micro
Reference	None
Type	USB Micro

#	Name	Function	Connected to
1	-	VCC	+5V rail
2	-	D-	PA11 via 18Ω resistor
3	-	D+	PA12 via 18Ω resistor
4	-	ID	N.C.
5	-	GND	Ground plane

Name	SWD
Reference	None
Type	pin header (2.54mm, 4x1, male)

• Note: This is one header together with the UART1 header.

#	Name	Function	Connected to
1	GND	GND	Ground plane
2	CLK	SWCLK	PA14
3	DIO	SWDIO	PA13
4	3V3	VCC	+3.3V rail

Name	TF_Card
Reference	None
Type	microSD

#	Name	Function	Connected to
1	-	DAT2	N.C.
2	-	CD/DAT3	PA4 pulled up by 10kΩ resistor (R14)
3	-	CMD	PA7 pulled up by 10kΩ resistor (R15)
4	-	VDD	+3.3V rail
5	-	CLK	PA5
6	-	VSS	Ground plane
7	-	DAT0	PA6 pulled up by 10kΩ resistor (R16)
8	-	DAT1	N.C.
9	-	CD	N.C.
10	-	Body	Ground plane

Name	UART1
Reference	None
Type	pin header (2.54mm, 4x1, male)

• Note: This is one header together with the SWD header.

#	Name	Function	Connected to
1	GND	-	Ground plane
2	5V	-	+5V rail
3	RXD	-	PA10
4	TXD	-	PA9

Name	UART2
Reference	None
Type	pin header (2.54mm, 4x1, male)

#	Name	Function	Connected to
1	GND	-	Ground plane
2	5V	-	+5V rail
3	RXD	-	PA10
4	TXD	-	PA9

Name	NRF24L01
Reference	None
Type	Pin header (2.54mm, 4x2, female)

#	Name	Function	Connected to
1	-	GND	Ground plane
2	-	VCC	+3.3V rail
3	-	CE	PB0
4	-	CSN	PB2
5	-	SCK	PA5
6	-	MOSI	PA7
7	-	MISO	PA6
8	-	IRQ	PA15

Name	ESP8266
Reference	None
Type	Pin header (2.54mm, 4x2, female)

#	Name	Function	Connected to
1	-	RXD	PA2
2	-	NC	N.C.
3	-	NC	N.C.
4	-	GND	Ground plane
5	-	TXD	PA3
6	-	VCC	+3.3V rail
7	-	VCC	+3.3V rail
8	-	VCC	+3.3V rail

Name	OLED/TFT
Reference	None
Type	pin header (2.54mm, 8x1, female)

#	Name	Function	Connected to
1	-	-	PB11
2	-	-	PB9
3	-	-	PB7
4	-	-	PB5
5	-	-	PB3
6	-	-	PB1
7	-	-	+3.3V rail
8	-	-	Ground plane

Name	24C02
Reference	Unknown
Manufacturer	Unknown
Part	Generic EEPROM
Marking	Unknown
Datasheet	Unavailable
Package	SOP 8 pins
Description	Generic I2C EEPROM

#	Name	Function	Connected to
1	-	A0	Ground plane
2	-	A1	Ground plane
3	-	A2	Ground plane
4	-	GND	Ground plane
5	-	SDA	PB6
6	-	SCL	PB4
7	-	WP	Ground plane
8	-	VCC	+3.3V rail

Name	FLASH
Reference	Unknown
Manufacturer	Unknown
Part	Generic FLASH
Marking	Unknown
Datasheet	Unavailable
Package	SOIC 8 pins
Description	Generic Dual/Quad SPI FLASH

#	Name	Function	Connected to
1	-	/CS	PC13
2	-	DO	PA6
3	-	/WP	+3.3V rail
4	-	GND	Ground plane
5	-	DI	PA7
6	-	CLK	PA5
7	-	/HOLD	+3.3V rail
8	-	VCC	+3.3V rail