Difference between revisions of "Micropython"

Revision as of 09:45, 2 February 2020

Micropython is a hype!

Micropython is a programming language for microcontrollers, like C, C++, Java, Code Blocks.

In principle all the languages can do the same sort of thing. In principle all languages have the same type of complexity.

Why MicroPython???? Micropython can be seen as "a conversation with the microcontroller".

You can send it command using code, and it will immediately talk back. You can change a line of code in a program and the change is immediately incorporated.

So you can test sensors directly. Look at the values coming out of the sensor without a program.

Maybe this is why everybody wants micropython, why it seems to be a hype.

Micropython needs disk space on the microcontroller (or around on the board): 60K

Arduino

The Arduino doesn't "talk" micropython. Its memory is too small.

You can also say: Micropython is too big!

Uploading to the ATmega328, or comparable always cost time, even for the slightest change in code: compiling and flashing. The memory is always first erased, before putting the new code in.

The code stays on the board.

The file is nicely saved in the Arduino Sketch folder

Micropython - circuit python

Officiel versions http://micropython.org https://circuitpython.org

Adafruit version: https://www.adafruit.com/micropython

Sparkfun version: https://learn.sparkfun.com/tutorials/micropython-programming-tutorial-getting-started-with-the-esp32-thing/all

The program is not always saved on the microcontrollers. It is when you drag the file into the disk visible in your laptop.

In the MAIX dock editor you have to specifically tell the editor to store the code on the microcontroller.

Editors

Online code editor in python for the BBC Microbit: in Chrome (not in Safari or Firefox): https://python.microbit.org/v/2.0. Errors are displayed on the microbit.

Mu editor for Adafruit, also microbit https://codewith.mu Errors are displayed in the REPL window.

The MAIX dock has its own editor: https://maixpy.sipeed.com/en/

OpenMV has its own editor: https://openmv.io

You can also use a text editor and drag the file into the micropython disk

Microcontrollers talking micropython (or CircuitPython)

I have bought and tested these boards myself.

(prices for Dutch shops, Antratek.nl, KIWI-electronics)

Adafruit circuit playground express (29,95) https://www.adafruit.com/product/3333
Adafruit feather M0 adalogger (22,93 euro) https://learn.adafruit.com/adafruit-feather-m0-adalogger/
Adafruit Itsy Bitsy M0 (12,04 euro)
Adafruit Itsy bitsy M4 express (15,70 euro) https://learn.adafruit.com/introducing-adafruit-itsybitsy-m4
Adafruit Trinket M0 (8,40 euro) https://circuitpython.org/board/trinket_m0/

Maix Dock one (30,95) https://www.antratek.nl/sipeed-m1w-ai-dev-board-with-lcd-and-camera
BBC Microbit (22,95) https://www.floris.cc/shop/en/home/1848-microbit-go-bundel-microbit.html
OpenMV7 (75 euro) https://www.antratek.nl/openmv-h7-camera, https://openmv.io

Sparkfun Artemis Thing Plus (25,35) https://www.antratek.nl/artemis-thing-plus
Sparkfun Artemis Nano (19,30) https://www.antratek.nl/redboard-artemis-nano

Sparkfun Edge (18,09) https://www.antratek.nl/edge-development-board-apollo3-blue

All these boards can also be programmed using the Arduino IDE, except for the microbit

Memory space

Micropython asks for memory space.

For example the Adafruit Feather M0 and the Adafruit Trinket M0 have only a little bit of space.

When you load too many libraries on the micro python "disk", you get this error:

This means that for a real micropython program two sensors can be too much, while if you program the same thing in Arduino IDE on these boards it only is 22% of the memory space.

These two images are for the same purpose: connecting a BME680 and a LIS3DH sensor to the Feather M0 datalogger.

Adafruit Itsy Bitsy M0, Adafruit Itsy Bitsy M4, Adafruit Itsy bitsy M4 express, have 2MB.

With these last boards you can add two sensors without any problem.

Sensors

For Arduino finding the library for the sensors is easy.

Micropython libraries for Adafruit boards: https://learn.adafruit.com/welcome-to-circuitpython/circuitpython-libraries

I have used these libraries also for Sparkfun sensors if the sensor type is the same, for instance the LIS3DH.

Special Boards

Because the disk space must be bigger anyway, the boards come with extensions, like LCD screens and camera's, or extra programming facilities like micro AI: TensorFlow.

MAIX Dock has a mic array, a ring of six microphone and neopixels, which can indicate the direction of the sound: https://www.seeedstudio.com/Sipeed-6-1-Microphone-Array-for-Dock-Go-Bit-p-2875.html

At the same time the display which comes with the MAIX Dock displays also the direction of the sound: https://www.flickr.com/photos/contrechoc/49403059642/in/dateposted/

The Adafruit Circuit Express comes with 8 neopixels and a microphone, acceleration sensor.

The BBC Microbit comes with a 5 x 5 pixel display, acceleration sensor, temperature sensor, BLE.

The Sparkfun Edge comes with tensor flow. It can do speech recognition, although the results are poor...

These advanced boards - compared to the Arduino board with only the built in LED 13 are really different personalities, they can do different things, have different built in possibilities.

More about special boards on this page SpecialBoards - talking about boards independent of the language.

Other languages

Of course there are also other way to program these boards, Arduino IDE was already mentioned.

BBC Microbit can also be programmed in C++ using the online embed editor: https://ide.mbed.com/compiler/#nav:/microbit-proximity-heart/main.cpp

BBC Microbit and Adafruit Circuit Express can be programmed using the online Code block Editor: https://makecode.adafruit.com/#editor