BPI-Bit

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Introduction

Overview: BPI:bit
Overview: BPI:bit

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

BPI:Bit development board 5 cm width 5 cm long, weighs about 10 ~ 12 grams, in addition to below 20 Pin goldfinger interface, a built-in a 25 full-color LED lighting matrix, two photosensitive resistance button switch a temperature sensing resistor A buzzer and a nine shaft sensor (triaxial acceleration Three-axis gyroscope and three-axis magnetic compass), space configuration is as follows:

  • Full color LED matrix :4
  • photosensitive sensor :36 (A0 left) 39 (A3 right upper)
  • button switch :35 (A) 27 (B)
  • temperature sensor :34 (A6)
  • buzzer: 25
  • 9 axis sensor mpu-9250:21,22.

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 interfact.JPG

BPI:bit edge interface

File:BPI bit edge pin define.png

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 ,you can control it with 1 GPIO . easy to use it.

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

A powerful 9 axis sensor, MPU9250, is placed on the BPI:bit board. and MPU9250 use I2C 0x69 address.

The 9 axis here is different from the 9 axis of space understanding, and is actually the combination of 3 separate 3 axis sensors (accelerometers - Accelerator, gyroscope - Gyroscope, magnetometer - Magnetometer). For the detailed introduction of this chip, you can visit GitHub to see the document:

https://github.com/yelvlab/BPI-BIT/tree/master/doc

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.png

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 1.png

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

Blockly en wiki .png

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.

Webduino burn 1.png

Select ESP32 DownloadTool:

Webduino burn 2.jpg

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:

Webduino burn 3.jpg

Finished:

Webduino burn 4.jpg

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

Platformio.png

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

BPI:bit for arduino

Arduino IDE

microPyhton

Scratch

How to test 9 axis sensor-MPU9250

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

Mpu9250.jpg

Resources

Source code

documents

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