About BPI-Bit-S2

BPI-Bit-S2 with ESP32-S2

BPI-Bit with ESP32

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BPI-UNO32 with ESP32 design

BPI-Bit-S2 development board is a successor to BPI:Bit, inheriting most of the core hardware functions.

Support Webduino, Arduino, MicroPython programming environment suitable for STEAM education.

Key features

ESP32-S2
5x5 RGB LED matrix
1 buzzer
1 thermistor sensor
2 photosensitive sensors
2 Programmable keys,1 BOOT key,1 Reset key
Type-C USB interface
Size 5x5cm
The Goldfinger Edge Connector definition is fully compatible with Micro: Bit

Hardware upgrade and function comparison

BPI:Bit VS BPI-Bit-S2
Module	BPI:Bit	BPI-Bit-S2
MCU	ESP32	ESP32-S2
ROM	448 KB	128 KB
RAM	520 KB	320 KB
FlASH ROM	4096 KB	4096 KB
PSRAM	None	2048 KB
Wireless Capability	WIFI,Bluetooth	WIFI
LED	25 WS2812-5050 RGB LED	25 WS2812-3535 RGB LED
Key	2 programmable keys，1 RST key	2 programmable keys，1 BOOT key，1 RST key
Buzzer	5.3x5.3mm buzzer	8.5x8.5mm buzzer
USB interface	Micro USB	Type-C USB
USB to TTL	support	None
Battery socket	support	None
IO	19 pin Goldfinger IO	19 pin Goldfinger IO
Nine-axis sensor	support	None
Photosensitive sensor	2	2
Thermistor sensor	1	1

Hardware interface

BPI-Bit-S2 specification
MCU	ESP32-S2FN4R2，Xtensa® 32 bit LX7 Single-Core Processer
Frequency	240MHz MAX
operating temperature	-40℃~+85℃
ROM	128 KB
SRAM	320 KB
FLASH ROM	4 MB
PSRAM	2 MB
WIFI	IEEE 802.11 b/g/n ，2.4Ghz
GPIO	19 available GPIO pins have been introduced
Peripheral functions	ADC,TOUCH,PWM,SPI,I2C,I2S,Pulse counter, RMT,TWAI® Controller,SD/MMC,LCD_CAMERA
External crystal	40Mhz
Buzzer	8.5x8.5mm buzzer
LED	25 WS2812 rgb LED, single line GPIO control; 1 monochrome LED, controlled by GPIO0
Photosensitive sensor	2 photosensitive sensor
Thermistor sensor	1 thermistor sensor
IO	19 pins Goldfinger IO,19 pins contacts on the back
Key	2 Programmable keys,1 BOOT key,1 Reset key
USB	USB Type-C interface，full speed USB OTG,USB-ACM
Operating voltage	3.3V
Power	USB Type-C input 5V，or Goldfinger IO input 3.3V power supply
Size	5 * 5 cm

On-board peripherals

Peripheral GPIO allocation and signal type
Photosensitive sensor(L)	GPIO 12	Analog Input
Photosensitive sensor(R)	GPIO 13	Analog Input
Thermistor sensor	GPIO 14	Analog Input
Key A	GPIO 38	Digital Input
Key B	GPIO 33	Digital Input
Key BOOT	GPIO 0	Digital Input
Buzzer	GPIO 17	PWM(Digital Output)
RGB LEDs	GPIO 18	Digital Output

5*5 RGB LED

BPI-Bit-S2 have 25 WS2812 full color RGB LED, single GPIO ontrol.The three primary color pixels of each LED can achieve 8bit 256 level brightness display, and achieve 16777216 color full color display, scanning frequency is not less than 400Hz/s.

5*5 LEDs list of BPI-Bit-S2
20	15	10	5	0
21	16	11	6	1
22	17	12	7	2
23	18	13	8	3
24	19	14	9	4

Goldfinger GPIO define

BPI-Bit-S2 Gold finger GPIO is defined to be compatible with Micro:Bit. GPIO expansion board accessories can be used with Micro: Bit.

SPI,I2C
Function	Pin Name	GPIO Num
SPI_SCK	P13	GPIO36
SPI_MISO	P14	GPIO37
SPI_MOSI	P15	GPIO35
SPI_CS	P16	GPIO34
I2C_SCL	P19	GPIO16
I2C_SDA	P20	GPIO15

Power

BPI-Bit-S2 supports two power supply modes

1. Type-C USB：Use USB cable power supply, connect USB interface of computer or other 5V USB charger to power the development board.

2. Gold finger: At the bottom of the development board, the gold finger contains a power interface with both input and output functions. It uses 3.3V power supply, positive terminal is connected to 3V3, and negative terminal is connected to GND.