BPI-Bit

Introduction

Overview: BPI:bit

Overview: BPI:bit

The BPI Bit (also referred to as BPI-bit, stylised as bpi:bit) is an ESP32 with 32-bit Xtensa LX6 dual-core processor based embedded system. It supports Webduino, Arduino, MicroPython as well as Scratch X programming environments.

BPI:Bit board is 5x5 cm in size, weighs 10 ~ 12 grams, it houses a 20-Pin edge connector, built-in 25-full-color-LED lighting matrix, two photosensitive light sensors, two programmable buttons, an NTC resistor, a buzzer and a nine shaft sensor (triaxial acceleration Three-axis gyroscope and three-axis magnetic compass), the space configuration is as follows:

• Full color LED matrix: GPIO4
• Photosensitive sensor: GPIO36 (A0 left) GPIO39 (A3 right upper)
• Button switch : GPIO35 (A) GPIO27 (B)
• Temperature sensor: GPIO34 (A6)
• Buzzer: GPIO25
• MPU-9250 9-axis sensor: GPIO0,21,22,33.

BPI:bit hardware

BPI:bit hardware description

The board is 5 cm × 5 cm and has an ESP32 module with Xtensa 32bit LX6 dual-core processor, with a capacity of up to 600DMIPS, with a built-in 448KB ROM and 520 KB SRAM.accelerometer and magnetometer sensors,2.4G WiFI,Bluetooth and USB connectivity, a display consisting of 25 LEDs, two programmable buttons, and can be powered by either USB or an external battery pack.The device inputs and outputs are through five ring connectors that are part of the 23-pin edge connector.

BPI:bit provides a wide range of onboard resources, supports photosensitive sensor, digital triaxial sensor, digital compass, temperature sensor interface.Webduino:bit have 25 intelligent control LED light source that the control circuit and RGB chip are integrated in a package of 5050 components.Cascading port transmission signal by single line.Each pixel of the three primary color can achieve 256 brightness display, completed 16777216 color full color display, and scan frequency not less than 400Hz/s.

BPI:bit use MPU9250 onboard, MPU-9250 is a multi-chip module (MCM) consisting of two dies integrated into a single QFN package. One die houses the 3-Axis gyroscope and the 3-Axis accelerometer. The other die houses the AK8963 3-Axis magnetometer from Asahi Kasei Microdevices Corporation. Hence, the MPU-9250 is a 9-axis MotionTracking device that combines a 3-axis gyroscope, 3-axis accelerometer, 3-axis magnetometer and a Digital Motion Processor™ (DMP) all in a small 3x3x1mm package available as a pin-compatible upgrade from the MPU-6515. With its dedicated I2C sensor bus, the MPU-9250directly provides complete 9-axis MotionFusion™ output. The MPU-9250 MotionTracking device, with its 9-axis integration, on-chip MotionFusion™, and runtime calibration firmware, enables manufacturers to eliminate the costly and complex selection, qualification, and system level integration of discrete devices, guaranteeing optimal motion performance for consumers. MPU-9250 is also designed to interface with multiple non-inertial digital sensors, such as pressure sensors, on its auxiliary I²C port.

BPI:bit interface

BPI:bit PIN define

BPI:bit edge interface fully compatible micro:bit. so you can use micro:bit accessories on BPI:bit

HardWare PIN define of BPI:bit
Pin Name	Analog Function1	Analog Function2	Function1	Function2	Power
P3	ADC2_CH4		GPIO13
P0	ADC2_CH8	DAC_1	GPIO25
P4	ADC2_CH3		GPIO16
P5	ADC1_CH7		GPIO35
P6	ADC2_CH5		GPIO12
P7	ADC2_CH6		GPIO14
P1	ADC1_CH4		GPIO32
P8			GPIO16
P9			GPIO17
P10	ADC2_CH9	DAC_2	GPIO26
P11	ADC2_CH7		GPIO27
P12	ADC2_CH2		GPIO02
P2	ADC1_CH5		GPIO33
P13			GPIO18	SPI_SS
P14			GPIO19	SPI_SCK
P15			GPIO23	SPI_MISO
P16			GPIO05	SPI_MOSI
3V3					POWER:3V3
3V3					POWER:3V3
3V3					POWER:3V3
P19			GPIO22	I2C_SCL
P20			GPIO21	I2C_SDA
GND					GROUND
GND					GROUND
GND					GROUND

5*5 LED list

BPI:bit have 25 LEDs on board, it can be controlled with a single GPIO.

25 5*5 LED list of BPI:bit
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

MPU9250 9-axis sensor

The 9-axis sensor, MPU9250, is placed on the BPI:bit board. and MPU9250 uses I2C 0x69 address.

The 9-axis is the combination of 3 separate 3 axis sensors. For more detailed information of this chip, click here[1] to view the datasheet.

bpi:bit VS micro:bit

bpi:bit VS micro:bit
Module	bpi:bit	micro:bit
CPU	Dual-core 32bit Xtensa LX6, up to 240MHz	32bit ARM Cortex M0, up to 16MHz
RAM	520KB	256KB
ROM	448KB	Unkown
Flash	4MB	16KB
WIFI	802.11 b/g/n/e/i	N/A
Bluetooth	BT4.2 BR/EDR and BLE	BLE only
photosensitive sensor	2 light sensor	Basic light detection function on LEDs
temperature sensor	Stand along temperature sensor	On CPU chip temperature sensor
other senesor	MPU-9250 9-axis MotionTracking : 3-axis gyroscope, 3-axis accelerometer, 3-axis magnetometer	3-axis Accelerometer; 3-axis magnetometer
Buzzer	1x Buzzer	N/A
5*5 LEDS	25 intelligent-control full-color (16777216 color) LEDs, Cascading all LEDs by a single line.	25 red LEDs
25 GPIO	edge interface (compatible with most micro:bit I/O features)	edge interface
Button	2 programmable buttons	2 programmable buttons
micro USB	1x micro USB(UART)	1 x micro USB(Mass Storage Device)
Software	Webduino, Arduino, MicroPython, Scratch X	Microsoft MakeCode, MicroPython, Scratch X
Size	5*5 cm	5*4 cm

BPI-bit software

BPI:bit for webduino

About webduino

Webduino = WebComponents + Arduino

Webduino working principle:

• 1 use WebComponents integration Breakout.
• 2 use WebSocket(Firmata) to interacting with the server.
• 3 Server use TCP/IP(Firmata) to control webduino terminal.

Webduino project VS Arduino and micro:bit project

Webduino project VS Arduino and micro:bit project
item compared	Webduino	Arduino	Micro:bit
development language	HTML/JavaScript	C/C++	Python/JavaScript
development environment	WEB browser	Arduino IDE	JavaScript Blocks
Simulator	Webduino Simulator	Third-party support	Microsoft MakeCode
graphical programming	Wbduino blockly	Third-party Scratch	Blockly
Cloud Server	webduino cloud	N/A	N/A
attended mode	WiFi	USB	USB
Update the program	web online update	USB burn	USB disk

BPI:bit Webduino Blockly and simulator support

• Webduino Blockly and simulator

https://bit.webduino.com.cn/blockly/?lang=en

• Quick start Webduino Blockly and simulator

http://www.webduino.com.cn/site/zh_cn/docs/blockly.html

BPI:bit Webduino Cloud support

Webduino cloud platform provides your complete Internet of things services. You can update and operate various iot devices through platform management.

https://cloud.webduino.io

BPI:bit Webduino Firmware Burning

BPI:bit can be perfectly adapted to Webduino. Of course, before using it, we need to burn the Webduino firmware first.

Note: BPI:bit have burn webduino Firmware defaults. Only when you clear the factory Settings and use arduino open source, will you need to burn webduinofirmware again.

Firmware download address:Webduino for bpi:bit Firmware

Burning method:

There are two kinds of burning methods to choose from, we can use ESP Flash Download Tool to burn, we can also use the built-in Python script inside the PlatformIO to achieve burn.

One, ESP Flash Download Tool Tool download address:ESP Flash Download Tool

After downloading, unzip the archive and you will see an ESPFlashDownloadTool_v3.6.2.exe inside the folder. Open this shortcut and open an interface selection mode.

Select ESP32 DownloadTool:

Under `Download Path Config`, we need to select the four bin files that need to be burned and fill in the corresponding burn locations.

- File and burn position corresponding to：

File and burn position corresponding
set	file name	Position
1	bootloader_dio_40m.bin	0x1000
2	partitions.bin	0x8000
3	boot_app0.bin	0xe000
4	bit_default.bin	0x10000

- SpiFlashConfig：

SpiFlashConfig
1	SPI SPEED	40MHz
2	SPI MODE	DIO
3	FLASH SIZE	32Mbit
4	COM	COMx(Fill in the port number assigned by the computer)
5	BAUD	1152000

Normally, you do not need to burn two boot boot files. You can directly burn the firmware (bit_default.bin) and partitions (partitions.bin). If the bootloader is damaged, you can choose to burn along with bootloader_dio_40m.bin and boot_app0.bin. But be sure to pay attention to the settings below

`SpiFlashConfig` Please configure according to the software screenshot, and then select the port in the COM. Porter 115200 does not need to be changed. Select “START” to start recording.

During the burning process:

Finished:

After the burn is completed, you must reset or re-energize, and then you find the LED red light flashing, indicating that the burn is successful.

Burn time is about 20s

then you can use webduino all function on BPI:bit. Please see the webduino teaching documents

Second: PlatformIO comes with a script

This method needs to install PlatformIO in advance. Of course, if you are not using PlatformIO for development, you are advised to use the first method. This method is to disassemble the PlatformIO burning procedure.

First of all, you need to find the installation location of PlatformIO on your computer. For example, my installation location is as follows

Of course, your installation location is not necessarily the same as mine, you need to find it yourself.

Then, we can find a script file .platformio\packages\tool-esptoolpy\esptool.py according to the following path. This file is the script we need to burn. Then, we open the terminal of PlatformIO, or open the computer. Command line tool, enter the following code

Python ~\.platformio\packages\tool-esptoolpy\esptool.py --port COM19 --baud 115200 write_flash -fm dio -fs 4MB 0x010000 ~\BIT\bit_default.bin

The ~ in the above code needs to be replaced with your actual path, and then fill in the corresponding burning position in order, select the corresponding file path, and then execute this code. This method may be very specific for certain situations. Help, usually used at the time, it is recommended to use the first method of burning.

Normally, you do not need to burn two boot boot files. You can directly burn the firmware (bit_default.bin) and partitions (partitions.bin). If the bootloader is damaged, you can choose to burn along with bootloader_dio_40m.bin and boot_app0.bin. But be sure to pay attention to the settings below

BPI: bit Online tutorials

• tutorials : http://www.webduino.com.cn/site/zh_cn/tutorials.html

BPI:bit for arduino

Arduino IDE

• How to use with Arduino IDE

microPyhton

• uPyCraft（microPyhton)

How to test 9 axis sensor-MPU9250

• code update to github : https://github.com/yelvlab/BPI-BIT/tree/master/Code/MPU9250

The following is the result of the return of the serial port

Resources

Source code

• BPI:bit for webduino source code on github: https://github.com/webduinoio

• BPI:bit for arduino Source code on Github: https://github.com/yelvlab/BPI-BIT

documents

• BPI:bit schematic diagram : https://github.com/yelvlab/BPI-BIT/blob/master/doc/BPI-WEBDUINO-BIT-V1_2-20180417.pdf
• BPI:bit user manual ： https://github.com/yelvlab/BPI-BIT/blob/master/doc/BPI-bit_user_manual.pdf
• BPI:bit dxf file : http://forum.banana-pi.org/uploads/default/original/2X/0/0b86ccaeb565cdeef093164fd1ff837727ca2887.rar
• ESP32 datasheet: https://github.com/yelvlab/BPI-BIT/blob/master/doc/ESP32-datesheet_english.pdf
• MPU9250 datasheet:http://www.invensense.com/wp-content/uploads/2015/02/PS-MPU-9250A-01-v1.1.pdf
• More others ： https://github.com/yelvlab/BPI-BIT/tree/master/doc
• Taiwan server : http://webuino.io
• Overworld server: http://webduino.io
• china mainland : http://www.webduino.com.cn
• Easy to buy BPI:bit sample form aliexpress
• Facebook group