Micro Bit Development Board Programming STEM Maker Education DIY Controller Board

I used nRF51822 processor based on ARM Cortex-M0, integrated Bluetooth function, onboard 5x5 LED dot matrix, two programmable buttons, accelerometer, three-axis geomagnetic and thermometer and other resources.
I also introduced a 20+5pin extension interface, which can easily be used for various programming-related teaching and development scenarios, including programming video games, robot control, scientific experiments, and wearable device development;
I'm only half the size of a credit card (4cm x 5cm), and you can integrate me into many portable projects.
In terms of software, I support the PXT graphical programming interface developed by Microsoft: Support Windows, macOS, iOS, Android and other operating systems; The programming environment is based on web services, no additional compiler downloads are required; Computer programming and emulation program via USB; The mobile terminal wirelessly writes and emulates the program through Bluetooth; I also support Javasript, Phython, Mbed C

A variety of mainstream programming languages:
Microsoft TouchDevelop IDE
Microsoft Blocks
CodeKingdoms Javascript
MicroPython
mbed enabled
In terms of hardware, my parameters are as follows:
Nordic nRF51822Freescale KL26Z - 48 MHz ARM Cortex-M0+ core microcontroller
16 MHz 32-bit ARM Cortex-M0 microcontroller
Bluetooth® 4.0 low energy/2.4GHz RF SoC
16kB RAM
256kB Flash
Compass - Freescale MAG3110 3-axis Geomagnetic Sensor, I2C Interface
Accelerometer - Freescale MMA8652 3-axis accelerometer, I2C interface
Power connector - 3V power supply interface
Reset button - reset button
Micro-USB connector - Micro-USB interface, used to access computer programming, emulation programs, serial communication, etc.
5x5 LED display - 5x5 LED dot matrix, can display text, graphics, etc.
Button A/B - Programmable buttons
I/O connection pins - I/O expansion interface, 20+5 expansion pins (including SPI, UART, I2C, Analog, PWM and other functions
Colour: black blue
Material: PCB

Package Contents:
1 x development board

Only the above package content, other products are not included.
Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.