Development Board Introduction

2023-11-01

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

IO is compatible with micro:bit and can use most peripheral accessories of micro:bit.

Support Webduino, Arduino, MicroPython & CircuitPython 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

Diagram

Hardware Specifications

Features Specs
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

On-board peripherals GPIO Signal type
Photosensitive sensor(L) GPIO 12 Analog Input
Photosensitive sensor(R) GPIO 13 Analog Input
Key A GPIO 38 Digital Input
Key B GPIO 33 Digital Input
Key BOOT GPIO 0 Digital Input
Thermistor sensor GPIO 14 Analog Input
Buzzer GPIO 17 PWM(Digital Output)
RGB_LED 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.
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

SPI and I2C preset pins

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.

Resources